Vol. 97

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2021-04-22

An Inline Quarter-Mode SIW Bandpass Filter Based on Frequency-Dependent Coupling Structures with Controllable Transmission Zeros

By Zhiwei Shi, Guo Hui Li, Yulu Song, and Binbin Cheng
Progress In Electromagnetics Research Letters, Vol. 97, 141-148, 2021
doi:10.2528/PIERL21021803

Abstract

An inline quarter-mode substrate integrated waveguide (QMSIW) filter with controllable finite transmission zeros (FTZs) is presented based on a novel frequency-dependent coupling structure, which is constructed by a microstrip line with a pair of symmetric metallized via/buried holes and a magnetic coupling iris between two resonant cavities. FTZ can be independently introduced and controlled on both sides of passband to achieve high selectivity while keeping the filter compact configuration unchanged. For demonstration, the proposed structure is analyzed in detail. An inline fourth-order QMSIW bandpass filter (BPF) with two upper FTZs is designed, fabricated, and measured. The synthesis results, EM results, and measured results are in accordance with each other, which confirms the effectiveness of the proposed method.

Citation


Zhiwei Shi, Guo Hui Li, Yulu Song, and Binbin Cheng, "An Inline Quarter-Mode SIW Bandpass Filter Based on Frequency-Dependent Coupling Structures with Controllable Transmission Zeros," Progress In Electromagnetics Research Letters, Vol. 97, 141-148, 2021.
doi:10.2528/PIERL21021803
http://jpier.org/PIERL/pier.php?paper=21021803

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