NDLI: Compact three-dimensional bandpass FSS with high selectivity based on split square coaxial waveguide

Content Provider	IET Digital Library
Author	Yu, Zhengyong Yang, Xia Tang, Wanchun Shi, Yongrong Zhu, Jianping Wang, Cheng
Abstract	In this Letter, a compact three-dimensional (3D) frequency selective surface (FSS), exhibiting a bandpass filtering response with high selectivity, is proposed based on the split square coaxial waveguide (SSCW). The unit cell of the presented 3D FSS consists of one parallel-plate waveguide propagation path and one SSCW propagation path. In the SSCW path, two identical short SCWs are produced by employing a centred annular slot. Each short SCW intrinsically provides a square slot resonance. Owing to the electromagnetic coupling between these two square slot resonances, original single square slot resonant mode will split into even-/odd-resonant modes, resulting in a flat passband with two transmission poles. Moreover, two transmission zeros located at both sides of the passband are introduced for high selectivity, because the electromagnetic waves passing through these two different paths are combined out of phase. By investigating the electric-field distributions at the frequencies of the transmission zeros/poles, the operating principle of the proposed 3D FSS is described. A prototype of the proposed 3D FSS is fabricated and measured. The measured results show that the proposed design can achieve a stable response under the incident angles up to 60° for both TE and TM polarisations.
Starting Page	1135
Ending Page	1137
Page Count	3
ISSN	00135194
Volume Number	55
e-ISSN	1350911X
Issue Number	Issue 21, Oct (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/el/55/21
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/el.2019.2189
Journal	Electronics Letters
Publisher Date	2019-09-03
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	3D FSS Band-pass Filter Bandpass Filtering Response Centred Annular Slot Coaxial Waveguides Compact Three-dimensional Bandpass FSS Electric-field Distributions Electromagnetic Coupling Electromagnetic Wave Even-resonant Mode Frequency Selective Surface Identical Short SCWs Incident Angles Microwave Material Odd-resonant Mode Original Single Square Slot Resonant Mode Parallel Plate Waveguide Parallel-plate Waveguide Propagation Path Passive Filter Passive Network Poles And Zeros Resonator Filter Split Square Coaxial Waveguide SSCW Propagation Path TE Polarisation Three-dimensional Frequency Selective Surface TM Polarisation Transmission Poles Transmission Zero Unit Cell Waveguide And Microwave Transmission Line Component Waveguide Filter
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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