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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.

This paper presents an ultraminiaturized bandstop closed‐loop 2.5D frequency‐selective surface (FSS) for sub‐6 GHz 5G wireless communication. Four metallic vertical vias interconnect metallic elements present on both sides of the substrate to form a modified closed‐loop design. The proposed structure band stops the entire sub‐6 GHz 5G band (C‐band/NR N78 band/LTE 42/43 band) ranging from 3.2 to 3.9 GHz with a resonant notch at 3.62 GHz. This design supports polarization insensitivity and procures maximum relative deviation of 0.5% and 0.2% at 80°incident transverse electric (TE) and transverse magnetic (TM) polarized waves, respectively. The proposed FSS prototype has been fabricated and tested. Experimentally, the resonant notch is obtained at 3.55 and 3.68 GHz under TE and TM normal incident polarized waves, respectively. Moreover, good agreement in the frequency response curves is observed between simulated and measured results. The proposed unit cell is 3.6 × 3.6 mm2 in dimensions, which is 0.04λ × 0.04λ, where λ is the resonant wavelength.

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