Open AccessCompact fully‐canonical dual‐band bandpass filter with independently controllable bandwidths
Author(s) -
Zhang Fan,
Gao Yang,
Wang Yi,
Zhang Yi,
Dong Yuliang,
Xu Jun
Publication year - 2021
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/ell2.12027
Subject(s) - band pass filter , resonator , topology (electrical circuits) , filter (signal processing) , physics , multi band device , inductive coupling , bandwidth (computing) , electronic engineering , control theory (sociology) , computer science , optoelectronics , engineering , electrical engineering , optics , telecommunications , control (management) , artificial intelligence , antenna (radio) , quantum mechanics
A compact four‐order fully‐canonical dual‐band bandpass filter (DBBPF) with independently controllable bandwidths is reported in this letter. The filter comprises of a pair of identical electrically end‐coupled dual‐mode open stub‐loaded resonators (OSLRs) and two different pairs of magnetically coupled λ /4 short‐circuit resonators (SCRs) that are embedded within the OSLRs for compactness. Specifically, the fundamental odd‐ and even‐mode of the OSLRs are coupled with the upper and lower pairs of λ /4 SCRs to generate the first and second passbands, respectively. In addition, the input and output ports feed the two OSLRs and provide a magnetic source‐load coupling for the filter. Owing to the special layout arrangement, the proposed filter can achieve compact size and fully‐canonical frequency response with independently controllable bandwidths, simultaneously. A four‐pole DBBPF protype centred at 2 and 3.5 GHz is designed and implemented. The measurements and the simulated ones are in good consistency.