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Synthesis and design of filters and multiplexers with acoustic transversal topology

Published online by Cambridge University Press:  01 July 2021

Rafael Perea-Robles Open the ORCID record for Rafael Perea-Robles [Opens in a new window] ,
Jordi Mateu ,
Carlos Collado ,
Yazid Yusuf ,
Alfred Gimenez  and
Robert Aigner
Rafael Perea-Robles*
Affiliation:
Universitat Politècnica de Catalunya (UPC), Barcelona08034, Spain
Jordi Mateu
Affiliation:
Universitat Politècnica de Catalunya (UPC), Barcelona08034, Spain
Carlos Collado
Affiliation:
Universitat Politècnica de Catalunya (UPC), Barcelona08034, Spain
Yazid Yusuf
Affiliation:
Qorvo Inc., Apopka, Florida32703, USA
Alfred Gimenez
Affiliation:
Qorvo Inc., Apopka, Florida32703, USA
Robert Aigner
Affiliation:
Qorvo Inc., Apopka, Florida32703, USA
*
Author for correspondence: Rafael Perea-Robles, E-mail: rafael.perea.robles@upc.edu
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Abstract

The novel acoustic transversal topology has demonstrated to be a potential candidate for the development of the next generation of communication filters. The major asset of this topology is its capacity to achieve any filter response without the detriment of limited electro-acoustic coupling. Additionally, this topology prompts for an easy connection of different filters to create multiband and multiplexing responses. This study recalls and further details on the design of multiplexers based on transversal topology using bulk acoustic wave (BAW) or surface acoustic wave (SAW) resonators. An important practical aspect of this topology is the need of a BALUN stage at one port of the filter.

The use of the transversal topology is then applied to another type of acoustic resonator configuration, coupled resonator filter (CRF). Such a resonator configuration offers control over the phase of each transversal path, allowing us to eliminate the BALUN stage. CRF resonators are modeled by means of a different circuit model than BAW or SAW, which calls for a new synthesis procedure. This paper describes the synthesis approach and circuit transformation for the development of multiplexers based on the transversal arrangement of the CRF resonators. An example of a fully simulated 9-plexer is provided to verify this procedure.

Keywords

Electro-acoustic filterstransversal filterstransversal multiplexerscoupled-resonators filtersCRFBAWSAW
Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , Volume 14 , Special Issue 3: Filters and Multiplexers for Satellite Communications Systems , April 2022 , pp. 305 - 312
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Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press in association with the European Microwave Association

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