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Multi-band planar diplexers with sub-sets of frequency-contiguous transmission bands

Published online by Cambridge University Press:  24 May 2021

Roberto Gómez-García Open the ORCID record for Roberto Gómez-García [Opens in a new window] ,
Li Yang ,
José-María Muñoz-Ferreras  and
Dimitra Psychogiou
Roberto Gómez-García*
Affiliation:
Department of Signal Theory and Communications, University of Alcalá, Alcalá de Henares 28871, Madrid, Spain
Li Yang
Affiliation:
Department of Signal Theory and Communications, University of Alcalá, Alcalá de Henares 28871, Madrid, Spain
José-María Muñoz-Ferreras
Affiliation:
Department of Signal Theory and Communications, University of Alcalá, Alcalá de Henares 28871, Madrid, Spain
Dimitra Psychogiou
Affiliation:
Department of Electrical and Electronic Engineering, University College Cork, and Tyndall National Institute, Cork, Ireland
*
Author for correspondence: Roberto Gómez-García, E-mail: roberto.gomez.garcia@ieee.org
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Abstract

A class of multi-band planar diplexer with sub-sets of frequency-contiguous transmission bands is reported. Such a radio frequency (RF) device is suitable for lightweight high-frequency receivers aimed at multi-band/multi-purpose mobile satellite communications systems. It consists of two channelizing filters, each of them being made up of the in-series cascade connection of replicas of a constituent multi-passband/multi-embedded-stopband filtering stage. This building filtering stage defines a multi-passband transfer function for each channel, in which each main transmission band is split into various sub-passbands by the multi-stopband part. In this manner, each split passband gives rise to several sub-passbands that are imbricated with their counterpart ones of the other channel. The theoretical RF operational principles of the proposed multi-band diplexer approach with sub-sets of imbricated passbands are detailed by means of a coupling–routing–diagram formalism. Besides, the generation of additional transmission zeros in each channelizing filter for higher-selectivity realizations by exploiting cross-coupling techniques into it is also detailed. Furthermore, for experimental demonstration purposes, a microstrip proof-of-concept prototype of second-order octo-band diplexer in the frequency range of 1.5–2.5 GHz that consists of two quad-band channelizing filters with pairs of imbricated passbands is developed and characterized.

Keywords

Bandpass filterchannelizermicrostrip diplexermobile satellite communicationsmulti-band diplexermulti-band filterplanar diplexertransmission zero
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. 325 - 335
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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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