Modal Decomposition Matrix (MDM) Method for Directly Calculating the Far Field of an Open Rectangular Waveguide with an Infinite Flange

Report No. ARL-TR-6536
Authors: Gregory Mitchell and Dr. Wasyl Wasylkiwskyj
Date/Pages: July 2013; 32 pages
Abstract: The radiation from a rectangular waveguide with a perfectly conducting infinite flange is determined using the modal decomposition matrix (MDM) method. This method uses the tangential boundary condition at the aperture to directly compute the far-field radiation patterns. The fields in the waveguide are expanded in terms of waveguide modes consistent with the approach of Felsen and Marcuvitz. The radiated field is expanded as an inverse Fourier transform and represented at the aperture in terms of the discretization of the free-space transverse wave number. The results of the MDM approach are compared to numerical models using commercial software.
Distribution: Approved for public release
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Last Update / Reviewed: July 1, 2013