Design of conformal dual stop band frequency selective surface for microwave applications
Year: 2025
Type: article
Abstract: A Conformal single layer ultra-thin dual band stop and bandpass Frequency Selective Surface (FSS) for microwave applications is proposed and experimentally evaluated in this letter. The proposed FSS uniquely combines dual passband functionality allowing the lower and upper WLAN spectra—with dual stopband performance that delivers wideband, wide-angle, and polarization-independent shielding for TE and TM polarizations. The proposed FSS consists of two Concentric Square Rings (CCSR) and two Convoluted Square Rings (CVSR) on a Rogers 3010 substrate of relative permittivity 10.2 and thickness 0.25 mm. The dimension of the unit cell is 0.1123 λo ×0.1123 λo, λo is the lowest resonant frequency. Planar and conformal FSS structures were systematically analyzed, fabricated, and characterized in an anechoic chamber to evaluate their passband performance and shielding effectiveness. The proposed FSS exhibits dual wide stopband characteristics ranging from 1.05 – 1.75GHz, 3.4 – 4.6 GHz with shield effectiveness of 51dB and 45 dB at 1.4 GHz, 4.06GHz respectively. It also exhibits dual pass band response from 2.2 – 2.5GHz and 5.4 – 5.9GHz within band with insertion loss of 0.8dB and 0.5dB respectively. It also exhibits outstanding angular and polarization stability up to 80 degrees. The close correlation between simulated and measured transmission responses validates the design’s effectiveness in shielding the L band and 5G NR spectrum while maintaining high transmission in the lower and upper WLAN frequency bands.
Source: Physics Open
Authors: Naveena Meka, Krishnan Shambavi
Institution: Vellore Institute of Technology University
Language: English
Subfield: Aerospace Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,700
OpenAlex ID: W4416702807