Metal 3D-Printed T-Junction Ortho-Mode-Transducer with an Offset Stepped Post

Hidenori YUKAWA  Yu USHIJIMA  Motomi ABE  Takeshi OSHIMA  Naofumi YONEDA  Moriyasu MIYAZAKI  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E102-C   No.1   pp.56-63
Publication Date: 2019/01/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E102.C.56
Type of Manuscript: PAPER
Category: Microwaves, Millimeter-Waves
Keyword: 
waveguide,  antenna feed,  ortho-mode-transducer,  3D-printer,  

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Summary: 
We propose a T-junction OMT consisting of an offset stepped post. The offset stepped post contributes to the matching of two rectangular ports at the short circuit, situated at the opposite side walls. The structure without conventional ridges is simple and makes it possible to achieve robust performance. We fabricated a proposed T-junction OMT in a single piece of an aluminum alloy, using a commercial metal 3D-printer. The simple and compact structure with robust performance is proposed to overcome the disadvantages of a 3D-printer, such as fabrication tolerance and surface roughness. The measured results demonstrated a return loss of 22dB and an insertion loss of 0.3dB, with a bandwidth of 8% in the K-band.