A Monolayer Frequency‐Selective Surface for Wideband Shielding Application with Adequate Out‐of‐Band Separation and Angular Stability

In the proposed paper, a monolayer band‐stop frequency‐selective surface (FSS) is structured and analyzed for application in wideband shielding. The paper proposes an organized step‐by‐step method to design the frequency‐selective surface (FSS) to achieve enhanced shielding effectiveness (SE) over the entire band. The suggested FSS comprises of tripole‐shaped unit cells on both sides of a monolayer FR‐4 substrate to offer adequate shielding over the band of 3.2–8.82 GHz which includes both C‐ and X‐bands. The operating band of the FSS achieves ultrawideband shielding by means of 93% bandwidth with 60–100 dB shielding effectiveness. Experimental data are employed for the characteristics that are fairly well congruent to simulated results. Higher angular stability beyond 80° characterizes the proposed FSS. A wide range of potential uses for the proposed design exists, including microwave shielding, wideband filtering, as well as radar cross‐section (RCS) reduction, among others. The out‐of‐band RCS reduction capability of the FSS is also investigated and presented in this paper.