High Isolation Substrate Integrated Waveguide Diplexer with Flexible Transmission Zeros

Fei Cheng*, Chao Gu, Bing Zhang, Yang Yang, Kama Huang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)
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This letter presents a high isolation substrate integrated waveguide (SIW) diplexer using dual-mode resonators. Each dual-mode SIW resonator can generate one transmission pole (TP) and one transmission zero (TZ) for the channel filter. The frequencies of the TZs can be easily controlled by the perturbation vias. One channel filter's two TZs' frequencies are designed to cover the other channel filter's passband. Thus, high isolation performance is achieved. The proposed diplexer is designed and fabricated with lower and upper channels centered at 8.04 and 9.07 GHz, respectively. Simulated and measured results are in good agreement for the two channels with better than 49/53-dB channel isolation.

Original languageEnglish
Pages (from-to)1029-1032
Number of pages4
JournalIEEE Microwave and Wireless Components Letters
Issue number11
Early online date01 Oct 2020
Publication statusEarly online date - 01 Oct 2020

Bibliographical note

Funding Information:
Manuscript received June 29, 2020; revised August 24, 2020; accepted September 18, 2020. Date of publication October 1, 2020; date of current version November 6, 2020. This work was supported in part by the National Natural Science Foundation of China under Grant 61801317 and in part by the Fundamental Research Funds for the Central Universities. (Corresponding author: Yang Yang.) Fei Cheng, Bing Zhang, Yang Yang, and Kama Huang are with the College of Electronics and Information Engineering, Sichuan University, Chengdu 610065, China (e-mail: chengfei@scu.edu.cn; yyang@scu.edu.cn).

Publisher Copyright:
© 2001-2012 IEEE.

Copyright 2020 Elsevier B.V., All rights reserved.


  • Diplexer
  • dual-mode
  • high isolation
  • substrate integrated waveguide (SIW)

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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