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Compact microstrip dual‐band bandpass filter using short‐circuited stub‐loaded open loop resonators
Author(s) -
Ma XingBing,
Zhang FengShan
Publication year - 2014
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.28407
Subject(s) - stub (electronics) , resonator , passband , band pass filter , microstrip , microwave , physics , wideband , optoelectronics , electronic engineering , acoustics , materials science , topology (electrical circuits) , engineering , optics , electrical engineering , telecommunications
In this article, a compact dual‐band microstrip bandpass filter is proposed using two short‐circuited stub‐loaded open loop resonators and two common open loop resonators. The short‐circuited stub‐loaded resonators can generate two resonant modes. Under odd mode, the short‐circuited stub at the central does not affect the resonant frequencies, and four resonators tightly coupling with each other work at the same frequencies, a wideband passband is obtained. Whereas under the even mode, considering the influences from short‐circuited stubs, the resonant frequencies are decided only by two short‐circuited stub‐loaded resonators, two common resonators are seen as parts of feedlines connected to 50 Ω. A new transmission zero is created between two passbands to improve the selectivity. Good agreement is achieved between simulation and measurement. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:1651–1653, 2014