Accession Number : ADP006382

Title :   Analytical Prediction of EM Scattering by Complex Obstacles Within Electrically Large Open Cavities,

Corporate Author : OHIO STATE UNIV COLUMBUS ELECTROSCIENCE LAB

Personal Author(s) : Pathak, P. H.

Report Date : SEP 1991

Pagination or Media Count : 6

Abstract : The object of this paper is to describe an analytical technique for predicting the electromagnetic(EM) scattering by complex obstacles within electrically large open waveguide cavities. This topic is of relevance to EM scattering and EMC type applications. Figure 1(a) illustrates a general open-ended cavity configuration of interest in the present work. The fully three dimensional open waveguide cavity in Figure 1(a) is assumed to be relatively arbitrarily shaped, and the open front end of the cavity is illuminated by an arbitrarily polarized external plane wave field. The interior obstacle is assumed to be located within the cavity near the back end, and it generally contributes significantly to the fields scattered into the exterior by the entire cavity configuration. The scattering from the external features of the cavity, excluding the scattering from just the rim at the open front end, is not of interest in the present analysis. Hence, the present scattering analysis is restricted to within approximately 70 degrees from boresight with respect to the open front end; outside of this region, the scattering by the external features of the cavity are generally more significant than from the interior of the cavity. It is also assumed in the present work that the incident wave always directly illuminates the open front end.

Descriptors :   *ELECTROMAGNETIC SCATTERING, BORESIGHTING, CAVITIES, CONFIGURATIONS, EXTERNAL, PLANE WAVES, SCATTERING, THREE DIMENSIONAL, WAVEGUIDES, ELECTROMAGNETIC WAVE PROPAGATION, BACKSCATTERING, TARGET DETECTION, MILITARY EQUIPMENT.

Subject Categories : Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE