Quasi-Elliptic Bandpass Frequency Selective Surface Based on Coupled Stubs-Loaded Ring Resonators

Rui-Xiang Liao,Jing -Yu Lin,Bai-Yang Liu,Fu-Chang Chen,Sai-Wai Wong,Zhi Quan,Yin Li

doi:10.1109/access.2020.3003319

Rui-Xiang Liao, Jing -Yu Lin + Show 5 more

Open Access

https://doi.org/10.1109/access.2020.3003319

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Abstract

In this paper, a novel design of frequency-selective surface (FSS) based on coupled stubs-loaded ring resonators (SLRRs) is proposed. The proposed FSS exhibits quasi-elliptic bandpass filtering characteristic at C-band. And each unit cell of the structure is composed of two SLRRs coupled by a circular aperture. A novel method of transmission line (TL) model is proposed to investigate the operating principle of a single SLRR under normal incidence plane wave. Moreover, the operating mechanism of the proposed FSS is further researched with the aid of the equivalent circuit model (ECM) analysis method. Due to the symmetric and low-profile physical structure, the FSS keeps stable frequency response under oblique incident plane wave for both transverse electric (TE) and transverse magnetic (TM) polarizations. Finally, the designed FSS is fabricated and measured. The measured results agree well with the simulated results. The measured results indicate that the proposed FSS exhibits a dual-polarized and stable bandpass frequency response with two transmission zeros (TZs) at around 5.71 and 6.87 GHz under different incident angles up to 40°.

Highlights

Frequency-selective surfaces (FSSs) have been intensively researched as spatial filters over the past several decades [1], [2]
In [9], a bandpass FSS based on antenna-filter-antenna (AFA) module was presented
In [10], a quasi-elliptic bandpass FSS is designed based on the composition of metal cylinder pipes and circular patches

Summary

Introduction

Frequency-selective surfaces (FSSs) have been intensively researched as spatial filters over the past several decades [1], [2]. It makes a lot of sense to design bandpass FSSs with good performance like sharp rolloff, low-profile, and high frequency selectivity. Many approaches have been reported to design high perform bandpass FSS. In [9], a bandpass FSS based on antenna-filter-antenna (AFA) module was presented. A third-order bandpass filtering response was achieved by the two back-to-back microstrip patch antennas and the coplanar-waveguide (CPW) resonator in the middle layer. In [10], a quasi-elliptic bandpass FSS is designed based on the composition of metal cylinder pipes and circular patches. A type of low-profile FSS with non-resonant constituting elements was proposed in [11], [12]. The non-resonant elements are composed of capacitive sub-wavelength patches

Methods

Conclusion