Numerical Analysis on Characteristics of Resonance Windows in Rectangular Waveguides by the Variational Method

Masao KODAMA  Hideki UECHI  

IEICE TRANSACTIONS (1976-1990)   Vol.E70   No.5   pp.484-493
Publication Date: 1987/05/25
Online ISSN: 
Print ISSN: 0000-0000
Type of Manuscript: PAPER
Category: Microwaves

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Windows in rectangular waveguides are used frequently in microwave circuits. Capacitive or inductive windows have been studied in detail. Though the problems for the fields of these windows can be reduced to one-dimensional problems, the field of the resonance window is obtained by solving a two-dimensional problem. Thus the field of the resonance window is more difficult to obtain. Various characteristics of the resonance window in the rectangular waveguide have not been much studied analytically. A simple and approximate expression which was obtained experimentally for calculating the resonance frequency of the window is well known. The authors study the various characteristics of the resonance window by the variational method and Schwinger's transformation. We show an expression for susceptance of the window by these methods, and we can evaluate the resonance frequency and loaded Q numerically. These data by the numerical calculation are shown in figures, which may be useful to the design of microwave circuits. These data are compared to experimental data and theoretical values for windows of special cases. As a result, it is found that the data illustrated with the figures hold sufficient accuracy.