Design and analysis of varactor‐loaded bi‐state switchable active artificial magnetic conductor reflector for wearable antenna integration

Anil Badisa; Boddapati Taraka Phani Madhav; Sudipta DasMyla Chimpiri Rao

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Design and analysis of varactor‐loaded bi‐state switchable active artificial magnetic conductor reflector for wearable antenna integration

机译：Design and analysis of varactor‐loaded bi‐state switchable active artificial magnetic conductor reflector for wearable antenna integration

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摘要

A low profile, bi‐state switchable, and flexible active AMC (AAMC) reflector metasurface is presented for wearable antenna integration to improve radiation performance with low specific absorption rate (SAR). The unit cell structure contains concentric rectangular rings with 2‐varactor diodes. The unit cell is designed on a flexible PDMS substrate with dimensions 20 × 20 × 1 mm3. Controlled DC bias is applied to both varactor diodes. In state‐1, that is, on state, the AMC surface resonates at 3.5, 5.8, and 8.1 GHz frequency, and in state‐2, that is, off state, it resonates at 3.5, 5.8, and 7.5 GHz frequencies with zero degrees reflection phase. The proposed AAMC reflector performance is analyzed by integrating a 3 × 3 AAMC surface with the quad‐band wearable textile antenna designed to resonate at 3.5, 5.8, 7.5, and 8.1 GHz frequencies. By controlling operating voltages of the integrated AAMC, the antenna radiation performance is improved in bi‐state by adapting to reflection pattern switching. In On‐state, the peak gain (dBi), FBR (dB) of integrated antenna improved to 7.36, 9.05, 8.9, 7.53 and 9.25, 11.9, 19.7, 16.70; In Off‐state, the values are improved to 7.8, 8.98, 8.33, 7.92 and 12.24, 11.37, 14.6, 16.85, respectively. The proposed AAMC with antenna integration is fabricated, and its measured results are well satisfying. The low SAR values are obtained under a 2 mm gap (<0.924 W/kg) and direct contact (<1.5 W/kg) as well. The enhanced radiation performance characteristics with the bi‐state switchable feature make it preferable for wearable antenna integration to meet current WBAN demands.

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来源
《International journal of RF and microwave computer-aided engineering》 |2022年第4期|23047-n/a|共16页
作者
Anil Badisa; Boddapati Taraka Phani Madhav; Sudipta DasMyla Chimpiri Rao;
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作者单位

Koneru Lakshmaiah Education Foundation;

IMPS College of Engineering & Technology;

Andhra Loyola College;

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原文格式 PDF
正文语种英语
中图分类微波电子管;计算技术、计算机技术;
关键词
active artificial magnetic conductor; bi‐state switchable; PDMS; SAR; varactor diode; wearable antenna integration;

Design and analysis of varactor‐loaded bi‐state switchable active artificial magnetic conductor reflector for wearable antenna integration

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