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Synthesis method of lumped dual–band filters with controllable bandwidths
Author(s) -
Liu Yun,
Chen Yao,
Miao Xiyang,
Cui Chenwei,
Tang Yijun
Publication year - 2015
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.20825
Subject(s) - resonator , passband , equivalent circuit , multi band device , electronic engineering , microwave , admittance , rlc circuit , dual (grammatical number) , filter (signal processing) , capacitive sensing , band pass filter , topology (electrical circuits) , physics , engineering , electrical engineering , electrical impedance , voltage , capacitor , telecommunications , antenna (radio) , art , literature
This article presents a synthesis method for lumped dual‐band filters by directly adopting traditional Pi‐shaped and Г‐shaped capacitive networks as dual‐mode admittance inverters (J inverters). By following classic coupled‐resonator filter theory, the equivalent circuits (parallel LCs) of the dual‐mode resonators between the J inverters are derived separately at the two passbands. Each dual‐mode resonator is first approximately constructed with a series combination of the two parallel lumped circuit (LC) resonators, and then the element values are iteratively updated for better accuracy. A design example is given and good agreement is achieved between the simulated and measured results, demonstrating the feasibility of the synthesis method. The passband bandwidths are fully controllable. © 2014 Wiley Periodicals, Inc. Int J RF and Microwave CAE 25:75–80, 2015.