Open AccessAn alternating high‐low impedance common‐mode filter for differential striplines
Author(s) -
Song TianHao,
Wei XingChang,
Gao Richard XianKe
Publication year - 2021
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/mia2.12192
Subject(s) - stripline , stopband , filter (signal processing) , electrical impedance , differential (mechanical device) , electronic engineering , acoustics , band pass filter , engineering , mathematics , physics , optics , electrical engineering , aerospace engineering
The conventional quarter/half‐wavelength common‐mode filter (CMF) cannot work well for a differential stripline when there is no ground via. A new and effective via‐free CMF design for the differential striplines is proposed in this study. An alternating high‐low impedance structure is developed to increase the coupling between the stripline and the CMF, thus achieving a good filtering effect. A cascaded CMF design is further studied to enhance the stopband without deterioration of the differential signals. Both simulation and measurement results demonstrate the effectiveness of the proposed high‐low impedance CMF. The significant advantage of the proposed CMF is its compactness and simplicity, which has almost no impact on the original layout of differential striplines.