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Paper Abstract and Keywords
Presentation 2018-10-19 10:10
180-Degree Branch Line Coupler Composed of Two Types of Iris-Loaded Waveguides
Hidenori Yukawa, Yu Ushijima, Toru Takahashi, Naofumi Yoneda, Moriyasu Miyazaki (Mitsubishi Ele. Corp.)
Abstract (in Japanese) (See Japanese page) 
(in English) We propose a 180-degree branch line coupler composed of two types of iris-loaded waveguides. The proposed coupler consists of two main transmission lines and branch lines with different electrical lengths. Optimal electrical lengths enable to achieve 180-degree output phase difference without additional phase shifters. The two main lines with different electrical lengths are realized by capacitive and inductive iris-loaded waveguides. We designed a proposed coupler in K-band. The size of the proposed coupler is almost same as the usual 90-degree branch line coupler. So the proposed coupler presents an advantage of compactness, in comparison with the conventional 180-degree coupler with additional phase shifters. The measurement results demonstrated a return loss of 20dB, an isolation of 20dB, a coupling response of -3.1dB+0.1/-0.1dB, phase differences of 0deg+0.1/-1.4deg and -180deg+0.5/-2.3deg with a bandwidth of 8% in the K-band.
Keyword (in Japanese) (See Japanese page) 
(in English) Antenna feed systems / Waveguide / Coupler / Satellite communication / / / /  
Reference Info. IEICE Tech. Rep., vol. 118, no. 248, MW2018-84, pp. 89-94, Oct. 2018.
Paper # MW2018-84 
Date of Issue 2018-10-11 (EMCJ, MW, EST) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380

Conference Information
Conference Date 2018-10-18 - 2018-10-19 
Place (in Japanese) (See Japanese page) 
Place (in English) Hachinohe Chamber of Commerce and Industry(Hachinohe city, Aomori) 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Simulation techniques, EMC, Microwave, Electromagnetic field simulation, etc. 
Paper Information
Registration To MW 
Conference Code 2018-10-EST-MW-EMCJ-EMT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) 180-Degree Branch Line Coupler Composed of Two Types of Iris-Loaded Waveguides 
Sub Title (in English)  
Keyword(1) Antenna feed systems  
Keyword(2) Waveguide  
Keyword(3) Coupler  
Keyword(4) Satellite communication  
1st Author's Name Hidenori Yukawa  
1st Author's Affiliation Mitsubishi Electric Corporation (Mitsubishi Ele. Corp.)
2nd Author's Name Yu Ushijima  
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 Naofumi Yoneda  
4th Author's Affiliation Mitsubishi Electric Corporation (Mitsubishi Ele. Corp.)
5th Author's Name Moriyasu Miyazaki  
5th Author's Affiliation Mitsubishi Electric Corporation (Mitsubishi Ele. Corp.)
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Date Time 2018-10-19 10:10:00 
Presentation Time 25 
Registration for MW 
Paper # IEICE-EMCJ2018-48,IEICE-MW2018-84,IEICE-EST2018-70 
Volume (vol) IEICE-118 
Number (no) no.247(EMCJ), no.248(MW), no.249(EST) 
Page pp.89-94 
#Pages IEICE-6 
Date of Issue IEICE-EMCJ-2018-10-11,IEICE-MW-2018-10-11,IEICE-EST-2018-10-11 

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