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Paper Abstract and Keywords
Presentation 2021-05-20 13:55
Waveguide Rat-Race Coupler with Phase Inverter Circuits Comprised of Twists
Hidenori Yukawa, Takeshi Oshima, Toru Takahashi, Yoshio Inasawa (Mitsubishi Ele. Corp.) MW2021-7
Abstract (in Japanese) (See Japanese page) 
(in English) A rat race coupler is useful as a 180-degree coupler. But in principle, a phase difference of 180 degrees can be obtained only at the center frequency, and the transmission and coupling characteristics are different frequency characteristics. Therefore, it has a problem that the coupling amplitude difference and the coupling phase difference depend on the frequency and have each narrow band.
Here, we propose a rat race coupler that represents the low coupling amplitude difference and the low coupling phase difference. The proposed configuration consists of phase inversion circuit comprised of twists loaded on each line. In this circuit, unlike the conventional one, it is possible to realize a phase difference of 180 degrees without using the λ / 2 line length difference, and the phase slope with respect to the frequency of each line is the same. As a result, the transmission and coupling characteristics of the coupler become the same frequency characteristics, and the frequency characteristics of the phase difference also become frequency-independent. Therefore, the coupling amplitude difference and the coupling phase difference are reduced.
The measurement results demonstrated a return loss of 20dB, an isolation of 30dB, a coupling response of -3.1dB+0.15/-0.15dB, phase differences of 0deg+1/-1deg and -180deg+1/-1deg with a bandwidth of 8% in the K-band.
Keyword (in Japanese) (See Japanese page) 
(in English) Antenna feed systems / Waveguide / Rat-Race / Coupler / / / /  
Reference Info. IEICE Tech. Rep., vol. 121, no. 31, MW2021-7, pp. 11-16, May 2021.
Paper # MW2021-7 
Date of Issue 2021-05-13 (MW) 
ISSN Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF MW2021-7

Conference Information
Committee MW  
Conference Date 2021-05-20 - 2021-05-20 
Place (in Japanese) (See Japanese page) 
Place (in English) Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Microwave, etc. 
Paper Information
Registration To MW 
Conference Code 2021-05-MW 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Waveguide Rat-Race Coupler with Phase Inverter Circuits Comprised of Twists 
Sub Title (in English)  
Keyword(1) Antenna feed systems  
Keyword(2) Waveguide  
Keyword(3) Rat-Race  
Keyword(4) Coupler  
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Keyword(6)  
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1st Author's Name Hidenori Yukawa  
1st Author's Affiliation Mitsubishi Electric Corporation (Mitsubishi Ele. Corp.)
2nd Author's Name Takeshi Oshima  
2nd Author's Affiliation Mitsubishi Electric Corporation (Mitsubishi Ele. Corp.)
3rd Author's Name Toru Takahashi  
3rd Author's Affiliation Mitsubishi Electric Corporation (Mitsubishi Ele. Corp.)
4th Author's Name Yoshio Inasawa  
4th Author's Affiliation Mitsubishi Electric Corporation (Mitsubishi Ele. Corp.)
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Speaker Author-1 
Date Time 2021-05-20 13:55:00 
Presentation Time 25 minutes 
Registration for MW 
Paper # MW2021-7 
Volume (vol) vol.121 
Number (no) no.31 
Page pp.11-16 
#Pages 6 
Date of Issue 2021-05-13 (MW) 

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