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Analysis of the electromagnetic scattering from an inlet geometry with lossy wallsOne of the primary goals is to develop an approximate but sufficiently accurate analysis for the problem of electromagnetic (EM) plane wave scattering by an open ended, perfectly-conducting, semi-infinite hollow circular waveguide (or duct) with a thin, uniform layer of lossy or absorbing material on its inner wall, and with a simple termination inside. The less difficult but useful problem of the EM scattering by a two-dimensional (2-D), semi-infinite parallel plate waveguide with an impedance boundary condition on the inner walls was chosen initially for analysis. The impedance boundary condition in this problem serves to model a thin layer of lossy dielectric/ferrite coating on the otherwise perfectly-conducting interior waveguide walls. An approximate but efficient and accurate ray solution was obtained recently. That solution is presently being extended to the case of a moderately thick dielectric/ferrite coating on the walls so as to be valid for situations where the impedance boundary condition may not remain sufficiently accurate.
Document ID
19850017375
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Myung, N. H. (Ohio State Univ. Columbus, OH, United States)
Pathak, P. H. (Ohio State Univ. Columbus, OH, United States)
Chunang, C. D. (Ohio State Univ. Columbus, OH, United States)
Date Acquired
September 5, 2013
Publication Date
April 1, 1985
Subject Category
Communications And Radar
Report/Patent Number
PR-715723
NASA-CR-175743
NAS 1.26:175743
Accession Number
85N25686
Funding Number(s)
CONTRACT_GRANT: NAG3-476
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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