Polarization-insensitive large-scanning-angle broadband-stop frequency-selective surface for electromagnetic shielding

An ultra-wideband reject, polarization-insensitive patch-type frequency-selective surface (FSS) with great angular stability is designed, and results are well demonstrated. The proposed FSS is fabricated on single-layer FR4 substrate with a compact size of 0.083λ0×0.083λ0×0.013λ0\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$0.083\lambda_0 \times 0.083\lambda_0 \times 0.013\lambda_0$$\end{document}. The proposed FSS covered the complete ultra-wide frequency band of 2.5–16.24 GHz. The covered <-10dB\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$< -10\,{\text{dB}}$$\end{document} and <-20dB\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$< -20\,{\text{dB}}$$\end{document} fraction bandwidths are 146.63% and 76.67%. The proposed FSS is polarization-insensitive and offers angular stability up to 80°. The measured results are compared with the reported ultra-wideband FSSs in the literature to establish the novelty of this work.