A Coupling Coefficient of a Rectangular Waveguide Connected on a Overmoded Circular Waveguide

Ryota HIROSE  Hiroyuki ARAI  Naohisa GOTO  

IEICE TRANSACTIONS (1976-1990)   Vol.E72   No.11   pp.1219-1223
Publication Date: 1989/11/25
Online ISSN: 
Print ISSN: 0000-0000
Type of Manuscript: PAPER
Category: Electromagnetic Theory

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The coupling coefficient of the directional coupler using small coupling holes for the gyrotron of 100 GHz band is very small to monitor fields. To obtain large coupling coefficient, this paper presents the structure of the rectangular waveguide connected to the overmoded circular waveguide. We analyse it as a boundary value problem, and also present an approximate method. In conclusion of this analysis, we get enough large coupling coefficient and enough small reflective coefficient from this structure.