Presentation 2018-10-19
180-Degree Branch Line Coupler Composed of Two Types of Iris-Loaded Waveguides
Hidenori Yukawa, Yu Ushijima, Toru Takahashi, Naofumi Yoneda, Moriyasu Miyazaki,
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Abstract(in Japanese) (See Japanese page)
Abstract(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)
Keyword(in English) Antenna feed systems / Waveguide / Coupler / Satellite communication
Paper # EMCJ2018-48,MW2018-84,EST2018-70
Date of Issue 2018-10-11 (EMCJ, MW, EST)

Conference Information
Committee EST / MW / EMCJ / IEE-EMC
Conference Date 2018/10/18(2days)
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.
Chair Akimasa Hirata(Nagoya Inst. of Tech.) / Masahiro Muraguchi(TUS) / Osami Wada(Kyoto Univ.) / 山崎 健一(電中研)
Vice Chair Shinichiro Ohnuki(Nihon Univ.) / Masayuki Kimishima(Advantest) / Jun Shibayama(Hosei Univ.) / Yoshinori Kogami(Utsunomiya Univ.) / Hiroshi Okazaki(NTT DOCOMO) / Kenichi Tajima(Mitsubishi Electric) / Kensei Oh(Nagoya Inst. of Tech.)
Secretary Shinichiro Ohnuki(CIST) / Masayuki Kimishima(National Inst. of Tech.,Sendai College) / Jun Shibayama(HITACHI) / Yoshinori Kogami(Utsunomiya Univ.) / Hiroshi Okazaki(Tokyo Inst. of Tech.) / Kenichi Tajima(Mitsubishi Electric) / Kensei Oh(東北学院大) / (鉄道総研)
Assistant Takahiro Ito(Nagoya Inst. of Tech.) / Kazuhiro Fujita(Fujitsu) / Mizuki Motoyoshi(Tohoku Univ.) / Satoshi Yoshida(Kagoshima Univ.) / Shinobu Nagasawa(Mitsubishi Electric) / Shinichiro Yamamoto(Univ. of Hyogo) / Takanori Unou(Denso) / 井渕 貴章(阪大)

Paper Information
Registration To Technical Committee on Electronics Simulation Technology / Technical Committee on Microwaves / Technical Committee on Electromagnetic Compatibility / Technical Meeting on Electromagnetic Compatibility (IEE-EMC)
Language JPN
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.)
Date 2018-10-19
Paper # EMCJ2018-48,MW2018-84,EST2018-70
Volume (vol) vol.118
Number (no) EMCJ-247,MW-248,EST-249
Page pp.pp.89-94(EMCJ), pp.89-94(MW), pp.89-94(EST),
#Pages 6
Date of Issue 2018-10-11 (EMCJ, MW, EST)