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Reactively-loaded non-periodic slow-wave artificial transmission lines for stop band bandwidth enhancement: application to power splitters

Published online by Cambridge University Press:  25 March 2019

Jan Coromina Open the ORCID record for Jan Coromina [Opens in a new window] ,
Paris Vélez ,
Jordi Bonache ,
Francisco Aznar-Ballesta ,
Armando Fernández-Prieto  and
Ferran Martín
Jan Coromina*
Affiliation:
CIMITEC, Departament d'Enginyeria Electrònica, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
Paris Vélez
Affiliation:
CIMITEC, Departament d'Enginyeria Electrònica, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
Jordi Bonache
Affiliation:
CIMITEC, Departament d'Enginyeria Electrònica, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
Francisco Aznar-Ballesta
Affiliation:
Departamento de Teoría de la Señal y Comunicaciones, Universidad Politécnica de Madrid, 28031 Madrid, Spain
Armando Fernández-Prieto
Affiliation:
Grupo de Microondas, Facultad de Física, Universidad de Sevilla, Avda. Reina Mercedes s/n, 41012 Sevilla, Spain
Ferran Martín
Affiliation:
CIMITEC, Departament d'Enginyeria Electrònica, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
*
Author for correspondence: Jan Coromina, E-mail: Jan.Coromina@uab.cat
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Abstract

This paper presents slow-wave transmission lines based on non-periodic reactive loading. Specifically, the loading elements are stepped impedance shunt stubs (SISS). By sacrificing periodicity using SISS tuned to different frequencies, multiple transmission zeros above the pass band arise, and the rejection level and bandwidth of the stop band is improved as compared with those of periodic structures. Through a proper design, it is possible to achieve compact lines, simultaneously providing the required electrical length and characteristic impedance at the design frequency (dictated by specifications), and efficiently filtering the response at higher frequencies. These lines are applied to the design of a compact power splitter with filtering capability in this work. The length of the splitter, based on a 35.35 Ω impedance inverter, is reduced by a factor of roughly two. Moreover, harmonic suppression better than 20 dB up to the fourth harmonic is achieved.

Keywords

Slow-waveArtificial transmission linesPower splitters
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 11 , Special Issue 5-6: EuMW 2018 Special Issue (Part I) , June 2019 , pp. 475 - 481
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2019 

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