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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2024-04-14
A 1-Bit Metasurface with Adjustable Focus Achieved by Rotating Array
By
Bo Yin,

    Dr. Bo Yin

    College of Electronic Engineering

    Chongqing University of Post and Telecommunications

    China

    Homepage

Shubin Wang,

    Dr. Shubin Wang

    School of Optoelectronic Engineering

    Chongqing University of Posts and Telecommunications

    China

    Homepage

Yun Li,

    Dr. Yun Li

    China Coal Technology & Engineering Group Chongqing Rearch Institute Co., Ltd

    China

    Homepage

Hao Zhang

    Dr. Hao Zhang

    China Coal Technology & Engineering Group Chongqing Rearch Institute Co., Ltd

    China

    Homepage

Progress In Electromagnetics Research M, Vol. 126, 127-136, 2024
doi:10.2528/PIERM24020106 | Google Scholar

Abstract
The application scenarios of near-field focusing metasurfaces usually require scanning the target area. Passive metasurface requires a turntable to complete scanning due to its limited functionality. The active metasurface typically has a high cost because it needs to load PIN diodes. To address this issue, the article introduces a 1-bit reconfigurable metasurface that can achieve multi-focus tunability under fixed polarization through a rotating array. The 1-bit polarization-independent metasurface unit consists of three layers of metal. The top layer of the unit consists of three rectangular patches in the X-direction, the middle layer is a cross-shaped patch structure, and the bottom layer is a metal ground. The cross-shaped structure in the middle layer can easily provide the 1-bit reflection phase required for two orthogonal polarizations independently. Using a vertically polarized horn to illuminate the metasurface, the top layer's X-direction rectangular patches do not provide phase for vertical polarization. By rotating the array where the cross-shaped patches are located by 90°, the phase shift provided can achieve two focal points. On this basis, rotate the upper array by 90°, making the rectangular patches change from the X-direction to the Y-direction. Meanwhile, the current of the cross-shaped patches is blocked under vertical polarization illumination. By changing the upper rectangular patches, a third independent phase can be provided. After size optimization, a third focus can be formed. The proposed 1-bit focusing-adjustable metasurface array has a simple structure, low cost, and enhanced utilization rate of the metasurface array. It has a high application prospect in projects such as microwave imaging.
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Citation
Bo Yin, Shubin Wang, Yun Li, and Hao Zhang, "A 1-Bit Metasurface with Adjustable Focus Achieved by Rotating Array," Progress In Electromagnetics Research M, Vol. 126, 127-136, 2024.
doi:10.2528/PIERM24020106
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