Selectivity-Enhancement Technique for Stepped-Impedance-Resonator Dual-Passband Filters

A class of stepped-impedance resonator (SIR) dual-band bandpass filter (BPF) with selectivity-enhancement cells is reported. These dual-band filtering cells, which are composed of two open-ended transmission-line segments interconnected at the input, are added at one node of the input and output cou...

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Bibliographic Details
Published inIEEE microwave and wireless components letters Vol. 29; no. 7; pp. 453 - 455
Main Authors Gomez-Garcia, Roberto, Yang, Li, Munoz-Ferreras, Jose-Maria, Psychogiou, Dimitra
Format Journal Article
LanguageEnglish
Published IEEE 01.07.2019
Subjects
Band-pass filters
Bandpass filter (BPF)
Bandwidth
Dual band
dual-band filter
Frequency synthesizers
microstrip filter
Passband
planar filter
Resonant frequency
selectivity-enhancement cell
stepped-impedance resonator (SIR)
Transmission lines
transmission zero (TZ)
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Summary:A class of stepped-impedance resonator (SIR) dual-band bandpass filter (BPF) with selectivity-enhancement cells is reported. These dual-band filtering cells, which are composed of two open-ended transmission-line segments interconnected at the input, are added at one node of the input and output coupled-line stages. Thus, with regard to the SIR dual-band BPF without cells, they increase the order of each passband by two and simultaneously generate transmission zeros (TZs) at both sides of the two transmission bands. The operating principles of the proposed dual-band BPF are detailed at the coupling-routing-diagram level and design guidelines for its transmission-line configuration are provided. Moreover, for experimental-validation purposes, a 1.57-GHz/2.38-GHz dual-band BPF microstrip prototype with symmetrical absolute bandwidths is manufactured and characterized.
ISSN:1531-1309
1558-1764
DOI:10.1109/LMWC.2019.2916458