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nanomechanical resonator</title> <meta name="description" content="Search results for: nanomechanical resonator"> <meta name="keywords" content="nanomechanical resonator"> <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=no"> <meta charset="utf-8"> <link href="https://cdn.waset.org/favicon.ico" type="image/x-icon" rel="shortcut icon"> <link href="https://cdn.waset.org/static/plugins/bootstrap-4.2.1/css/bootstrap.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/plugins/fontawesome/css/all.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/css/site.css?v=150220211555" rel="stylesheet"> </head> <body> <header> <div class="container"> <nav class="navbar navbar-expand-lg navbar-light"> <a class="navbar-brand" href="https://waset.org"> <img src="https://cdn.waset.org/static/images/wasetc.png" alt="Open Science Research Excellence" title="Open Science Research Excellence" /> </a> <button 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action="https://publications.waset.org/abstracts/search"> <div id="custom-search-input"> <div class="input-group"> <i class="fas fa-search"></i> <input type="text" class="search-query" name="q" placeholder="Author, Title, Abstract, Keywords" value="nanomechanical resonator"> <input type="submit" class="btn_search" value="Search"> </div> </div> </form> </div> </div> <div class="row mt-3"> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Commenced</strong> in January 2007</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Frequency:</strong> Monthly</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Edition:</strong> International</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Paper Count:</strong> 83</div> </div> </div> </div> <h1 class="mt-3 mb-3 text-center" style="font-size:1.6rem;">Search results for: nanomechanical resonator</h1> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">83</span> High Frequency Nanomechanical Oscillators Based on Synthetic Nanowires</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Minjin%20Kim">Minjin Kim</a>, <a href="https://publications.waset.org/abstracts/search?q=Jihwan%20Kim"> Jihwan Kim</a>, <a href="https://publications.waset.org/abstracts/search?q=Bongsoo%20Kim"> Bongsoo Kim</a>, <a href="https://publications.waset.org/abstracts/search?q=Junho%20Suh"> Junho Suh</a> </p> <p class="card-text"><strong>Abstract:</strong></p> We demonstrate nanomechanical resonators constructed with synthetic nanowires (NWs) and study their electro-mechanical properties at millikelvin temperatures. Nanomechanical resonators are fabricated using single-crystalline Au NWs and InAs NWs. The mechanical resonance signals are acquired by either magnetomotive or capacitive detection methods. The Au NWs are synthesized by chemical vapor transport method at 1100 °C, and they exhibit clean surface and single-crystallinity with little defects. Due to pristine surface quality, these Au NW mechanical resonators could provide an ideal model system for studying surface-related effects on the mechanical systems. The InAs NWs are synthesized by molecular beam epitaxy or metal organic chemical vapor deposition method. The InAs NWs show electronic conductance modulation resembling Coulomb blockade, which also manifests in the mechanical resonance signals in the form of damping and resonance frequency shift. Our result provides an evidence of strong electro-mechanical coupling in synthetic NW nanomechanical resonators. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Au%20nanowire" title="Au nanowire">Au nanowire</a>, <a href="https://publications.waset.org/abstracts/search?q=InAs%20nanowire" title=" InAs nanowire"> InAs nanowire</a>, <a href="https://publications.waset.org/abstracts/search?q=nanomechanical%20resonator" title=" nanomechanical resonator"> nanomechanical resonator</a>, <a href="https://publications.waset.org/abstracts/search?q=synthetic%20nanowires" title=" synthetic nanowires"> synthetic nanowires</a> </p> <a href="https://publications.waset.org/abstracts/66256/high-frequency-nanomechanical-oscillators-based-on-synthetic-nanowires" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/66256.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">210</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">82</span> Mixed Frequency Excitation of an Electrostatically Actuated Resonator </h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Abdallah%20H.%20Ramini">Abdallah H. Ramini</a>, <a href="https://publications.waset.org/abstracts/search?q=Alwathiqbellah%20I.%20Ibrahim"> Alwathiqbellah I. Ibrahim</a>, <a href="https://publications.waset.org/abstracts/search?q=Mohammad%20I.%20Younis"> Mohammad I. Younis</a> </p> <p class="card-text"><strong>Abstract:</strong></p> We investigate experimentally and theoretically the dynamics of a capacitive resonator under mixed frequency excitation of two AC harmonic signals. The resonator is composed of a proof mass suspended by two cantilever beams. Experimental measurements are conducted using a laser Doppler Vibrometer to reveal the interesting dynamics of the system when subjected to two-source excitation. A nonlinear single-degree-of-freedom model is used for the theoretical investigation. The results reveal combination resonances of additive and subtractive type, which are shown to be promising to increase the bandwidth of the resonator near primary resonance frequency. Our results also demonstrate the ability to shift the combination resonances to much lower or much higher frequency ranges. We also demonstrate the dynamic pull-in instability under mixed frequency excitation. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=electrostatically%20actuated%20resonator" title="electrostatically actuated resonator">electrostatically actuated resonator</a>, <a href="https://publications.waset.org/abstracts/search?q=multi-frequency%20excitation" title=" multi-frequency excitation"> multi-frequency excitation</a>, <a href="https://publications.waset.org/abstracts/search?q=nonlinear%20dynamics" title=" nonlinear dynamics"> nonlinear dynamics</a>, <a href="https://publications.waset.org/abstracts/search?q=AC%20harmonic%20signals" title=" AC harmonic signals"> AC harmonic signals</a> </p> <a href="https://publications.waset.org/abstracts/22118/mixed-frequency-excitation-of-an-electrostatically-actuated-resonator" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/22118.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">622</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">81</span> Genetic Algorithm Optimization of Microcantilever Based Resonator</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Manjula%20Sutagundar">Manjula Sutagundar</a>, <a href="https://publications.waset.org/abstracts/search?q=B.%20G.%20Sheeparamatti"> B. G. Sheeparamatti</a>, <a href="https://publications.waset.org/abstracts/search?q=D.%20S.%20Jangamshetti"> D. S. Jangamshetti</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Micro Electro Mechanical Systems (MEMS) resonators have shown the potential of replacing quartz crystal technology for sensing and high frequency signal processing applications because of inherent advantages like small size, high quality factor, low cost, compatibility with integrated circuit chips. This paper presents the optimization and modelling and simulation of the optimized micro cantilever resonator. The objective of the work is to optimize the dimensions of a micro cantilever resonator for a specified range of resonant frequency and specific quality factor. Optimization is carried out using genetic algorithm. The genetic algorithm is implemented using MATLAB. The micro cantilever resonator is modelled in CoventorWare using the optimized dimensions obtained from genetic algorithm. The modeled cantilever is analysed for resonance frequency. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=MEMS%20resonator" title="MEMS resonator">MEMS resonator</a>, <a href="https://publications.waset.org/abstracts/search?q=genetic%20algorithm" title=" genetic algorithm"> genetic algorithm</a>, <a href="https://publications.waset.org/abstracts/search?q=modelling%20and%20simulation" title=" modelling and simulation"> modelling and simulation</a>, <a href="https://publications.waset.org/abstracts/search?q=optimization" title=" optimization"> optimization</a> </p> <a href="https://publications.waset.org/abstracts/2591/genetic-algorithm-optimization-of-microcantilever-based-resonator" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/2591.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">550</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">80</span> Study of a Fabry-Perot Resonator</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=F.%20Hadjaj">F. Hadjaj</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20Belghachi"> A. Belghachi</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20Halmaoui"> A. Halmaoui</a>, <a href="https://publications.waset.org/abstracts/search?q=M.%20Belhadj"> M. Belhadj</a>, <a href="https://publications.waset.org/abstracts/search?q=H.%20Mazouz"> H. Mazouz</a> </p> <p class="card-text"><strong>Abstract:</strong></p> A laser is essentially an optical oscillator consisting of a resonant cavity, an amplifying medium and a pumping source. In semiconductor diode lasers, the cavity is created by the boundary between the cleaved face of the semiconductor crystal and air and also has reflective properties as a result of the differing refractive indices of the two media. For a GaAs-air interface a reflectance of 0.3 is typical and therefore the length of the semiconductor junction forms the resonant cavity. To prevent light, being emitted in unwanted directions from the junction and Sides perpendicular to the required direction are roughened. The objective of this work is to simulate the optical resonator Fabry-Perot and explore its main characteristics, such as FSR, Finesse, Linewidth, Transmission and so on that describe the performance of resonator. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Fabry-Perot%20Resonator" title="Fabry-Perot Resonator">Fabry-Perot Resonator</a>, <a href="https://publications.waset.org/abstracts/search?q=laser%20diod" title=" laser diod"> laser diod</a>, <a href="https://publications.waset.org/abstracts/search?q=reflectance" title=" reflectance"> reflectance</a>, <a href="https://publications.waset.org/abstracts/search?q=semiconductor" title=" semiconductor "> semiconductor </a> </p> <a href="https://publications.waset.org/abstracts/4422/study-of-a-fabry-perot-resonator" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/4422.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">352</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">79</span> Nanomechanical Properties of Coconut Shell Ash Blended Cement Mortar</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Kumator%20Taku">Kumator Taku</a>, <a href="https://publications.waset.org/abstracts/search?q=Bilkisu%20Amartey"> Bilkisu Amartey</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This research used Grid indentation technique to investigate the effect of the addition of Coconut Shell Ash (CSA) on the nanomechanical properties of the main phases of the hydrated cement paste. Portland cement was partially replaced with 15% CSA at a water-binder ratio of 0.5 and cubes casted and cured for 28 days after which they were polished to reduce surface roughness to the barest minimum. The result of nanoindentation shows that addition of 15% CSA to cement paste transforms portlandite to C-S-H by the pozzolanic reaction. More so, there is reduced porosity and a reduction in the volume of CH by the addition of the CSA. Even though the addition of 15% CSA does not drastically change the average values of the hardness and elastic modulus of the two phases of the C-S-H, it greatly modifies their relative proportions, leading to the production of more HD C-S-H. Overall, incorporating 15%CSA to cement mortar improves the Nanomechanical properties of the four main phases of the hydrated cement paste. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Coconut%20Shell%20Ash" title="Coconut Shell Ash">Coconut Shell Ash</a>, <a href="https://publications.waset.org/abstracts/search?q=Elastic%20Modulus" title=" Elastic Modulus"> Elastic Modulus</a>, <a href="https://publications.waset.org/abstracts/search?q=Hardness" title=" Hardness"> Hardness</a>, <a href="https://publications.waset.org/abstracts/search?q=Nanoindentation" title=" Nanoindentation"> Nanoindentation</a>, <a href="https://publications.waset.org/abstracts/search?q=Porosity" title=" Porosity"> Porosity</a> </p> <a href="https://publications.waset.org/abstracts/122927/nanomechanical-properties-of-coconut-shell-ash-blended-cement-mortar" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/122927.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">129</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">78</span> Breakdown Voltage Measurement of High Voltage Transformers Oils Using an Active Microwave Resonator Sensor</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Ahmed%20A.%20Al-Mudhafar">Ahmed A. Al-Mudhafar</a>, <a href="https://publications.waset.org/abstracts/search?q=Ali%20A.%20Abduljabar"> Ali A. Abduljabar</a>, <a href="https://publications.waset.org/abstracts/search?q=Hayder%20Jawad%20Albattat"> Hayder Jawad Albattat</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This work suggests a new microwave resonator sensor (MRS) device for measuring the oil’s breakdown voltage of high voltage transformers. A precise high-sensitivity sensor is designed and manufactured based on a microstrip split ring resonator (SRR). To improve the sensor sensitivity, a RF amplifier of 30 dB gain is linked through a transmission line of 50Ω.The sensor operates at a microwave band (L) with a quality factor of 1.35x105 when it is loaded with an empty tube. In this work, the sensor has been tested with three samples of high voltage transformer oil of different ages (new, middle, and damaged) where the quality factor differs with each sample. A mathematical model was built to calculate the breakdown voltage of the transformer oils and the accuracy of the results was higher than 90%. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=active%20resonator%20sensor" title="active resonator sensor">active resonator sensor</a>, <a href="https://publications.waset.org/abstracts/search?q=oil%20breakdown%20voltage" title=" oil breakdown voltage"> oil breakdown voltage</a>, <a href="https://publications.waset.org/abstracts/search?q=transformers%20oils" title=" transformers oils"> transformers oils</a>, <a href="https://publications.waset.org/abstracts/search?q=quality%20factor" title=" quality factor"> quality factor</a> </p> <a href="https://publications.waset.org/abstracts/157297/breakdown-voltage-measurement-of-high-voltage-transformers-oils-using-an-active-microwave-resonator-sensor" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/157297.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">269</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">77</span> Increasing of Gain in Unstable Thin Disk Resonator </h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=M.%20Asl.%20Dehghan">M. Asl. Dehghan</a>, <a href="https://publications.waset.org/abstracts/search?q=M.%20H.%20Daemi"> M. H. Daemi</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20Radmard"> S. Radmard</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20H.%20Nabavi"> S. H. Nabavi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Thin disk lasers are engineered for efficient thermal cooling and exhibit superior performance for this task. However the disk thickness and large pumped area make the use of this gain format in a resonator difficult when constructing a single-mode laser. Choosing an unstable resonator design is beneficial for this purpose. On the other hand, the low gain medium restricts the application of unstable resonators to low magnifications and therefore to a poor beam quality. A promising idea to enable the application of unstable resonators to wide aperture, low gain lasers is to couple a fraction of the out coupled radiation back into the resonator. The output coupling gets dependent on the ratio of the back reflection and can be adjusted independently from the magnification. The excitation of the converging wave can be done by the use of an external reflector. The resonator performance is numerically predicted. First of all the threshold condition of linear, V and 2V shape resonator is investigated. Results show that the maximum magnification is 1.066 that is very low for high quality purposes. Inserting an additional reflector covers the low gain. The reflectivity and the related magnification of a 350 micron Yb:YAG disk are calculated. The theoretical model was based on the coupled Kirchhoff integrals and solved numerically by the Fox and Li algorithm. Results show that with back reflection mechanism in combination with increasing the number of beam incidents on disk, high gain and high magnification can occur. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=unstable%20resonators" title="unstable resonators">unstable resonators</a>, <a href="https://publications.waset.org/abstracts/search?q=thin%20disk%20lasers" title=" thin disk lasers"> thin disk lasers</a>, <a href="https://publications.waset.org/abstracts/search?q=gain" title=" gain"> gain</a>, <a href="https://publications.waset.org/abstracts/search?q=external%20reflector" title=" external reflector"> external reflector</a> </p> <a href="https://publications.waset.org/abstracts/34584/increasing-of-gain-in-unstable-thin-disk-resonator" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/34584.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">412</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">76</span> Designing and Analyzing Sensor and Actuator of a Nano/Micro-System for Fatigue and Fracture Characterization of Nanomaterials</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Mohammad%20Reza%20Zamani%20Kouhpanji">Mohammad Reza Zamani Kouhpanji</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This paper presents a MEMS/NEMS device for fatigue and fracture characterization of nanomaterials. This device can apply static loads, cyclic loads, and their combinations in nanomechanical experiments. It is based on the electromagnetic force induced between paired parallel wires carrying electrical currents. Using this concept, the actuator and sensor parts of the device were designed and analyzed while considering the practical limitations. Since the PWCC device only uses two wires for actuation part and sensing part, its fabrication process is extremely easier than the available MEMS/NEMS devices. The total gain and phase shift of the MEMS/NEMS device were calculated and investigated. Furthermore, the maximum gain and sensitivity of the MEMS/NEMS device were studied to demonstrate the capability and usability of the device for wide range of nanomaterials samples. This device can be readily integrated into SEM/TEM instruments to provide real time study of the mechanical behaviors of nanomaterials as well as their fatigue and fracture properties, softening or hardening behaviors, and initiation and propagation of nanocracks. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=sensors%20and%20actuators" title="sensors and actuators">sensors and actuators</a>, <a href="https://publications.waset.org/abstracts/search?q=MEMS%2FNEMS%20devices" title=" MEMS/NEMS devices"> MEMS/NEMS devices</a>, <a href="https://publications.waset.org/abstracts/search?q=fatigue%20and%20fracture%20nanomechanical%20testing%20device" title=" fatigue and fracture nanomechanical testing device"> fatigue and fracture nanomechanical testing device</a>, <a href="https://publications.waset.org/abstracts/search?q=static%20and%20cyclic%20nanomechanical%20testing%20device" title=" static and cyclic nanomechanical testing device"> static and cyclic nanomechanical testing device</a> </p> <a href="https://publications.waset.org/abstracts/78711/designing-and-analyzing-sensor-and-actuator-of-a-nanomicro-system-for-fatigue-and-fracture-characterization-of-nanomaterials" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/78711.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">297</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">75</span> Complementary Split Ring Resonator-Loaded Microstrip Patch Antenna Useful for Microwave Communication</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Subal%20Kar">Subal Kar</a>, <a href="https://publications.waset.org/abstracts/search?q=Madhuja%20Ghosh"> Madhuja Ghosh</a>, <a href="https://publications.waset.org/abstracts/search?q=Amitesh%20Kumar"> Amitesh Kumar</a>, <a href="https://publications.waset.org/abstracts/search?q=Arijit%20Majumder"> Arijit Majumder</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Complementary split-ring resonator (CSRR) loaded microstrip square patch antenna has been optimally designed with the help of high frequency structure simulator (HFSS). The antenna has been fabricated on the basis of the simulation design data and experimentally tested in anechoic chamber to evaluate its gain, bandwidth, efficiency and polarization characteristics. The CSRR loaded microstrip patch antenna has been found to realize significant size miniaturization (to the extent of 24%) compared to the conventional-type microstrip patch antenna both operating at the same frequency (5.2 GHz). The fabricated antenna could realize a maximum gain of 4.17 dB, 10 dB impedance bandwidth of 34 MHz, efficiency 50.73% and with maximum cross-pol of 10.56 dB down at the operating frequency. This practically designed antenna with its miniaturized size is expected to be useful for airborne and space borne applications at microwave frequency. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=split%20ring%20resonator" title="split ring resonator">split ring resonator</a>, <a href="https://publications.waset.org/abstracts/search?q=metamaterial" title=" metamaterial"> metamaterial</a>, <a href="https://publications.waset.org/abstracts/search?q=CSRR%20loaded%20patch%20antenna" title=" CSRR loaded patch antenna"> CSRR loaded patch antenna</a>, <a href="https://publications.waset.org/abstracts/search?q=microstrip%20patch%20antenna" title=" microstrip patch antenna"> microstrip patch antenna</a>, <a href="https://publications.waset.org/abstracts/search?q=LC%20resonator" title=" LC resonator"> LC resonator</a> </p> <a href="https://publications.waset.org/abstracts/52176/complementary-split-ring-resonator-loaded-microstrip-patch-antenna-useful-for-microwave-communication" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/52176.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">359</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">74</span> Band Gap Tuning Based on Adjustable Stiffness of Local ‎Resonators ‎</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Hossein%20Alimohammadi">Hossein Alimohammadi</a>, <a href="https://publications.waset.org/abstracts/search?q=Kristina%20Vassiljeva"> Kristina Vassiljeva</a>, <a href="https://publications.waset.org/abstracts/search?q=Hassan%20HosseinNia"> Hassan HosseinNia</a>, <a href="https://publications.waset.org/abstracts/search?q=Eduard%20Petlenkov"> Eduard Petlenkov</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This research article discusses the mechanisms for bandgap tuning of beam-type resonators to achieve ‎broadband vibration suppression through adjustable stiffness. The method involves changing the center of ‎mass of the cantilever-type resonator to achieve piezo-free tuning of stiffness. The study investigates the ‎effect of the center of masses variation (δ) of attached masses on the bandgap and vibration suppression ‎performance of a non-uniform beam-type resonator within a phononic structure. The results suggest that the ‎cantilever-type resonator beam can be used to achieve tunability and real-time control and indicate that ‎varying δ significantly impacts the bandgap and transmittance response. Additionally, the research explores ‎the use of the first and second modes of resonators for tunability and real-time control. These findings examine ‎the feasibility of this approach, demonstrate the potential for improving resonator performance, and provide ‎insights into the design and optimization of metamaterial beams for vibration suppression applications. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=bandgap" title="bandgap">bandgap</a>, <a href="https://publications.waset.org/abstracts/search?q=adjustable%20stiffness" title=" adjustable stiffness"> adjustable stiffness</a>, <a href="https://publications.waset.org/abstracts/search?q=spatial%20variation" title=" spatial variation"> spatial variation</a>, <a href="https://publications.waset.org/abstracts/search?q=tunability" title=" tunability"> tunability</a> </p> <a href="https://publications.waset.org/abstracts/164781/band-gap-tuning-based-on-adjustable-stiffness-of-local-resonators" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/164781.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">85</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">73</span> Assessment of High Frequency Solidly Mounted Resonator as Viscosity Sensor</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Vinita%20Choudhary">Vinita Choudhary</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Solidly Acoustic Resonators (SMR) based on ZnO piezoelectric material operating at a frequency of 3.96 GHz and 6.49% coupling factor are used to characterize liquids with different viscosities. This behavior of the sensor is analyzed using Finite Element Modeling. Device architectures encapsulate bulk acoustic wave resonators with MO/SiO₂ Bragg mirror reflector and the silicon substrate. The proposed SMR is based on the mass loading effect response of the sensor to the change in the resonant frequency of the resonator that is caused by the increased density due to the absorption of liquids (water, acetone, olive oil) used in theoretical calculation. The sensitivity of sensors ranges from 0.238 MHz/mPa.s to 83.33 MHz/mPa.s, supported by the Kanazawa model. Obtained results are also compared with previous works on BAW viscosity sensors. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=solidly%20mounted%20resonator" title="solidly mounted resonator">solidly mounted resonator</a>, <a href="https://publications.waset.org/abstracts/search?q=bragg%20mirror" title=" bragg mirror"> bragg mirror</a>, <a href="https://publications.waset.org/abstracts/search?q=kanazawa%20model" title=" kanazawa model"> kanazawa model</a>, <a href="https://publications.waset.org/abstracts/search?q=finite%20element%20model" title=" finite element model"> finite element model</a> </p> <a href="https://publications.waset.org/abstracts/164284/assessment-of-high-frequency-solidly-mounted-resonator-as-viscosity-sensor" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/164284.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">82</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">72</span> Influence of Bragg Reflectors Pairs on Resonance Characteristics of Solidly Mounted Resonators</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Vinita%20Choudhary">Vinita Choudhary</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The solidly mounted resonator (SMR) is a bulk acoustic wave-based device consisting of a piezoelectric layer sandwiched between two electrodes upon Bragg reflectors, which then are attached to a substrate. To transform the effective acoustic impedance of the substrate to a near zero value, the Bragg reflectors are composed of alternating high and low acoustic impedance layers of quarter-wavelength thickness. In this work presents the design and investigation of acoustic Bragg reflectors (ABRs) for solidly mounted bulk acoustic wave resonators through analysis and simulation. This performance of the resonator is analyzed using 1D Mason modeling. The performance parameters are the effect of Bragg pairs number on transmissivity, reflectivity, insertion loss, the electromechanical and quality factor of the 5GHz operating resonator. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=bragg%20reflectors" title="bragg reflectors">bragg reflectors</a>, <a href="https://publications.waset.org/abstracts/search?q=SMR" title=" SMR"> SMR</a>, <a href="https://publications.waset.org/abstracts/search?q=insertion%20loss" title=" insertion loss"> insertion loss</a>, <a href="https://publications.waset.org/abstracts/search?q=quality%20factor" title=" quality factor"> quality factor</a> </p> <a href="https://publications.waset.org/abstracts/164288/influence-of-bragg-reflectors-pairs-on-resonance-characteristics-of-solidly-mounted-resonators" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/164288.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">98</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">71</span> Optimization of Temperature Difference Formula at Thermoacoustic Cryocooler Stack with Genetic Algorithm</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=H.%20Afsari">H. Afsari</a>, <a href="https://publications.waset.org/abstracts/search?q=H.%20Shokouhmand"> H. Shokouhmand</a> </p> <p class="card-text"><strong>Abstract:</strong></p> When stack is placed in a thermoacoustic resonator in a cryocooler, one extremity of the stack heats up while the other cools down due to the thermoacoustic effect. In the present, with expression a formula by linear theory, will see this temperature difference depends on what factors. The computed temperature difference is compared to the one predicted by the formula. These discrepancies can not be attributed to non-linear effects, rather they exist because of thermal effects. Two correction factors are introduced for close up results among linear theory and computed and use these correction factors to modified linear theory. In fact, this formula, is optimized by GA (Genetic Algorithm). Finally, results are shown at different Mach numbers and stack location in resonator. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=heat%20transfer" title="heat transfer">heat transfer</a>, <a href="https://publications.waset.org/abstracts/search?q=thermoacoustic%20cryocooler" title=" thermoacoustic cryocooler"> thermoacoustic cryocooler</a>, <a href="https://publications.waset.org/abstracts/search?q=stack" title=" stack"> stack</a>, <a href="https://publications.waset.org/abstracts/search?q=resonator" title=" resonator"> resonator</a>, <a href="https://publications.waset.org/abstracts/search?q=mach%20number" title=" mach number"> mach number</a>, <a href="https://publications.waset.org/abstracts/search?q=genetic%20algorithm" title=" genetic algorithm"> genetic algorithm</a> </p> <a href="https://publications.waset.org/abstracts/39263/optimization-of-temperature-difference-formula-at-thermoacoustic-cryocooler-stack-with-genetic-algorithm" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/39263.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">378</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">70</span> Parametric Analysis of Water Lily Shaped Split Ring Resonator Loaded Fractal Monopole Antenna for Multiband Applications</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=C.%20Elavarasi">C. Elavarasi</a>, <a href="https://publications.waset.org/abstracts/search?q=T.%20Shanmuganantham"> T. Shanmuganantham</a> </p> <p class="card-text"><strong>Abstract:</strong></p> A coplanar waveguide (CPW) feed is presented, and comprising a split ring resonator (SRR) loaded fractal with water lily shape is used for multi band applications. The impedance matching of the antenna is determined by the number of Koch curve fractal unit cells. The antenna is designed on a FR4 substrate with a permittivity of ε<sub>r =</sub> 4.4 and size of 14 x 16 x 1.6 mm<sup>3</sup> to generate multi resonant mode at 3.8 GHz covering S band, 8.68 GHz at X band, 13.96 GHz at Ku band, and 19.74 GHz at K band with reflection coefficient better than -10 dB. Simulation results show that the antenna exhibits the desired voltage standing wave ratio (VSWR) level and radiation patterns across the wide frequency range. The fundamental parameters of the antenna such as return loss, VSWR, good radiation pattern with reasonable gain across the operating bands are obtained. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=fractal" title="fractal">fractal</a>, <a href="https://publications.waset.org/abstracts/search?q=metamaterial" title=" metamaterial"> metamaterial</a>, <a href="https://publications.waset.org/abstracts/search?q=split%20ring%20resonator" title=" split ring resonator"> split ring resonator</a>, <a href="https://publications.waset.org/abstracts/search?q=waterlily%20shape" title=" waterlily shape"> waterlily shape</a> </p> <a href="https://publications.waset.org/abstracts/53253/parametric-analysis-of-water-lily-shaped-split-ring-resonator-loaded-fractal-monopole-antenna-for-multiband-applications" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/53253.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">273</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">69</span> Acoustic Energy Harvesting Using Polyvinylidene Fluoride (PVDF) and PVDF-ZnO Piezoelectric Polymer</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=S.%20M.%20Giripunje">S. M. Giripunje</a>, <a href="https://publications.waset.org/abstracts/search?q=Mohit%20Kumar"> Mohit Kumar</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Acoustic energy that exists in our everyday life and environment have been overlooked as a green energy that can be extracted, generated, and consumed without any significant negative impact to the environment. The harvested energy can be used to enable new technology like wireless sensor networks. Technological developments in the realization of truly autonomous MEMS devices and energy storage systems have made acoustic energy harvesting (AEH) an increasingly viable technology. AEH is the process of converting high and continuous acoustic waves from the environment into electrical energy by using an acoustic transducer or resonator. AEH is not popular as other types of energy harvesting methods since sound waves have lower energy density and such energy can only be harvested in very noisy environment. However, the energy requirements for certain applications are also correspondingly low and also there is a necessity to observe the noise to reduce noise pollution. So the ability to reclaim acoustic energy and store it in a usable electrical form enables a novel means of supplying power to relatively low power devices. A quarter-wavelength straight-tube acoustic resonator as an acoustic energy harvester is introduced with polyvinylidene fluoride (PVDF) and PVDF doped with ZnO nanoparticles, piezoelectric cantilever beams placed inside the resonator. When the resonator is excited by an incident acoustic wave at its first acoustic eigen frequency, an amplified acoustic resonant standing wave is developed inside the resonator. The acoustic pressure gradient of the amplified standing wave then drives the vibration motion of the PVDF piezoelectric beams, generating electricity due to the direct piezoelectric effect. In order to maximize the amount of the harvested energy, each PVDF and PVDF-ZnO piezoelectric beam has been designed to have the same structural eigen frequency as the acoustic eigen frequency of the resonator. With a single PVDF beam placed inside the resonator, the harvested voltage and power become the maximum near the resonator tube open inlet where the largest acoustic pressure gradient vibrates the PVDF beam. As the beam is moved to the resonator tube closed end, the voltage and power gradually decrease due to the decreased acoustic pressure gradient. Multiple piezoelectric beams PVDF and PVDF-ZnO have been placed inside the resonator with two different configurations: the aligned and zigzag configurations. With the zigzag configuration which has the more open path for acoustic air particle motions, the significant increases in the harvested voltage and power have been observed. Due to the interruption of acoustic air particle motion caused by the beams, it is found that placing PVDF beams near the closed tube end is not beneficial. The total output voltage of the piezoelectric beams increases linearly as the incident sound pressure increases. This study therefore reveals that the proposed technique used to harvest sound wave energy has great potential of converting free energy into useful energy. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=acoustic%20energy" title="acoustic energy">acoustic energy</a>, <a href="https://publications.waset.org/abstracts/search?q=acoustic%20resonator" title=" acoustic resonator"> acoustic resonator</a>, <a href="https://publications.waset.org/abstracts/search?q=energy%20harvester" title=" energy harvester"> energy harvester</a>, <a href="https://publications.waset.org/abstracts/search?q=eigenfrequency" title=" eigenfrequency"> eigenfrequency</a>, <a href="https://publications.waset.org/abstracts/search?q=polyvinylidene%20fluoride%20%28PVDF%29" title=" polyvinylidene fluoride (PVDF)"> polyvinylidene fluoride (PVDF)</a> </p> <a href="https://publications.waset.org/abstracts/44425/acoustic-energy-harvesting-using-polyvinylidene-fluoride-pvdf-and-pvdf-zno-piezoelectric-polymer" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/44425.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">385</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">68</span> Design of a Dual Polarized Resonator Antenna for Mobile Communication System</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=N.%20Fhafhiem">N. Fhafhiem</a>, <a href="https://publications.waset.org/abstracts/search?q=P.%20Krachodnok"> P. Krachodnok</a>, <a href="https://publications.waset.org/abstracts/search?q=R.%20Wongsan"> R. Wongsan</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This paper proposes the development and design of double layer metamaterials based on electromagnetic band gap (EBG) rods as a superstrate of a resonator antenna to enhance required antenna characteristics for the mobile base station. The metallic rod type metamaterial can partially reflect wave of a primary radiator. The antenna was designed and analyzed by a simulation result from CST Microwave Studio and designed technique could be confirmed by a measurement results from prototype antenna that agree with simulation results. The results indicate that the antenna can also generate a dual polarization by using a 45˚ oriented curved strip dipole located at the center of the reflector plane with double layer superstrate. It can be used to simplify the feed system of an antenna. The proposed antenna has a bandwidth covering the frequency range of 1920 – 2200 MHz, the gain of the antenna increases up to 14.06 dBi. In addition, an interesting sectoral 60˚ pattern is presented in horizontal plane. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=metamaterial" title="metamaterial">metamaterial</a>, <a href="https://publications.waset.org/abstracts/search?q=electromagnetic%20band%20gap" title=" electromagnetic band gap"> electromagnetic band gap</a>, <a href="https://publications.waset.org/abstracts/search?q=dual%20polarization" title=" dual polarization"> dual polarization</a>, <a href="https://publications.waset.org/abstracts/search?q=resonator%20antenna" title=" resonator antenna"> resonator antenna</a> </p> <a href="https://publications.waset.org/abstracts/12371/design-of-a-dual-polarized-resonator-antenna-for-mobile-communication-system" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/12371.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">386</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">67</span> Insertion Loss Improvement of a Two-Port Saw Resonator Based on AlN via Alloying with Transition Metals</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Kanouni%20Fares">Kanouni Fares</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This paper describes application of X-doped AlN (X=Sc, Cr and Y) to wideband surface acoustic wave (SAW) resonators in 200–300 MHz range. First, it is shown theoretically that Cr doped AlN thin film has the highest piezoelectric strain constant, accompanied by a lowest mechanical softening compared to Sc doped AlScN and Y doped AlN thin films for transition metals concentrations ranging from 0 to 25%. Next, the impact of transition metals (Sc, Cr and Y) concentration have been carried out for the first time, in terms of surface wave velocity, electrode reflectivity, transduction coefficient and distributed finger capacitance. Finely, the insertion loss of two-port SAW resonator based on AlXN (X=Sc, Cr and Y) deposited on sapphire substrate is obtained using P-matrix model, and it is shown that AlCrN-SAW resonator exhibit lower insertion loss compared to those based on AlScN and AlYN for metal concentrations of 25%.This finding may position Cr doped AlN as a prime piezoelectric material for low loss SAW resonators whose performance can be tuned via Cr composition. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=P-Matrix" title="P-Matrix">P-Matrix</a>, <a href="https://publications.waset.org/abstracts/search?q=SAW-delay%20line" title=" SAW-delay line"> SAW-delay line</a>, <a href="https://publications.waset.org/abstracts/search?q=interdigital%20transducer" title=" interdigital transducer"> interdigital transducer</a>, <a href="https://publications.waset.org/abstracts/search?q=nitride%20aluminum" title=" nitride aluminum"> nitride aluminum</a>, <a href="https://publications.waset.org/abstracts/search?q=metals%20transition" title=" metals transition"> metals transition</a> </p> <a href="https://publications.waset.org/abstracts/117853/insertion-loss-improvement-of-a-two-port-saw-resonator-based-on-aln-via-alloying-with-transition-metals" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/117853.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">121</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">66</span> Improving the Frequency Response of a Circular Dual-Mode Resonator with a Reconfigurable Bandwidth</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Muhammad%20Haitham%20Albahnassi">Muhammad Haitham Albahnassi</a>, <a href="https://publications.waset.org/abstracts/search?q=Adnan%20Malki"> Adnan Malki</a>, <a href="https://publications.waset.org/abstracts/search?q=Shokri%20Almekdad"> Shokri Almekdad</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In this paper, a method for reconfiguring bandwidth in a circular dual-mode resonator is presented. The method concerns the optimized geometry of a structure that may be used to host the tuning elements, which are typically RF (Radio Frequency) switches. The tuning elements themselves, and their performance during tuning, are not the focus of this paper. The designed resonator is able to reconfigure its fractional bandwidth by adjusting the inter-coupling level between the degenerate modes, while at the same time improving its response by adjusting the external-coupling level and keeping the center frequency fixed. The inter-coupling level has been adjusted by changing the dimensions of the perturbation element, while the external-coupling level has been adjusted by changing one of the feeder dimensions. The design was arrived at via optimization. Agreeing simulation and measurement results of the designed and implemented filters showed good improvements in return loss values and the stability of the center frequency. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=dual-mode%20resonators" title="dual-mode resonators">dual-mode resonators</a>, <a href="https://publications.waset.org/abstracts/search?q=perturbation%20theory" title=" perturbation theory"> perturbation theory</a>, <a href="https://publications.waset.org/abstracts/search?q=reconfigurable%20filters" title=" reconfigurable filters"> reconfigurable filters</a>, <a href="https://publications.waset.org/abstracts/search?q=software%20defined%20radio" title=" software defined radio"> software defined radio</a>, <a href="https://publications.waset.org/abstracts/search?q=cognitine%20radio" title=" cognitine radio "> cognitine radio </a> </p> <a href="https://publications.waset.org/abstracts/118849/improving-the-frequency-response-of-a-circular-dual-mode-resonator-with-a-reconfigurable-bandwidth" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/118849.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">167</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">65</span> On-Chip Ku-Band Bandpass Filter with Compact Size and Wide Stopband</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Jyh%20Sheen">Jyh Sheen</a>, <a href="https://publications.waset.org/abstracts/search?q=Yang-Hung%20Cheng"> Yang-Hung Cheng</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This paper presents a design of a microstrip bandpass filter with a compact size and wide stopband by using 0.15-μm GaAs pHEMT process. The wide stop band is achieved by suppressing the first and second harmonic resonance frequencies. The slow-wave coupling stepped impedance resonator with cross coupled structure is adopted to design the bandpass filter. A two-resonator filter was fabricated with 13.5GHz center frequency and 11% bandwidth was achieved. The devices are simulated using the ADS design software. This device has shown a compact size and very low insertion loss of 2.6 dB. Microstrip planar bandpass filters have been widely adopted in various communication applications due to the attractive features of compact size and ease of fabricating. Various planar resonator structures have been suggested. In order to reach a wide stopband to reduce the interference outside the passing band, various designs of planar resonators have also been submitted to suppress the higher order harmonic frequencies of the designed center frequency. Various modifications to the traditional hairpin structure have been introduced to reduce large design area of hairpin designs. The stepped-impedance, slow-wave open-loop, and cross-coupled resonator structures have been studied to miniaturize the hairpin resonators. In this study, to suppress the spurious harmonic bands and further reduce the filter size, a modified hairpin-line bandpass filter with cross coupled structure is suggested by introducing the stepped impedance resonator design as well as the slow-wave open-loop resonator structure. In this way, very compact circuit size as well as very wide upper stopband can be achieved and realized in a Roger 4003C substrate. On the other hand, filters constructed with integrated circuit technology become more attractive for enabling the integration of the microwave system on a single chip (SOC). To examine the performance of this design structure at the integrated circuit, the filter is fabricated by the 0.15 μm pHEMT GaAs integrated circuit process. This pHEMT process can also provide a much better circuit performance for high frequency designs than those made on a PCB board. The design example was implemented in GaAs with center frequency at 13.5 GHz to examine the performance in higher frequency in detail. The occupied area is only about 1.09×0.97 mm2. The ADS software is used to design those modified filters to suppress the first and second harmonics. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=microstrip%20resonator" title="microstrip resonator">microstrip resonator</a>, <a href="https://publications.waset.org/abstracts/search?q=bandpass%20filter" title=" bandpass filter"> bandpass filter</a>, <a href="https://publications.waset.org/abstracts/search?q=harmonic%20suppression" title=" harmonic suppression"> harmonic suppression</a>, <a href="https://publications.waset.org/abstracts/search?q=GaAs" title=" GaAs"> GaAs</a> </p> <a href="https://publications.waset.org/abstracts/74887/on-chip-ku-band-bandpass-filter-with-compact-size-and-wide-stopband" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/74887.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">326</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">64</span> Full-Wave Analysis of Magnetic Meta-Surfaces for Microwave Component Applications </h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Christopher%20Hardly%20Joseph">Christopher Hardly Joseph</a>, <a href="https://publications.waset.org/abstracts/search?q=Nicola%20Pelagalli"> Nicola Pelagalli</a>, <a href="https://publications.waset.org/abstracts/search?q=Davide%20Mencarelli"> Davide Mencarelli</a>, <a href="https://publications.waset.org/abstracts/search?q=Luca%20Pierantoni"> Luca Pierantoni</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In this contribution, we report the electromagnetic response of a split ring resonator (SRR) based magnetic metamaterial unit cell in free space nature by means of a full-wave electromagnetic simulation. The effective parameters of these designed structures have been analyzed. The structures have been specifically designed to work at high frequency considering the development of many microwave and lower mm-wave devices. In addition to that, the application of the designed metamaterial structures is also proposed, namely metamaterial loaded planar transmission lines, potentially useful to optimize size and quality factor of circuit components and radiating elements. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=CPW" title="CPW">CPW</a>, <a href="https://publications.waset.org/abstracts/search?q=Microwave%20Components" title=" Microwave Components"> Microwave Components</a>, <a href="https://publications.waset.org/abstracts/search?q=Negative%20Permeability" title=" Negative Permeability"> Negative Permeability</a>, <a href="https://publications.waset.org/abstracts/search?q=Split%20Ring%20Resonator%20%28SRR%29" title=" Split Ring Resonator (SRR)"> Split Ring Resonator (SRR)</a> </p> <a href="https://publications.waset.org/abstracts/122917/full-wave-analysis-of-magnetic-meta-surfaces-for-microwave-component-applications" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/122917.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">179</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">63</span> A Connected Structure of All-Optical Logic Gate “NOT-AND”</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Roumaissa%20Derdour">Roumaissa Derdour</a>, <a href="https://publications.waset.org/abstracts/search?q=Lebbal%20Mohamed%20Redha"> Lebbal Mohamed Redha</a> </p> <p class="card-text"><strong>Abstract:</strong></p> We present a study of the transmission of the all-optical logic gate using a structure connected with a triangular photonic crystal lattice that is improved. The proposed logic gate consists of a photonic crystal nano-resonator formed by changing the size of the air holes. In addition to the simplicity, the response time is very short, and the designed nano-resonator increases the bit rate of the logic gate. The two-dimensional finite difference time domain (2DFDTD) method is used to simulate the structure; the transmission obtained is about 98% with very negligible losses. The proposed photonic crystal AND logic gate is widely used in future integrated optical microelectronics. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=logic%20gates" title="logic gates">logic gates</a>, <a href="https://publications.waset.org/abstracts/search?q=photonic%20crystals" title=" photonic crystals"> photonic crystals</a>, <a href="https://publications.waset.org/abstracts/search?q=optical%20integrated%20circuits" title=" optical integrated circuits"> optical integrated circuits</a>, <a href="https://publications.waset.org/abstracts/search?q=resonant%20cavities" title=" resonant cavities"> resonant cavities</a> </p> <a href="https://publications.waset.org/abstracts/161597/a-connected-structure-of-all-optical-logic-gate-not-and" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/161597.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">98</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">62</span> Design and Synthesis of Two Tunable Bandpass Filters Based on Varactors and Defected Ground Structure</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=M%27Hamed%20Boulakroune">M'Hamed Boulakroune</a>, <a href="https://publications.waset.org/abstracts/search?q=Mouloud%20Challal"> Mouloud Challal</a>, <a href="https://publications.waset.org/abstracts/search?q=Hassiba%20Louazene"> Hassiba Louazene</a>, <a href="https://publications.waset.org/abstracts/search?q=Saida%20Fentiz"> Saida Fentiz</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This paper presents a new ultra wideband (UWB) microstrip bandpass filter (BPF) at microwave frequencies. The first one is based on multiple-mode resonator (MMR) and rectangular-shaped defected ground structure (DGS). This filter, which is compact size of 25.2 x 3.8 mm2, provides in the pass band an insertion loss of 0.57 dB and a return loss greater than 12 dB. The second structure is a tunable bandpass filters using planar patch resonators based on diode varactor. This filter is formed by a triple mode circular patch resonator with two pairs of slots, in which the varactors are connected. Indeed, this filter is initially centered at 2.4 GHz, the center frequency of the tunable patch filter could be tuned up to 1.8 GHz simultaneously with the bandwidth, reaching high tuning ranges. Lossless simulations were compared to those considering the substrate dielectric, conductor losses, and the equivalent electrical circuit model of the tuning element in order to assess their effects. Within these variations, simulation results showed insertion loss better than 2 dB and return loss better than 10 dB over the passband. The proposed filters presents good performances and the simulation results are in satisfactory agreement with the experimentation ones reported elsewhere. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=defected%20ground%20structure" title="defected ground structure">defected ground structure</a>, <a href="https://publications.waset.org/abstracts/search?q=diode%20varactor" title=" diode varactor"> diode varactor</a>, <a href="https://publications.waset.org/abstracts/search?q=microstrip%20bandpass%20filter" title=" microstrip bandpass filter"> microstrip bandpass filter</a>, <a href="https://publications.waset.org/abstracts/search?q=multiple-mode%20resonator" title=" multiple-mode resonator"> multiple-mode resonator</a> </p> <a href="https://publications.waset.org/abstracts/23038/design-and-synthesis-of-two-tunable-bandpass-filters-based-on-varactors-and-defected-ground-structure" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/23038.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">311</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">61</span> Notched Bands in Ultra-Wideband UWB Filter Design for Advanced Wireless Applications</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Abdul%20Basit">Abdul Basit</a>, <a href="https://publications.waset.org/abstracts/search?q=Amil%20Daraz"> Amil Daraz</a>, <a href="https://publications.waset.org/abstracts/search?q=Guoqiang%20Zhang"> Guoqiang Zhang</a> </p> <p class="card-text"><strong>Abstract:</strong></p> With the increasing demand for wireless communication systems for unlicensed indoor applications, the FCC, in February 2002, allocated unlicensed bands ranging from 3.1 GHZ to 10.6 GHz with fractional bandwidth of about 109 %, because it plays a key role in the radiofrequency (RF) front ends devices and has been widely applied in many other microwave circuits. Targeting the proposed band defined by the FCC for the UWB system, this article presents a UWB bandpass filter with three stop bands for the mitigation of wireless bands that may interfere with the UWB range. For this purpose, two resonators are utilized for the implementation of triple-notched bands. The C-shaped resonator is used for the first notch band creation at 3.4 GHz to suppress the WiMAX signal, while the H-shaped resonator is employed in the initial UWB design to introduce the dual notched characteristic at 4.5 GHz and 8.1 GHz to reject the WLAN and Satellite Communication signals. The overall circuit area covered by the proposed design is 30.6 mm × 20 mm, or in terms of guided wavelength at the first stopband, its size is 0.06 λg × 0.02 λg. The presented structure shows a good return loss under -10 dB over most of the passband and greater than -15 dB for the notched frequency bands. Finally, the filter is simulated and analyzed in HFSS 15.0. All the bands for the rejection of wireless signals are independently controlled, which makes this work superior to the rest of the UWB filters presented in the literature. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=a%20bandpass%20filter%20%28BPF%29" title="a bandpass filter (BPF)">a bandpass filter (BPF)</a>, <a href="https://publications.waset.org/abstracts/search?q=ultra-wideband%20%28UWB%29" title=" ultra-wideband (UWB)"> ultra-wideband (UWB)</a>, <a href="https://publications.waset.org/abstracts/search?q=wireless%20communication" title=" wireless communication"> wireless communication</a>, <a href="https://publications.waset.org/abstracts/search?q=C-shaped%20resonator" title=" C-shaped resonator"> C-shaped resonator</a>, <a href="https://publications.waset.org/abstracts/search?q=triple%20notch" title=" triple notch"> triple notch</a> </p> <a href="https://publications.waset.org/abstracts/173846/notched-bands-in-ultra-wideband-uwb-filter-design-for-advanced-wireless-applications" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/173846.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">80</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">60</span> Overview of Fiber Optic Gyroscopes</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=M.%20Abdo">M. Abdo</a>, <a href="https://publications.waset.org/abstracts/search?q=Ahmed%20Elghandour"> Ahmed Elghandour</a>, <a href="https://publications.waset.org/abstracts/search?q=Khairy%20Eltahlawy"> Khairy Eltahlawy</a>, <a href="https://publications.waset.org/abstracts/search?q=Mohamed%20Shalaby"> Mohamed Shalaby</a> </p> <p class="card-text"><strong>Abstract:</strong></p> A key development in the field of inertial sensors, fiber-optic gyroscopes (FOGs) are currently thought to be a competitive alternative to mechanical gyroscopes for inertial navigation and control applications. For the past few years, research and development efforts have been conducted all around the world using the FOG as a crucial sensor for high-accuracy inertial navigation systems. The main fundamentals of optical gyros were covered in this essay, followed by discussions of the main types of optical gyros—fiber optic gyroscopes and ring laser gyroscopes—and comparisons between them. We also discussed different types of fiber optic gyros, including interferometric, resonator, and brillion fiber optic gyroscopes. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=mechanical%20gyros" title="mechanical gyros">mechanical gyros</a>, <a href="https://publications.waset.org/abstracts/search?q=ring%20laser%20gyros" title=" ring laser gyros"> ring laser gyros</a>, <a href="https://publications.waset.org/abstracts/search?q=interferometric%20fiber%20optic%20gyros" title=" interferometric fiber optic gyros"> interferometric fiber optic gyros</a>, <a href="https://publications.waset.org/abstracts/search?q=resonator%20fiber%20optic%20gyros" title=" resonator fiber optic gyros"> resonator fiber optic gyros</a> </p> <a href="https://publications.waset.org/abstracts/168383/overview-of-fiber-optic-gyroscopes" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/168383.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">85</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">59</span> Overview of Fiber Optic Gyroscopes as Ring Laser Gyros and Fiber Optic Gyros and the Comparison Between Them</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=M.%20Abdo">M. Abdo</a>, <a href="https://publications.waset.org/abstracts/search?q=Mohamed%20Shalaby"> Mohamed Shalaby</a> </p> <p class="card-text"><strong>Abstract:</strong></p> A key development in the field of inertial sensors, fiber-optic gyroscopes (FOGs) are currently thought to be a competitive alternative to mechanical gyroscopes for inertial navigation and control applications. For the past few years, research and development efforts have been conducted all around the world using the FOG as a crucial sensor for high-accuracy inertial navigation systems. The main fundamentals of optical gyros were covered in this essay, followed by discussions of the main types of optical gyros and fiber optic gyroscopes and ring laser gyroscopes and comparisons between them. We also discussed different types of fiber optic gyros, including interferometric, resonator, and Brillion fiber optic gyroscopes. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=mechanical%20gyros" title="mechanical gyros">mechanical gyros</a>, <a href="https://publications.waset.org/abstracts/search?q=ring%20laser%20gyros" title=" ring laser gyros"> ring laser gyros</a>, <a href="https://publications.waset.org/abstracts/search?q=interferometric%20finer%20optic%20gyros" title=" interferometric finer optic gyros"> interferometric finer optic gyros</a>, <a href="https://publications.waset.org/abstracts/search?q=Resonator%20fiber%20optic%20gyros" title=" Resonator fiber optic gyros"> Resonator fiber optic gyros</a> </p> <a href="https://publications.waset.org/abstracts/168331/overview-of-fiber-optic-gyroscopes-as-ring-laser-gyros-and-fiber-optic-gyros-and-the-comparison-between-them" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/168331.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">80</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">58</span> Nanomechanical Devices Vibrating at Microwave Frequencies in Simple Liquids</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Debadi%20Chakraborty">Debadi Chakraborty</a>, <a href="https://publications.waset.org/abstracts/search?q=John%20E.%20Sader"> John E. Sader</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Nanomechanical devices have emerged as a versatile platform for a host of applications due to their extreme sensitivity to environmental conditions. For example, mass measurements with sensitivity at the atomic level have recently been demonstrated. Ultrafast laser spectroscopy coherently excite the vibrational modes of metal nanoparticles and permits precise measurement of the vibration characteristics as a function of nanoparticle shape, size and surrounding environment. This study reports that the vibration of metal nanoparticles in simple liquids, like water and glycerol are not described by conventional fluid mechanics, i.e., Navier Stokes equations. The intrinsic molecular relaxation processes in the surrounding liquid are found to have a profound effect on the fluid-structure interaction of mechanical devices at nanometre scales. Theoretical models have been developed based on the non-Newtonian viscoelastic fluid-structure interaction theory to investigate the vibration of nanoparticles immersed in simple fluids. The utility of this theoretical framework is demonstrated by comparison to measurements on single nanowires and ensembles of metal rods. This study provides a rigorous foundation for the use of metal nanoparticles as ultrasensitive mechanical sensors in fluid and opens a new paradigm for understanding extremely high frequency fluid mechanics, nanoscale sensing technologies, and biophysical processes. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=fluid-structure%20interaction" title="fluid-structure interaction">fluid-structure interaction</a>, <a href="https://publications.waset.org/abstracts/search?q=nanoparticle%20vibration" title=" nanoparticle vibration"> nanoparticle vibration</a>, <a href="https://publications.waset.org/abstracts/search?q=ultrafast%20laser%20spectroscopy" title=" ultrafast laser spectroscopy"> ultrafast laser spectroscopy</a>, <a href="https://publications.waset.org/abstracts/search?q=viscoelastic%20damping" title=" viscoelastic damping"> viscoelastic damping</a> </p> <a href="https://publications.waset.org/abstracts/46970/nanomechanical-devices-vibrating-at-microwave-frequencies-in-simple-liquids" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/46970.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">274</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">57</span> Improvement and Miniaturization RFID Patch Antenna by Inclusion the Complementary Metamaterials</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Seif%20Naoui">Seif Naoui</a>, <a href="https://publications.waset.org/abstracts/search?q=Lassaad%20Latrach"> Lassaad Latrach</a>, <a href="https://publications.waset.org/abstracts/search?q=Ali%20Gharsallah"> Ali Gharsallah</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This paper is specialized to highlight the method of miniaturization and improvement the patch antenna by using the complementary metamaterial. This method is presented by a simple technique is composed a structure of patch antenna integrated in its surface a cell of complementary split ring resonator. This resonator is placed at the middle of the radiating patch in parallel with the transmission line and with a variable angle of orientation. The objective is to find the ultimate angle where the best results are obtained on improving the characteristics of the considered antenna. This motif widespread at the traceability applications by wireless communication for RFID technology at the operation frequency 2.45 GHz. Our contribution is based on studies empirical often presented in this article. All simulation results were made by the CST Microwave Studio. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=complimentary%20split%20ring%20resonators" title="complimentary split ring resonators">complimentary split ring resonators</a>, <a href="https://publications.waset.org/abstracts/search?q=computer%20simulation%20technology%20microwave%20studio" title=" computer simulation technology microwave studio"> computer simulation technology microwave studio</a>, <a href="https://publications.waset.org/abstracts/search?q=metamaterials%20patch%20antennas" title=" metamaterials patch antennas"> metamaterials patch antennas</a>, <a href="https://publications.waset.org/abstracts/search?q=microstrip%20patch%20antenna" title=" microstrip patch antenna"> microstrip patch antenna</a>, <a href="https://publications.waset.org/abstracts/search?q=radio%20frequency%20identification" title=" radio frequency identification"> radio frequency identification</a> </p> <a href="https://publications.waset.org/abstracts/28790/improvement-and-miniaturization-rfid-patch-antenna-by-inclusion-the-complementary-metamaterials" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/28790.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">440</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">56</span> Tuning Nanomechanical Properties of Stimuli-Responsive Hydrogel Nanocomposite Thin Films for Biomedical Applications</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Mallikarjunachari%20Gangapuram">Mallikarjunachari Gangapuram</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The design of stimuli-responsive hydrogel nanocomposite thin films is gaining significant attention in these days due to its wide variety of applications. Soft microrobots, drug delivery, biosensors, regenerative medicine, bacterial adhesion, energy storage and wound dressing are few advanced applications in different fields. In this research work, the nanomechanical properties of composite thin films of 20 microns were tuned by applying homogeneous external DC, and AC magnetic fields of magnitudes 0.05 T and 0.1 T. Polyvinyl alcohol (PVA) used as a matrix material and elliptical hematite nanoparticles (ratio of the length of the major axis to the length of the minor axis is 140.59 ± 1.072 nm/52.84 ± 1.072 nm) used as filler materials to prepare the nanocomposite thin films. Both quasi-static nanoindentation, Nano Dynamic Mechanical Analysis (Nano-DMA) tests were performed to characterize the viscoelastic properties of PVA, PVA+Hematite (0.1% wt, 2% wt and 4% wt) nanocomposites. Different properties such as storage modulus, loss modulus, hardness, and Er/H were carefully analyzed. The increase in storage modulus, hardness, Er/H and a decrease in loss modulus were observed with increasing concentration and DC magnetic field followed by AC magnetic field. Contact angle and ATR-FTIR experiments were conducted to understand the molecular mechanisms such as hydrogen bond formation, crosslinking density, and particle-particle interactions. This systematic study is helpful in design and modeling of magnetic responsive hydrogel nanocomposite thin films for biomedical applications. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=hematite" title="hematite">hematite</a>, <a href="https://publications.waset.org/abstracts/search?q=hydrogel" title=" hydrogel"> hydrogel</a>, <a href="https://publications.waset.org/abstracts/search?q=nanoindentation" title=" nanoindentation"> nanoindentation</a>, <a href="https://publications.waset.org/abstracts/search?q=nano-DMA" title=" nano-DMA"> nano-DMA</a> </p> <a href="https://publications.waset.org/abstracts/74372/tuning-nanomechanical-properties-of-stimuli-responsive-hydrogel-nanocomposite-thin-films-for-biomedical-applications" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/74372.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">192</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">55</span> A Parasitic Resonator-Based Diamond Shape Microstrip Antenna for Ultra-Wide-Band Applications</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=M.%20Zulfiker%20Mahmud">M. Zulfiker Mahmud</a>, <a href="https://publications.waset.org/abstracts/search?q=M.%20Naimur%20Rahman"> M. Naimur Rahman</a>, <a href="https://publications.waset.org/abstracts/search?q=Farhad%20%20Bin%20Ashraf"> Farhad Bin Ashraf</a>, <a href="https://publications.waset.org/abstracts/search?q=Norbahiah%20Misran"> Norbahiah Misran</a>, <a href="https://publications.waset.org/abstracts/search?q=Mohammad%20Tariqul%20Islam"> Mohammad Tariqul Islam</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This study proposes a diamond-shaped microstrip patch antenna for ultra-wideband applications. The antenna is made up of a diamond shape radiating patch, partial ground plane, and three asterisk-shaped parasitic elements. The parasitic elements are positioned above the ground plane to enhance the bandwidth and gain. The proposed antenna has a compact dimension of 30 x 25 x 1.6 mm3 and achieves an overall bandwidth (S11<-10dB) is 5.8 GHz from 2.7 GHz to 8.5 GHz. The antenna attains more than 4 dBi realized the gain and 80% efficiency over the bandwidth with omnidirectional radiation pattern. The design and simulation of the proposed antenna are performed in Computer Simulation Technology (CST) Microwave Studio. The observation during the analysis of the simulated data reveals that the proposed antenna is suitable for Ultra wide-band (UWB) applications where high gain is required. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=diamond-shaped%20antenna" title="diamond-shaped antenna">diamond-shaped antenna</a>, <a href="https://publications.waset.org/abstracts/search?q=microstrip%20antenna" title=" microstrip antenna"> microstrip antenna</a>, <a href="https://publications.waset.org/abstracts/search?q=parasitic%20resonator" title=" parasitic resonator"> parasitic resonator</a>, <a href="https://publications.waset.org/abstracts/search?q=UWB%20applications" title=" UWB applications"> UWB applications</a> </p> <a href="https://publications.waset.org/abstracts/91476/a-parasitic-resonator-based-diamond-shape-microstrip-antenna-for-ultra-wide-band-applications" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/91476.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">223</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">54</span> Design of Wireless Readout System for Resonant Gas Sensors</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=S.%20Mohamed%20Rabeek">S. Mohamed Rabeek</a>, <a href="https://publications.waset.org/abstracts/search?q=Mi%20Kyoung%20Park"> Mi Kyoung Park</a>, <a href="https://publications.waset.org/abstracts/search?q=M.%20Annamalai%20Arasu"> M. Annamalai Arasu </a> </p> <p class="card-text"><strong>Abstract:</strong></p> This paper presents a design of a wireless read out system for tracking the frequency shift of the polymer coated piezoelectric micro electromechanical resonator due to gas absorption. The measure of this frequency shift indicates the percentage of a particular gas the sensor is exposed to. It is measured using an oscillator and an FPGA based frequency counter by employing the resonator as a frequency determining element in the oscillator. This system consists of a Gas Sensing Wireless Readout (GSWR) and an USB Wireless Transceiver (UWT). GSWR consists of an oscillator based on a trans-impedance sustaining amplifier, an FPGA based frequency readout, a sub 1GHz wireless transceiver and a micro controller. UWT can be plugged into the computer via USB port and function as a wireless module to transfer gas sensor data from GSWR to the computer through its USB port. GUI program running on the computer periodically polls for sensor data through UWT - GSWR wireless link, the response from GSWR is logged in a file for post processing as well as displayed on screen. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=gas%20sensor" title="gas sensor">gas sensor</a>, <a href="https://publications.waset.org/abstracts/search?q=GSWR" title=" GSWR"> GSWR</a>, <a href="https://publications.waset.org/abstracts/search?q=micromechanical%20system" title=" micromechanical system"> micromechanical system</a>, <a href="https://publications.waset.org/abstracts/search?q=UWT" title=" UWT"> UWT</a>, <a href="https://publications.waset.org/abstracts/search?q=volatile%20emissions" title=" volatile emissions"> volatile emissions</a> </p> <a href="https://publications.waset.org/abstracts/35201/design-of-wireless-readout-system-for-resonant-gas-sensors" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/35201.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">483</span> </span> </div> </div> <ul class="pagination"> <li class="page-item disabled"><span class="page-link">&lsaquo;</span></li> <li class="page-item active"><span class="page-link">1</span></li> <li class="page-item"><a class="page-link" href="https://publications.waset.org/abstracts/search?q=nanomechanical%20resonator&page=2">2</a></li> <li class="page-item"><a class="page-link" href="https://publications.waset.org/abstracts/search?q=nanomechanical%20resonator&page=3">3</a></li> <li class="page-item"><a class="page-link" href="https://publications.waset.org/abstracts/search?q=nanomechanical%20resonator&page=2" rel="next">&rsaquo;</a></li> </ul> </div> </main> <footer> <div id="infolinks" class="pt-3 pb-2"> <div class="container"> <div 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