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180-Degree Branch Line Coupler Composed of Two Types of Iris-Loaded Waveguides

Hidenori YUKAWA, Yu USHIJIMA, Naofumi YONEDA, Moriyasu MIYAZAKI

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Summary :

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. Based on optimal electrical lengths, a 180-degree output phase difference can be achieved without additional phase shifters. The two main lines with different electrical lengths are realized by capacitive and inductive iris-loaded waveguides. The size of the proposed coupler is nearly half that of the conventional 180-degree branch line coupler with additional phase shifters. Thus, the proposed coupler is of advantage with respect to the conventional one. We designed a proposed coupler in the K-band for satellite communication systems. The measurement results demonstrate a reflection of -20 dB, isolation of -20 dB, coupling response of -3.1+0.1 dB/-0.1 dB, and phase differences of 0+0.1 deg/-1.4 deg and -180+0.5 deg/-2.3 deg at a bandwidth of 8% in the K-band.

Publication
IEICE TRANSACTIONS on Electronics Vol.E104-C No.2 pp.85-92
Publication Date
2021/02/01
Publicized
2020/08/14
Online ISSN
1745-1353
DOI
10.1587/transele.2020ECP5006
Type of Manuscript
PAPER
Category
Microwaves, Millimeter-Waves

Authors

Hidenori YUKAWA
  Mitsubishi Electric Corp.
Yu USHIJIMA
  Mitsubishi Electric Corp.
Naofumi YONEDA
  Mitsubishi Electric Corp.
Moriyasu MIYAZAKI
  Mitsubishi Electric Corp.

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