Premium
Compact dual‐band bandpass filter and diplexer using hybrid resonant structure with independently controllable dual passbands
Author(s) -
Ren Baoping,
Liu Haiwen,
Ma Zhewang,
Ohira Masataka,
Guan Xuehui,
Wen Pin,
Wang Xiaolong
Publication year - 2019
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.21435
Subject(s) - diplexer , band pass filter , resonator , stub (electronics) , passband , physics , multi band device , dual mode , microstrip , coupling (piping) , electronic engineering , topology (electrical circuits) , optoelectronics , materials science , optics , computer science , telecommunications , electrical engineering , engineering , antenna (radio) , metallurgy
In this article, a compact dual‐band bandpass filter (BPF) is developed using a hybrid resonant structure, which consists of a microstrip stub‐loaded dual‐mode resonator and a slotline stub‐loaded dual‐mode resonator. These two resonators, both having two controllable resonant modes and one transmission zero (TZ), are analyzed and used to construct two desired passbands of a dual‐band BPF. Multiple TZs are generated by introducing a source‐load coupling, thus improving the selectivity of the passbands. Then, the dual‐band BPF is reshaped to configure a compact diplexer. The inherent TZs of the two proposed resonators are designed to improve the frequency property and port isolation of the diplexer. Finally, a dual‐band BPF and a diplexer with the lower and upper passbands centered at 2.45 and 3.45 GHz, respectively, are designed, fabricated, and measured to verify the proposed structure and method.