Compact substrate-integrated waveguide bandpass rat-race coupler and its microwave applications
A reduced size rat-race coupler, incorporating a bandpass frequency response characteristic, is presented and designed based on substrate-integrated waveguide (SIW) technology. By use of electric- and magnetic-coupling structures between adjacent SIW cavity resonators, a conventional rat-race couple...
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Published in | IET microwaves, antennas & propagation Vol. 6; no. 9; pp. 1000 - 1006 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Stevenage
Institution of Engineering and Technology
19.06.2012
The Institution of Engineering & Technology |
Subjects | |
Online Access | Get full text |
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Summary: | A reduced size rat-race coupler, incorporating a bandpass frequency response characteristic, is presented and designed based on substrate-integrated waveguide (SIW) technology. By use of electric- and magnetic-coupling structures between adjacent SIW cavity resonators, a conventional rat-race coupler and a bandpass filter with a 200-MHz bandwidth at a centre frequency of 7.75 GHz can be integrated as one component resulting in miniaturisation. A design process based on the coupled-resonator network is introduced to synthesise such a bandpass coupler with desired bandwidth, return loss and coupling. A Butler matrix and a six-port junction with bandpass response are then developed based on the proposed rat-race coupler. They represent excellent candidates for miniaturised transceiver and direct conversion systems. The measured results are in good agreement with the simulated predictions. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 1751-8725 1751-8733 |
DOI: | 10.1049/iet-map.2012.0011 |