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Grun, Leon 2014-12-12T20:55:17Z 2014-12-12T20:55:17Z 10000-01-01 1980 1980 Scattering of an incident plane, or cylindrical, wave by a staggered parallel-plate waveguide is examined. Of particular interest are the modal coefficients of the unattenuated modes in the waveguide when the incident field is an E-wave. Several past approaches based on ray techniques are critically examined. It is found that they are not applicable when the stagger is small or when the incident field is a cylindrical wave. For the latter incidence, we introduce here an aperture field method, in which the modal coefficients are calculated through the Fourier decomposition of the scattered field at the waveguide aperture. To determine this scattered field, we apply the uniform asymptotic theory for the primary contribution, and the spectral theory for the first interaction. Extensive numerical data show that the aperture field method gives accurate results in canonical problems whose exact solutions are known. As an application to the design of constraint waveguide lens antenna our method enables one to determine the field distributed over the lens in a more exact manner. Made available in DSpace on 2014-12-12T20:55:17Z (GMT). No. of bitstreams: 1 8108526.pdf: 3436408 bytes, checksum: 981b40f6747178ac06705b8f301146dd (MD5) Previous issue date: 1980 Embargo set by: Seth Robbins for item 66418 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 130 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1980. http://hdl.handle.net/2142/66239 (UMI)AAI8108526 eng Engineering, Electronics and Electrical Diffraction by Parallel-Plates With Application to Lens Antennas text Electrical Engineering Electrical Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.