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<p>This study presents a simple design of a bandpass frequency selective surface (FSS) that achieves high optical transparency (OT), stability under varying incident angle, and enhanced electromagnetic wave transmission with a wide selective bandwidth, specifically intended for glass windows in 5G mm-wave wireless communication (n257, n258, and n261 frequency bands). These FSS structures, applied to glass windows and referred to as glass-penetrating transparent surfaces (GPTS), are designed using meta-surface technology to remain visually unobtrusive in environments where signal transmission control is required. To optimize the OT of 61%, square loop (SL) and grid wire (GW) structures were employed, both utilizing miniaturized metallics. These elements were vertically stacked to minimize the impact of metallic coverage on transparency, resulting in a three-layer FSS configuration with an SL/GW/SL arrangement. Strong interlayer coupling is generated between the layers, enhancing both the transmission, with a peak insertion loss of 0.74 dB at the center frequency (27&#xa0;GHz), and the − 3dB bandwidth (BW) achieving 5&#xa0;GHz (24.6–29.6&#xa0;GHz, 18.4%). Additionally, the proposed design features a compact unit cell size of 0.148<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\:{{\uplambda\:}}_{0}\)</EquationSource> </InlineEquation> <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\:\times\:\)</EquationSource> </InlineEquation> 0.148<InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(\:{{\uplambda\:}}_{0}\)</EquationSource> </InlineEquation> and a symmetric configuration, which contributes to stable performance under various incident angles up to 45<InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(\:^\circ\:\)</EquationSource> </InlineEquation>. Results indicate that the proposed FSS design holds promise as an effective solution for mm-wave signal filtering on glass windows, providing conditions for high data-rate communications.</p>

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Transparent Wide-Bandpass FSS with High Selectivity on Windows Glass for mm-Wave Wireless Communication

  • 期刊论文

  • 发表日期：

    2025年11月14日

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  • Dat Tien Nguyen,
  • Chang Won Jung

摘要

This study presents a simple design of a bandpass frequency selective surface (FSS) that achieves high optical transparency (OT), stability under varying incident angle, and enhanced electromagnetic wave transmission with a wide selective bandwidth, specifically intended for glass windows in 5G mm-wave wireless communication (n257, n258, and n261 frequency bands). These FSS structures, applied to glass windows and referred to as glass-penetrating transparent surfaces (GPTS), are designed using meta-surface technology to remain visually unobtrusive in environments where signal transmission control is required. To optimize the OT of 61%, square loop (SL) and grid wire (GW) structures were employed, both utilizing miniaturized metallics. These elements were vertically stacked to minimize the impact of metallic coverage on transparency, resulting in a three-layer FSS configuration with an SL/GW/SL arrangement. Strong interlayer coupling is generated between the layers, enhancing both the transmission, with a peak insertion loss of 0.74 dB at the center frequency (27 GHz), and the − 3dB bandwidth (BW) achieving 5 GHz (24.6–29.6 GHz, 18.4%). Additionally, the proposed design features a compact unit cell size of 0.148 \(\:{{\uplambda\:}}_{0}\) \(\:\times\:\) 0.148 \(\:{{\uplambda\:}}_{0}\) and a symmetric configuration, which contributes to stable performance under various incident angles up to 45 \(\:^\circ\:\) . Results indicate that the proposed FSS design holds promise as an effective solution for mm-wave signal filtering on glass windows, providing conditions for high data-rate communications.