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

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...

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Bibliographic Details
Published in:International journal of microwave and wireless technologies 2020-12, Vol.12 (10), p.954-959
Main Authors: Silveira, Patricia, Verdú, Jordi, de Paco, Pedro
Format: Article
Language:English
Subjects:
Circuits
Design
Multiplexers
Multiplexing
Optimization
Optimization techniques
Reflectance
Research Paper
S matrix theory
Software
Topology
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Summary: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.
ISSN:1759-0787
1759-0795
DOI:10.1017/S1759078720000422