Open AccessDual‐band bandpass filter using two simple coupled microstrip rings
Author(s) -
Xu Jiashuai,
Xu KaiDa,
Zhang Miao,
Chen Qiang
Publication year - 2021
Publication title -
engineering reports
Language(s) - English
Resource type - Journals
ISSN - 2577-8196
DOI - 10.1002/eng2.12288
Subject(s) - band pass filter , stopband , microstrip , passband , multi band device , topology (electrical circuits) , physics , electrical impedance , electronic engineering , materials science , computer science , optics , telecommunications , electrical engineering , engineering , antenna (radio) , quantum mechanics
A new dual‐band bandpass filter ( BPF ) using two very simple coupled microstrip rings is proposed in this paper. The two identical 3 λ g /2 microstrip rings are coupled each other with λ g /2 coupled length, resulting in the generation of dual frequency bands with multiple transmission zeros ( TZs ). Theoretical deduction is presented to verify the proposed structure. The center frequencies and bandwidths of the two passbands can be tuned by controlling the impedance parameters of the microstrip rings. For demonstration, a prototype example of this dual‐band BPF is fabricated and characterized. The measured results show that it has high selectivity and great return losses of passbands with multiple TZs at the stopband.