期刊
IEEE ACCESS
卷 8, 期 -, 页码 13541-13548出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/ACCESS.2020.2965746
关键词
Bandpass filter; balanced filter; parallel coupled lines; transmission pole (TP); transmission zero (TZ)
资金
- FY2019 JSPS Postdoctoral Fellowship for Research in Japan (Standard) [P19350]
Two different types of three pairs of coupled lines (TPCL) structures with bandpass and all-stop filtering (ASF) characteristics, respectively, are proposed and analyzed through impedance matrix deduction and input admittance calculation. Combined with the stepped-impedance stubs, high-selectivity single-ended and balanced filters using TPCL structures have been presented. Five transmission poles (TPs) within the passband and six deep transmission zeros (TZs) from 0 to 2f(0) (f(0): passband center frequency) can be realized in both of single-ended and balanced filters. For demonstration, two sharp roll-off single-ended and balanced filter prototypes with good in-band characteristics (insertion losses and return losses) and high common-mode suppression are designed, whose measured 3-dB fractional bandwidths are of 35% and 34.4% (differential mode), respectively. Good agreement between the simulations and measurements validates the design concept.
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