Open AccessHigh common‐mode suppression balanced bandpass filter using isosceles right‐angled triangular resonator
Author(s) -
Zhang Qiao,
Chen Chang,
Chen Weidong
Publication year - 2019
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/el.2019.1945
Subject(s) - band pass filter , isosceles triangle , passband , resonator , filter (signal processing) , physics , bandwidth (computing) , optics , mode (computer interface) , control theory (sociology) , acoustics , electronic engineering , topology (electrical circuits) , computer science , engineering , telecommunications , mathematics , electrical engineering , geometry , control (management) , artificial intelligence , operating system
A balanced bandpass filter with high common‐mode (CM) suppression using isosceles right‐angled triangular (RAT) resonator is proposed in this Letter. The two high order orthogonal modes (TM 210 Z and TM 200 Z ) are generated in the two overlapped isosceles RAT resonators under differential‐mode (DM) and CM excitation, respectively. In this structure, TM 210 Z mode will be transmitted and TM 200 Z mode will be blocked. Furthermore, four via‐holes are introduced to disturb TM 210 Z mode while TM 200 Z mode is unaffected, in order to shift the DM passband to the position of CM suppression. The designed balanced bandpass filter operating at 6.12 GHz with 3 dB fractional bandwidth of 5% is fabricated and measured. The measured and simulated results match very well with each other validating the feasibility of the proposed design concept.