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is-link">Go</button> </div> </div> </form> </div> </div> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2501.09759">arXiv:2501.09759</a> <span> [<a href="https://arxiv.org/pdf/2501.09759">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Signal Processing">eess.SP</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> </div> </div> <p class="title is-5 mathjax"> A wideband amplifying and filtering reconfigurable intelligent surface for wireless relay </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Wu%2C+L">Lijie Wu</a>, <a href="/search/physics?searchtype=author&query=Zhou%2C+Q+Y">Qun Yan Zhou</a>, <a href="/search/physics?searchtype=author&query=Dai%2C+J+Y">Jun Yan Dai</a>, <a href="/search/physics?searchtype=author&query=Wang%2C+S">Siran Wang</a>, <a href="/search/physics?searchtype=author&query=Zhang%2C+J">Junwei Zhang</a>, <a href="/search/physics?searchtype=author&query=Qi%2C+Z+J">Zhen Jie Qi</a>, <a href="/search/physics?searchtype=author&query=Yang%2C+H">Hanqing Yang</a>, <a href="/search/physics?searchtype=author&query=Jiang%2C+R">Ruizhe Jiang</a>, <a href="/search/physics?searchtype=author&query=Wang%2C+Z+X">Zheng Xing Wang</a>, <a href="/search/physics?searchtype=author&query=Li%2C+H">Huidong Li</a>, <a href="/search/physics?searchtype=author&query=Zhang%2C+Z">Zhen Zhang</a>, <a href="/search/physics?searchtype=author&query=Luo%2C+J">Jiang Luo</a>, <a href="/search/physics?searchtype=author&query=Cheng%2C+Q">Qiang Cheng</a>, <a href="/search/physics?searchtype=author&query=Cui%2C+T+J">Tie Jun Cui</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2501.09759v1-abstract-short" style="display: inline;"> Programmable metasurfaces have garnered significant attention due to their exceptional ability to manipulate electromagnetic (EM) waves in real time, leading to the emergence of a prominent area in wireless communication, namely reconfigurable intelligent surfaces (RISs), to control the signal propagation and coverage. However, the existing RISs usually suffer from limited operating distance and b… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2501.09759v1-abstract-full').style.display = 'inline'; document.getElementById('2501.09759v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2501.09759v1-abstract-full" style="display: none;"> Programmable metasurfaces have garnered significant attention due to their exceptional ability to manipulate electromagnetic (EM) waves in real time, leading to the emergence of a prominent area in wireless communication, namely reconfigurable intelligent surfaces (RISs), to control the signal propagation and coverage. However, the existing RISs usually suffer from limited operating distance and band interference, which hinder their practical applications in wireless relay and communication systems. To overcome the limitations, we propose an amplifying and filtering RIS (AF-RIS) to enhance the in-band signal energy and filter the out-of-band signal of the incident EM waves, ensuring the miniaturization of the RIS array and enabling its anti-interference ability. In addition, each AF-RIS element is equipped with a 2-bit phase control capability, further endowing the entire array with great beamforming performance. An elaborately designed 4*8 AF-RIS array is presented by integrating the power dividing and combining networks, which substantially reduces the number of amplifiers and filters, thereby reducing the hardware costs and power consumption. Experimental results showcase the powerful capabilities of AF-RIS in beam-steering, frequency selectivity, and signal amplification. Therefore, the proposed AF-RIS holds significant promise for critical applications in wireless relay systems by offering an efficient solution to improve frequency selectivity, enhance signal coverage, and reduce hardware size. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2501.09759v1-abstract-full').style.display = 'none'; document.getElementById('2501.09759v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 31 December, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2025. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2411.05690">arXiv:2411.05690</a> <span> [<a href="https://arxiv.org/pdf/2411.05690">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> </div> </div> <p class="title is-5 mathjax"> Multiple-partition cross-modulation programmable metasurface empowering wireless communications </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Zhang%2C+J+W">Jun Wei Zhang</a>, <a href="/search/physics?searchtype=author&query=Qi%2C+Z+J">Zhen Jie Qi</a>, <a href="/search/physics?searchtype=author&query=Wu%2C+L+J">Li Jie Wu</a>, <a href="/search/physics?searchtype=author&query=Cao%2C+W+W">Wan Wan Cao</a>, <a href="/search/physics?searchtype=author&query=Gao%2C+X">Xinxin Gao</a>, <a href="/search/physics?searchtype=author&query=Fu%2C+Z+H">Zhi Hui Fu</a>, <a href="/search/physics?searchtype=author&query=Chen%2C+J+Y">Jing Yu Chen</a>, <a href="/search/physics?searchtype=author&query=Lv%2C+J+M">Jie Ming Lv</a>, <a href="/search/physics?searchtype=author&query=Wang%2C+Z+X">Zheng Xing Wang</a>, <a href="/search/physics?searchtype=author&query=Wang%2C+S+R">Si Ran Wang</a>, <a href="/search/physics?searchtype=author&query=Wu%2C+J+W">Jun Wei Wu</a>, <a href="/search/physics?searchtype=author&query=Zhang%2C+Z">Zhen Zhang</a>, <a href="/search/physics?searchtype=author&query=Zhang%2C+J+N">Jia Nan Zhang</a>, <a href="/search/physics?searchtype=author&query=Li%2C+H+D">Hui Dong Li</a>, <a href="/search/physics?searchtype=author&query=Dai%2C+J+Y">Jun Yan Dai</a>, <a href="/search/physics?searchtype=author&query=Cheng%2C+Q">Qiang Cheng</a>, <a href="/search/physics?searchtype=author&query=Cui%2C+T+J">Tie Jun Cui</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2411.05690v1-abstract-short" style="display: inline;"> With the versatile manipulation capability, programmable metasurfaces are rapidly advancing in their intelligence, integration, and commercialization levels. However, as the programmable metasurfaces scale up, their control configuration becomes increasingly complicated, posing significant challenges and limitations. Here, we propose a multiple-partition cross-modulation (MPCM) programmable metasu… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.05690v1-abstract-full').style.display = 'inline'; document.getElementById('2411.05690v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2411.05690v1-abstract-full" style="display: none;"> With the versatile manipulation capability, programmable metasurfaces are rapidly advancing in their intelligence, integration, and commercialization levels. However, as the programmable metasurfaces scale up, their control configuration becomes increasingly complicated, posing significant challenges and limitations. Here, we propose a multiple-partition cross-modulation (MPCM) programmable metasurface to enhance the wireless communication coverage with low hardware complexity. We firstly propose an innovative encoding scheme to multiply the control voltage vectors of row-column crossing, achieving high beamforming precision in free space while maintaining low control hardware complexity and reducing memory requirements for coding sequences. We then design and fabricate an MPCM programmable metasurface to confirm the effectiveness of the proposed encoding scheme. The simulated and experimental results show good agreements with the theoretically calculated outcomes in beam scanning across the E and H planes and in free-space beam pointing. The MPCM programmable metasurface offers strong flexibility and low complexity by allowing various numbers and combinations of partition items in modulation methods, catering to diverse precision demands in various scenarios. We demonstrate the performance of MPCM programmable metasurface in a realistic indoor setting, where the transmissions of videos to specific receiver positions are successfully achieved, surpassing the capabilities of traditional programmable metasurfaces. We believe that the proposed programmable metasurface has great potentials in significantly empowering the wireless communications while addressing the challenges associated with the programmable metasurface's design and implementation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.05690v1-abstract-full').style.display = 'none'; document.getElementById('2411.05690v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 November, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2410.07576">arXiv:2410.07576</a> <span> [<a href="https://arxiv.org/pdf/2410.07576">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> </div> </div> <p class="title is-5 mathjax"> Simplified radar architecture based on information metasurface </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Wang%2C+S+R">Si Ran Wang</a>, <a href="/search/physics?searchtype=author&query=Chen%2C+Z+Y">Zhan Ye Chen</a>, <a href="/search/physics?searchtype=author&query=Chen%2C+S+N">Shao Nan Chen</a>, <a href="/search/physics?searchtype=author&query=Dai%2C+J+Y">Jun Yan Dai</a>, <a href="/search/physics?searchtype=author&query=Zhang%2C+J+W">Jun Wei Zhang</a>, <a href="/search/physics?searchtype=author&query=Qi%2C+Z+J">Zhen Jie Qi</a>, <a href="/search/physics?searchtype=author&query=Wu%2C+L+J">Li Jie Wu</a>, <a href="/search/physics?searchtype=author&query=Sun%2C+M+K">Meng Ke Sun</a>, <a href="/search/physics?searchtype=author&query=Zhou%2C+Q+Y">Qun Yan Zhou</a>, <a href="/search/physics?searchtype=author&query=Li%2C+H+D">Hui Dong Li</a>, <a href="/search/physics?searchtype=author&query=Luo%2C+Z+J">Zhang Jie Luo</a>, <a href="/search/physics?searchtype=author&query=Cheng%2C+Q">Qiang Cheng</a>, <a href="/search/physics?searchtype=author&query=Cui%2C+T+J">Tie Jun Cui</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2410.07576v1-abstract-short" style="display: inline;"> Modern radar typically employs a chain architecture that consists of radio-frequency (RF) and intermediate frequency (IF) units, baseband digital signal processor, and information display. However, this architecture often results in high costs, significant hardware demands, and integration challenges. Here we propose a simplified radar architecture based on space-time-coding (STC) information meta… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.07576v1-abstract-full').style.display = 'inline'; document.getElementById('2410.07576v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2410.07576v1-abstract-full" style="display: none;"> Modern radar typically employs a chain architecture that consists of radio-frequency (RF) and intermediate frequency (IF) units, baseband digital signal processor, and information display. However, this architecture often results in high costs, significant hardware demands, and integration challenges. Here we propose a simplified radar architecture based on space-time-coding (STC) information metasurfaces. With their powerful capabilities to generate multiple harmonic frequencies and customize their phases, the STC metasurfaces play a key role in chirp signal generation, transmission, and echo reception. Remarkably, the receiving STC metasurface can implement dechirp processing directly on the RF level and realize the digital information outputs, which are beneficial to lower the hardware requirement at the receiving end while potentially shortening the time needed for conventional digital processing. As a proof of concept, the proposed metasurface radar is tested in a series of experiments for target detection and range/speed measurement, yielding results comparable to those obtained by conventional methods. This study provides valuable inspiration for a new radar system paradigm to combine the RF front ends and signal processors on the information metasurface platform that offers essential functionalities while significantly reducing the system complexity and cost. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.07576v1-abstract-full').style.display = 'none'; document.getElementById('2410.07576v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 October, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">25 pages, 10 figures</span> </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a 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