Premium
Wideband balanced filters with sharp rejection based on coupled lines and stubs
Author(s) -
Feng Wenjie,
Yuan Miao,
Che Wenquan
Publication year - 2018
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.21461
Subject(s) - passband , wideband , electric power transmission , band pass filter , pole–zero plot , differential (mechanical device) , physics , common mode signal , transmission (telecommunications) , frequency selectivity , filter (signal processing) , topology (electrical circuits) , electronic engineering , telecommunications , computer science , optics , engineering , electrical engineering , transfer function , analog signal , thermodynamics
Two novel high selectivity wideband balanced filters based on coupled lines with multiple transmission zeros/poles are proposed in this article. Four and six transmission zeros out of the passband for the differential mode can be achieved and adjusted by the loaded coupled lines independently, resulting in over 15 dB/20 dB out‐of‐band rejection, respectively. In addition, the common mode can be suppressed >15 dB/20 dB over a wide frequency band with five and seven transmission zeros. Two prototypes with 3 dB fractional bandwidths of 56% and 42.7% for the differential mode are designed and fabricated. Good agreements can be observed between measured results and theoretical expectations.