An Analysis of Multi-Hole Directional Coupler

Hiroshi NISHIWAKI  Hiroyuki ARAI  Naohisa GOTO  

IEICE TRANSACTIONS (1976-1990)   Vol.E72   No.9   pp.979-983
Publication Date: 1989/09/25
Online ISSN: 
Print ISSN: 0000-0000
Type of Manuscript: PAPER
Category: Electromagnetic Theory

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This paper presents an analysis of a multi-hole directional coupler attached to an overmoded circular waveguide. The directional coupler is analized as a boundary value problem, and is solved numerically by a virtual cavity method. The approximate analysis of a small hole coupling coefficient is verified by this analysis. Numerical results indicate that the mutual coupling between holes is not negligible for calculating the directivity of the directional coupler.