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Octave-bandwidth high-directivity microstrip codirectional couplers

Morgan, Matthew and Weinreb, Sander (2003) Octave-bandwidth high-directivity microstrip codirectional couplers. In: 2003 IEEE MTT-S International Microwave Symposium Digest. Vol.2. IEEE , Piscataway, NJ, pp. 1227-1230. ISBN 0-7803-7695-1.

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It is a well-known problem with microstrip backward-wave couplers that directivity suffers due to the differing phase velocities of the even- and odd-mode waves. A fully-planar alternative is the forward-wave, or codirectional-coupler, but these structures have not yet been widely accepted, in part because they are complex and tedious to design. Here, we offer a simple quarter-arc geometry for loosely-coupled microstrip couplers with high-directivity that can be very quickly modeled and prototyped. A design example of a 50-110 GHz 12 dB coupler is shown. Measurements indicate that the coupler has better than 20 dB directivity over the full octave bandwidth.

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Weinreb, Sander0000-0002-9353-6204
Additional Information:© 2003 IEEE. The authors wish to express their thanks to the staff of American Technical Ceramics for fabrication of the Alumina substrates, and to the National Radio Astronomy Observatory for financial support. The work described in this paper was carried out in part by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.
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Record Number:CaltechAUTHORS:20180530-082209271
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Official Citation:M. Morgan and S. Weinreb, "Octave-bandwidth high-directivity microstrip codirectional couplers," IEEE MTT-S International Microwave Symposium Digest, 2003, Philadelphia, PA, USA, 2003, pp. 1227-1230 vol.2. doi: 10.1109/MWSYM.2003.1212590
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:86699
Deposited By: Tony Diaz
Deposited On:30 May 2018 16:40
Last Modified:15 Nov 2021 20:41

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