A Novel FSS-Based Bandstop Filter for TE/TM Polarization

IF 0.9 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Letters on Electromagnetic Compatibility Practice and Applications Pub Date : 2023-10-24 DOI:10.1109/LEMCPA.2023.3327027

Sourodipto Das;Anil Rajput;Biswajeet Mukherjee

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Abstract

A novel miniaturized unit-cell frequency-selective surface (FSS)-based bandstop filter (BSF) is presented in this letter. The proposed structure exhibits negative refractive index (NRI) characteristics by designing an epsilon-negative FSS. This design gives a 10-dB rejection bandwidth from 3.13 to 4.75 GHz and its unit cell has an electrical length of

$0.125\,\,\lambda _{0} \times 0.125\,\,\lambda _{0}$

. In addition, the designed BSF has a center frequency of 3.96 GHz and an NRI value for a range of 220 MHz, starting from 4.07 to 4.29 GHz. Furthermore, its equivalent circuit model and surface current distribution are elucidated to explain the behavior of the proposed FSS. The structure manifests polarization-independent characteristics and provides a stable frequency response for normal and oblique angles under both transverse electric (TE) and transverse magnetic (TM) incident polarization. To validate the results, the BSF is fabricated, and good agreement between the simulated and measured responses is observed.

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基于 FSS 的新型 TE/TM 偏振带阻滤波器

本信介绍了一种基于单元单元频率选择表面（FSS）的新型微型带阻滤波器（BSF）。通过设计ε-负的 FSS，所提出的结构具有负折射率（NRI）特性。这种设计提供了从 3.13 到 4.75 GHz 的 10 分贝抑制带宽，其单元格的电长度为 0.125 （,\,\lambda _{0} ）乘以 0.125 （,\,\lambda _{0} ）。\此外，所设计的 BSF 的中心频率为 3.96 GHz，NRI 值范围为 220 MHz（从 4.07 GHz 到 4.29 GHz）。此外，还阐明了其等效电路模型和表面电流分布，以解释拟议 FSS 的行为。在横向电（TE）和横向磁（TM）入射极化下，该结构表现出与极化无关的特性，并在正交和斜交角度下提供稳定的频率响应。为了验证结果，我们制作了 BSF，并观察到模拟响应与测量响应之间的良好一致性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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IEEE Letters on Electromagnetic Compatibility Practice and Applications

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