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Ultra-compact quasi-elliptic bandpass filter based on capacitive-loaded eighth-mode SIW cavities

Published online by Cambridge University Press:  09 September 2019

Qing Liu Open the ORCID record for Qing Liu [Opens in a new window] ,
Dongfang Zhou ,
Dewei Zhang ,
Chenge Bian  and
Yi Zhang
Qing Liu*
Affiliation:
Department of Electromagnetic Wave and Antenna Propagation, National Digital Switching System Engineering and Technological Research Center, Zhengzhou, Henan 450001, China
Dongfang Zhou
Affiliation:
Department of Electromagnetic Wave and Antenna Propagation, National Digital Switching System Engineering and Technological Research Center, Zhengzhou, Henan 450001, China
Dewei Zhang
Affiliation:
Department of Electromagnetic Wave and Antenna Propagation, National Digital Switching System Engineering and Technological Research Center, Zhengzhou, Henan 450001, China
Chenge Bian
Affiliation:
Department of Electromagnetic Wave and Antenna Propagation, National Digital Switching System Engineering and Technological Research Center, Zhengzhou, Henan 450001, China
Yi Zhang
Affiliation:
Department of Electromagnetic Wave and Antenna Propagation, National Digital Switching System Engineering and Technological Research Center, Zhengzhou, Henan 450001, China
*
Author for correspondence: Qing Liu, E-mail: liuqing8123@163.com
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Abstract

This paper reports a novel fourth-order quasi-elliptic bandpass filter (BPF) based on capacitive-loaded eighth-mode substrate integrated waveguide (CLEMSIW) cavities. The CLEMSIW cavity is constructed by the conventional eighth-mode SIW with two dielectric substrates and three metal layers; a metal via is employed to connect the middle and bottom metal layers. The middle metal layer achieves a large loading capacitance to shift the resonance frequency. The proposed filter is designed in a quadruple scheme, and two controllable finite-transmission zeros can be realized. For the demonstration, a prototype with a center frequency of 1 GHz and a fractional bandwidth of 10% was designed, fabricated, and measured. The measured results agree well with simulated ones. The proposed filter has advantages of ultra-compact size, high selectivity, and good stopband performances.

Keywords

Filterspassive components and circuitssubstrate integrated waveguide
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 12 , Issue 2 , March 2020 , pp. 109 - 115
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2019 

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