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Indexed by:Journal Papers

Date of Publication:2020-04-01

Journal:IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION

Included Journals:SCIE

Volume:68

Issue:4

Page Number:2975-2983

ISSN No.:0018-926X

Key Words:Resonators; Frequency selective surfaces; Equivalent circuits; Band-pass filters; Integrated circuit modeling; Frequency response; Resonant frequency; Angular stability; fast roll-off; frequency selective surface (FSS); radome; wideband rejection

Abstract:In this article, we proposed an equivalent circuit-based design to synthesizing second-order band-pass frequency selective surfaces (FSSs) with wide out-of-band rejection and fast roll-off characteristics. An equivalent circuit model (ECM) is established in order to depict the desired frequency response. Then, based on the ECM, a generalized composite structure comprised of three FSS arrays separated by two dielectric substrates is proposed. The main advantage of this method is that it allows us to acquire optimized structural parameters according to the desired frequency response. With this method, an FSS based on the proposed composite structure is designed. The designed FSS can provide a second-order pass-band within the stop-band ranging from 1 to 40 GHz and the pass-band is operating at 10 GHz with 12% fractional bandwidth. Meanwhile, the bandwidth of the two transitional bands on both sides of the pass-band is only 0.26 and 0.6 GHz, respectively. Also, the frequency response of the designed FSS is stable at 60 degrees for both TE and TM polarizations. For further verification, an FSS prototype is fabricated and experimentally characterized. Good agreements between the simulated and measured results can be observed.