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Aperture Field Estimation in Waveguide for Non-Sinusoidal Periodic Excitation

Author(s): Sushrut Das | Kalidas Marandi

Journal: Journal of Electromagnetic Analysis and Applications
ISSN 1942-0730

Volume: 04;
Issue: 03;
Start page: 129;
Date: 2012;
Original page

Keywords: Waveguides | Aperture Distribution | Non-Sinusoidal Periodic Excitation | Moment Method

In this paper an attempt has been made to find the aperture field distribution in a rectangular waveguide for non-sinusoidal, periodic excitations using Multiple Cavity Modeling Technique. The excitation functions, considered, are square, trapezoidal and clipped sine wave in nature. In the present analysis these time domain excitation functions have been represented in terms of a truncated Fourier series consisting of the fundamental frequency and its higher harmonics. Within the waveguide the fundamental frequency will give rise to a dominant mode excitation whereas the higher order modes will excite dominant as higher order modes. If the higher harmonics are assumed suppressed then the waveguide is subjected only to a dominant mode excitation. Results for dominant mode reflection coefficient (magnitude), VSWR and complex transmission coefficient have been computed and compared with theoretical data. The excellent agreement between them validates the analysis.
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