Wideband hybrid diplexer using ridged waveguides

Osami Ishida*, Moriyasu Miyazaki, Yoji Isota

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


To develop a broadband diplexer to be used for the Ku band satellite communication earth station, a hybrid diplexer is proposed based on the branch waveguide directional coupler in which the main and auxiliary waveguides are ridged waveguides. The theoretical discussions and experimental results are described. First, the characteristics of the hybrid diplexer and those of the constituent components are expressed in terms of the scattering matrix so that the effect of the hybrid coupler is presented. Next, the characteristics of the branch waveguide directional coupler used as a hybrid coupler are studied theoretically. It is pointed out a broadband operation is possible by the use of ridged waveguides for the main and auxiliary waveguides. Further, using the transmit and receive diplexer for the Ku band satellite communication earth station as an example, the design and fabrication have been carried out to demonstrate the validity of the theoretical results.

Original languageEnglish
Pages (from-to)101-115
Number of pages15
JournalElectronics and Communications in Japan (Part I: Communications)
Issue number7
Publication statusPublished - 1992
Externally publishedYes


  • Satellite communication
  • antenna feeds
  • diplexer
  • earth station
  • microwave components
  • ridged waveguides

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering


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