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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


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 22 dB and an insertion loss of 0.3 dB, with a bandwidth of 8% in the K-band.

Original languageEnglish
Pages (from-to)56-63
Number of pages8
JournalIEICE Transactions on Electronics
Issue number1
Publication statusPublished - 2019 Jan
Externally publishedYes


  • 3D-printer
  • Antenna feed
  • Ortho-mode-transducer
  • Waveguide

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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