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Proceedings Paper

Scattering from three-dimensional objects embedded in multilayered media
Author(s): Ibrahim M. Elshafiey; Lalita Udpa; Satish S. Udpa
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Paper Abstract

This paper presents a model for computing the scattered field of a three dimensional scatterer embedded in multilayered media. The embedded object is modeled using a volume integral equation approach which allows the handling of general inhomogeneous objects. THe multilayered media is modeled using a transmission line analogy. The scattered field is obtained by obtaining the equivalent current sources in the discretization elements of the object. The convolution-form of the volume integral formulation allows the use of the conjugate gradient FFT computation method which is essential for reducing the memory storage requirements. Formulations are presented for scattering from an object in free space, a scatterer on top of a perfectly conducting surface and a scatterer embedded in multilayered media. The Green's function of the integral equation has two parts: a free space primary part and a secondary part due to the layered media. The secondary Green's function is in the form of Sommerfeld's integration which commonly has a fast oscillating integrand. Different techniques are presented to overcome this difficulty. This includes using an asymptotic solution using the stationary phase method and real axis integration. Results are presented for scattering from a sphere as an example of the object.

Paper Details

Date Published: 14 September 1994
PDF: 12 pages
Proc. SPIE 2275, Advanced Microwave and Millimeter-Wave Detectors, (14 September 1994); doi: 10.1117/12.186720
Show Author Affiliations
Ibrahim M. Elshafiey, Iowa State Univ. (United States)
Lalita Udpa, Iowa State Univ. (United States)
Satish S. Udpa, Iowa State Univ. (United States)

Published in SPIE Proceedings Vol. 2275:
Advanced Microwave and Millimeter-Wave Detectors
Satish S. Udpa; Hsiu C. Han, Editor(s)

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