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<p>We present the design and analysis of a polarization-insensitive, angular stable, conformal, miniaturized stopband frequency&#xa0;selective surface (FSS) for fifth-generation (5G), n258 (26&#xa0;GHz) band electromagnetic (EM) shielding applications. The unit cell of the FSS comprises a basic square-loop resonator with four stub arms placed on inside of each edge. The optimized FSS resonates at 26.02&#xa0;GHz, with a bandwidth (BW) of 7.43&#xa0;GHz (21.96–29.39&#xa0;GHz), effectively covering the desired 5G n258 band. The presented FSS exhibits a stable frequency response, enabling a well BW stability merit across a wide range of incidence angles, from 0° to 80°, for both transverse electric (TE) and transverse magnetic (TM) polarizations. Due to the thin-profile flexible substrate, FSS provides a high conformity and maintains a stable transmission response up to 180° conformal angle. To validate the simulation results, an equivalent circuit model was determined, and measurements were performed on a manufactured prototype of the FSS. And good agreement is observed between the full wave and equivalent circuit simulations, and measurement results. Finally, the novel FSS is proposed as a potential candidate for n258 band electromagnetic interference (EMI) shielding, owing to its presented advantages.</p>

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A conformal miniaturized frequency selective surface with high angular stability for EMI shielding in 5G n258 band applications

  • 期刊论文

  • 发表日期：

    2025年8月31日

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  • Nigar Berna Teşneli,
  • Fehmi Sandıkçı

摘要

We present the design and analysis of a polarization-insensitive, angular stable, conformal, miniaturized stopband frequency selective surface (FSS) for fifth-generation (5G), n258 (26 GHz) band electromagnetic (EM) shielding applications. The unit cell of the FSS comprises a basic square-loop resonator with four stub arms placed on inside of each edge. The optimized FSS resonates at 26.02 GHz, with a bandwidth (BW) of 7.43 GHz (21.96–29.39 GHz), effectively covering the desired 5G n258 band. The presented FSS exhibits a stable frequency response, enabling a well BW stability merit across a wide range of incidence angles, from 0° to 80°, for both transverse electric (TE) and transverse magnetic (TM) polarizations. Due to the thin-profile flexible substrate, FSS provides a high conformity and maintains a stable transmission response up to 180° conformal angle. To validate the simulation results, an equivalent circuit model was determined, and measurements were performed on a manufactured prototype of the FSS. And good agreement is observed between the full wave and equivalent circuit simulations, and measurement results. Finally, the novel FSS is proposed as a potential candidate for n258 band electromagnetic interference (EMI) shielding, owing to its presented advantages.