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Scattering matrix solution for an ideal star-junction multiplexer based on ladder-type filters

Published online by Cambridge University Press:  27 April 2020

Patricia Silveira Open the ORCID record for Patricia Silveira [Opens in a new window] ,
Jordi Verdú  and
Pedro de Paco
Patricia Silveira*
Affiliation:
Telecommunication and Systems Engineering Department, Universitat Autònoma de Barcelona (UAB), Bellaterra, Spain
Jordi Verdú
Affiliation:
Telecommunication and Systems Engineering Department, Universitat Autònoma de Barcelona (UAB), Bellaterra, Spain
Pedro de Paco
Affiliation:
Telecommunication and Systems Engineering Department, Universitat Autònoma de Barcelona (UAB), Bellaterra, Spain
*
Author for correspondence: Patricia Silveira, E-mail: patricia.silveira@uab.cat
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Abstract

Multiplexer design is a challenging task due to the high number of variables involved, raising the difficulty as the numbers of filters increase. Numerical computing tools provide a suitable environment to evaluate topologies and technologies before starting the long journey to the device. A direct scattering matrix solution for a star-junction multiplexer, based on the circuit theory, is presented in this work. The resulting star-junction matrix is introduced in a matrix system with the scattering matrix of each filter to evaluate the overall multiplexer response. This approach allows the acquisition of main multiplexer parameters like transmission, reflection, and cross-isolation response in a compact way, achieving a good starting point for the further full-wave optimization procedure. Furthermore, an approach for the design of a star-junction multiplexer is tackled based on the reflection coefficient phase. A triplexer under this interpretation is presented and evaluated using lumped elements.

Keywords

Input phasemultiplexerscattering matrix, star-junction
Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , Volume 12 , Special Issue 10: EuMCE 2019 Special Issue (Part II) , December 2020 , pp. 954 - 959
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Copyright
Copyright © Cambridge University Press and the European Microwave Association 2020

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