Design and analysis of wideband bandpass three-dimensional frequency selective surface

Abstract

Abstract: A wideband bandpass three-dimensional frequency selective surface (3D FSS) is proposed based on the square waveguide structure. The unit cell of the proposed FSS consists of a cuboid dielectric block with two identically-sized metallic square patches on the top and bottom surfaces and an air-filled square waveguide, in which each surface provides a square slot resonant structure.Theoriginal single resonant mode of the square slot resonance will split into even- or odd- resonant modes by the electromagnetic coupling. Thus, two transmission poles are introduced for obtaining a flat passband with second-order response, and its 3 dB fractional bandwidth of the passband is 25.12%.The operating principle of the proposed FSS is explained by the equivalent circuit model. The simulated results show that the proposed FSS exhibits a stable response to variations of incident angle from 0° to 45° under both TE and TM polarizations. In addition, this 3D FSS has a relatively small unit cell.

Key words: frequency selective surface (FSS), wideband, bandpass, equivalent circuit model (ECM), three-dimensional (3D)

CLC Number:

TN713

YU Zheng-yong, ZHU Jian-ping, TANG Wan-chun. Design and analysis of wideband bandpass three-dimensional frequency selective surface[J]. Journal of Lanzhou University of Technology, 2021, 47(3): 86-90.

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