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A wide stopband multilayer substrate integrated waveguide bandpass filter with suppression of higher-order mode coupling

Published online by Cambridge University Press:  02 February 2021

Cong Tang
Affiliation:
Southwest China Institute of Electronic Technology, Chengdu, 610000, China
Fei Cheng*
Affiliation:
Key Laboratory of Wireless Power Transmission Ministry of Education, College of Electronics and Information Engineering, Sichuan University, Chengdu610065, China
Chao Gu
Affiliation:
Centre for Wireless Innovation, ECIT Institute, Queen's University Belfast, BelfastBT3 9DT, UK
*
Author for correspondence: Fei Cheng, E-mail: chengfei@scu.edu.cn

Abstract

This paper presents a compact multilayer substrate integrated waveguide (SIW) bandpass filter with wide stopband. The square SIW cavity resonators in multilayer substrates are horizontally and vertically coupled with magnetic coupling. By properly designing the coupling structure, the couplings between the higher-order resonant modes can be suppressed. Compared with the conventional single-layer SIW filters, the proposed multilayer SIW filter also exhibits a compact size. To verify the design concept, a double-layered SIW filter is fabricated and measured. The measured results agree well with the simulations. The measured results show that the upper stopband of the filter is extended to 2.73 times of the center frequency 8.02 GHz.

Type
Filters
Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press in association with the European Microwave Association

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