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Balanced quasi-elliptic-type dual-passband filters using planar transversal coupled-line sections and their digital modeling

Published online by Cambridge University Press:  24 June 2022

Li Yang Open the ORCID record for Li Yang [Opens in a new window] ,
Mohamed Malki ,
José-María Muñoz-Ferreras  and
Roberto Gómez-García
Li Yang
Affiliation:
Department of Signal Theory and Communications, University of Alcalá, Alcalá de Henares 28871, Madrid, Spain
Mohamed Malki
Affiliation:
Department of Signal Theory and Communications, University of Alcalá, Alcalá de Henares 28871, Madrid, Spain
José-María Muñoz-Ferreras
Affiliation:
Department of Signal Theory and Communications, University of Alcalá, Alcalá de Henares 28871, Madrid, Spain
Roberto Gómez-García*
Affiliation:
Department of Signal Theory and Communications, University of Alcalá, Alcalá de Henares 28871, Madrid, Spain
*
Author for correspondence: Roberto Gómez-García, E-mail: roberto.gomez.garcia@ieee.org
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Abstract

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.

Keywords

Balanced filterbandpass filter (BPF)dual-band filtermicrostrip filterparallel coupled lineplanar filtersignal-interference filtertransmission zero (TZ)transversal section
Type
Filters
Information
International Journal of Microwave and Wireless Technologies , Volume 15 , Issue 3 , April 2023 , pp. 365 - 374
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Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press in association with the European Microwave Association

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