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Design of a novel miniaturized bandstop frequency selective surface exhibiting polarization insensitivity and enhanced oblique stability
Author(s) -
Abidin Zain Ul,
Cao Qunsheng,
Shah Gulab,
Azeem Muhammad
Publication year - 2020
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.22263
Subject(s) - tunable metamaterials , fractional bandwidth , bandwidth (computing) , materials science , oblique case , wavelength , polarization (electrochemistry) , optics , band stop filter , selective surface , wideband , optoelectronics , acoustics , electronic engineering , computer science , physics , metamaterial , engineering , telecommunications , low pass filter , resonator , linguistics , philosophy , chemistry
Abstract In this article, a miniaturized 2.5‐dimensional frequency selective surface (FSS) bandstop filter operating at 2.4 GHz is presented. The proposed FSS contains meander lines as well as metallic patches on top and bottom layer of FR‐4 substrate, and vertical vias are employed to connect the top and the bottom layers. The proposed configuration significantly reduced the size of unit cell to 0.040 λ 0 × 0.040 λ 0 (where λ 0 is the free space wavelength) at the desired frequency of 2.4 GHz. Additionally, this element arrangement assists in achieving fractional bandwidth of 140%. The measured −10 dB bandwidth is from 1 to 4.5 GHz. The proposed FSS is polarization insensitive and highly angularly stable (up to 75°). The equivalent circuit model (ECM) of this FSS and related surface current distribution are also provided to understand its working mechanism. The design performance validation has been carried out through the construction and testing of a functional prototype. The full wave simulation, the ECM, and the measured results depict a promising agreement.