Balanced quasi-elliptic-type dual-passband filters using planar transversal coupled-line sections and their digital modeling
IdentifiersPermanent link (URI): http://hdl.handle.net/10017/55350
Cambridge University Press
Agencia Estatal de Investigación
Yang, L., Malki, M., Muñoz Ferreras, J.M. & Gómez García, R. 2022, "Balanced quasi-elliptic-type dual-passband filters using planar transversal coupled-line sections and their digital modeling", International Journal of Microwave and Wireless Technologies, DOI: 10.1017/s175907872200071X.
Bandpass filter (BPF)
Parallel coupled line
Transmission zero (TZ)
info:eu-repo/grantAgreement/EC/H2020/754382/EU/GOT Energy Talent/GET
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2020-116983RB-I00/ES/NEW-GENERATION MICROWAVE PASSIVE COMPONENTS FOR ADVANCED WIRELESS-COMMUNICATIONS%2FRF-SENSING PLATFORMS/
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
© 2022 The authors
A class of balanced dual-band bandpass filters (BPFs) with planar transversal-signal-interference coupled-line sections is reported. In their building balanced dual-band BPF stage under differential-mode excitation, a second-order quasi-elliptic-type dual-band bandpass filtering transfer function is obtained. Specifically, from the transversal interaction among their two open-ended and virtually-short-ended half-wavelength coupled-line paths, sharp-rejection differential-mode dual passbands with several out-of-band transmission zeros at both sides are realized. To attain high common-mode suppression levels within the differential-mode passbands, two open-ended line segments are connected at the symmetry plane of the devised balanced dual-band BPF stage. Moreover, higher-order schemes based on in-series-cascaded multi-stage designs to further increase differential-mode selectivity and in-band common-mode rejection are illustrated. The operational principles and parametric-analysis design rules of the engineered transversal-coupled-line-based balanced dual-band BPF approach are detailed. Additionally, for a rigorous interpretation of their zero/pole characteristics, a digital-modeling framework is applied to them to connect RF balanced filters with their discrete-time versions. For practical-validation purposes, a microstrip prototype of two-stage/fourth-order balanced dual-band BPF is built and tested. It exhibits measured differential-mode dual passbands with center frequencies of 1.464 GHz and 2.294 GHz, 3-dB fractional bandwidths of 8.74% and 9.68%, and in-band common-mode rejection levels above 23.16 dB and 31.36 dB, respectively.
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