Plane wave scattering from circular and hollow circular slit cylinders using the On Surface Radiation Condition (OSRC) approach
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Authors
Ali, Syed Mahmood
Subjects
Surface radiation conditions
transverse electric
circular cylinders
hollow cylinder slit cylinders
transverse electric
circular cylinders
hollow cylinder slit cylinders
Advisors
Janaswamy, R.
Date of Issue
1990-12
Date
1990-12
Publisher
Monterey, California: Naval Postgraduate School
Language
Abstract
A new formulation of electromagnetic wave scattering by convex, two dimensional conducting bodies was introduced. This formulation, called the On Surface Radiation Condition (OSRC) approach is based upon an expansion of the radiation condition applied directly on the surface of the scatterer. Past approaches involved applying a radiation condition at some distance from the scatterer in order to achieve a nearly reflection free truncation of a finite difference time domain lattice. Application of a suitable radiation condition directly on the surface of the convex conducting scatterer can lead to substantial simplification of the frequency domain integral equation for the scattered field, which is reduced to just a line integral. In this thesis, the application of the second order radiation boundary condition to concave and re- entrant two dimensional bodies is considered. The specific shapes considered are slit circular cylinders and thick semi-circular cylinders. The formulation is done for the more challenging case of Transverse Electric (TE) polarization. The bodies considered here are two dimensional in nature and are perfectly conducting. Results are presented for the surface current distribution and scattering width of these cylinders and comparison is made with known results. It was found that the OSRC approach may not be applicable to concave structures and also for higher values of kb for convex bodies.
Type
Thesis
Description
Series/Report No
Department
Electrical and Computer Engineering
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
vii, 71 p. ill.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
Copyright is reserved by the copryright owner.