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.
Bibliographical noteFunding 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: firstname.lastname@example.org; email@example.com).
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- high isolation
- substrate integrated waveguide (SIW)
ASJC Scopus subject areas
- Condensed Matter Physics
- Electrical and Electronic Engineering