Four-port diplexer for high Tx/Rx isolation for integrated transceivers

A four-port diplexer consisting of two back-to-back three-port diplexers combined with a 180° phase shifter in one branch is presented. The technique achieves high Tx/Rx isolation with relatively low degree filters. Two experimental diplexers are demonstrated, one with equal Q resonators in all filt...

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Bibliographic Details
Published inIET microwaves, antennas & propagation Vol. 12; no. 6; pp. 1034 - 1040
Main Authors Konpang, Jessada, Sandhu, Muhammad, Somjit, Nutapong, Hunter, Ian C
Format Journal Article
LanguageEnglish
Published The Institution of Engineering and Technology 23.05.2018
Subjects
back‐to‐back three‐port diplexers
four‐port diplexer
integrated transceivers
multiplexing equipment
phase shifter
phase shifters
Research Article
resonators
transceivers
back-to-back three-port diplexers
integrated transceivers
transceivers
four-port diplexer
multiplexing equipment
phase shifters
resonators
phase shifter
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Summary:A four-port diplexer consisting of two back-to-back three-port diplexers combined with a 180° phase shifter in one branch is presented. The technique achieves high Tx/Rx isolation with relatively low degree filters. Two experimental diplexers are demonstrated, one with equal Q resonators in all filters and the other with dissimilar Q factors, enabling miniaturisation and cost reduction. Measured results of Tx/Rx diplexer devices at 2.13/1.73 GHz are presented and 40 dB Tx/Rx isolation is achieved with only second-order filters.
ISSN:1751-8725
1751-8733
1751-8733
DOI:10.1049/iet-map.2017.0878