Design of a triple band notched polarization independent compact FSS at UWB frequency range

Abstract

The design of a compact triple band notched Frequency Selective surface (FSS) at Ultra-Wide-Band (UWB) frequency range is presented. To make the proposed FSS polarization insensitive, on the upper part of the substrate a single metallic square loop (SL) and four identical rotational symmetric square split ring resonators (SSRR 1 ) are placed, whereas at the bottom part another four identical rotational symmetric SSRR loops (SSRR 2 ) are printed. Here each SSRR is rotated in 90 clockwise direction over a single layered FR4 substrate.Triple band notches are obtained at WiMAX and Satellite communication downlink C-band (3.3-4.2 GHz), WLAN (5.1-5.9 GHz) and Satellite communication X-band (7.2-8.4 GHz) for both TE and TM polarizations. Angular stability is achieved until 70 and attenuation of more than 25 dB is observed at resonance. The passband is obtained at 4.37 and 6.22 GHz. The proposed structure separates the closely spaced frequency bands by a ratio of 1.44 and 1.39 at the stop band and 1.42 at the pass band. The dimensions of the proposed FSS unit cell are 0.13λ 0 × 0.13λ 0 × 0.020 λ 0 , where λ 0 represents the free space wavelength at the lowest resonance frequency. Good agreement between modeled and measured results is obtained.

Optically transparent and angularly stable broad‐stopband frequency selective surface for millimeter wave electromagnetic interference mitigation

“…Frequency selective surfaces (FSSs) are periodic structures consisting of planar metallic arrays on a dielectric substrate, designed to selectively transmit, reflect, and absorb electromagnetic waves at specific frequencies 1 . They find widespread applications in mitigating electromagnetic interference (EMI) across various communication bands, including GSM, 2 LTE‐2.1 GHz, 3 WLAN/WiMax, 4,5 and sub‐6 GHz in 5G new radio (NR), 6 often spanning multiple bands 7 . The ever advance of 5G NR communication has impelled the investigations into the millimeter wave (mmW) bands, such as n257 (26.5–29.5 GHz), n258 (24.25–27.5 GHz), and n260 (37–40 GHz) 8 .…”

A compact polarization independent stop band frequency‐selective surface for WLAN shielding

“…Single‐layer FSS unit cell is designed for UWB stop band performance in reference 17. Double‐layer FSS with SRR unit cells are designed to provide triple stop band in reference 18. Dual stop band FSS is designed with SRR elements with the connected patch at the center for X‐band applications in reference 19.…”

Design of compact dual‐band shared‐aperture antenna system based on frequency selective surface

“…In recent years, researchers have designed many FSSs with excellent performance. An ultrabroadband compact tri‐band notched FSS is proposed in Katoch et al, 14 which is angularly stable to 70° and has the attenuation of more than 25 dB at resonance. An active FSS is proposed in Abdollahvand et al, 15 which provides two reflection bands of 20 and 30 GHz in one biasing state, while in the second biasing state the frequency characteristics are switched in the X‐band.…”