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Keywords = postwall slotline

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8 pages, 2503 KiB  
Article
Postwall-Slotline Stepped Impedance Resonator and Its Application to Bandpass Filter with Improved Upper Stopband
by Liang Yang, Cheng Lu, Jialin Wang, Shunli Li, Hongxin Zhao and Xiaoxing Yin
Electronics 2022, 11(6), 851; https://doi.org/10.3390/electronics11060851 - 9 Mar 2022
Viewed by 2452
Abstract
In this letter, a postwall-slotline stepped impedance resonator (PWS-SIR) is proposed and applied to a bandpass filter (BPF) with a wide stopband. The proposed PWS-SIR-BPF comprises three U-shaped PWS-SIRs and two microstrip-slot feeding transitions. A PWS has a much lower impendence which a [...] Read more.
In this letter, a postwall-slotline stepped impedance resonator (PWS-SIR) is proposed and applied to a bandpass filter (BPF) with a wide stopband. The proposed PWS-SIR-BPF comprises three U-shaped PWS-SIRs and two microstrip-slot feeding transitions. A PWS has a much lower impendence which a conventional slotline (CSL) cannot reach, so a much smaller impendence ratio of the PWS-SIR can be achieved. Consequently, a wider stopband simultaneously can be realized for the proposed filter. The designed PWS-SIR-BPF, as well as a CSL-BPF, have been fabricated, measured, and compared to verify the features of the PWS-SIR. The measured results are consistent with the simulation ones. The PWS-SIR is 7.3 mm (0.22λ0) long, 67% of 11.1 mm (0.34λ0) of the CSL resonator. The first spurious resonance frequency of the PWS-SIR-BPF is extended from 9.8 GHz (2f0) to 23 GHz (4.7f0). Full article
(This article belongs to the Section Microwave and Wireless Communications)
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