University Events

Description: Topic: Spectral Projection Model for Electromagnetic Scattering and Radiation

Location: Lester W. Cory Conference Room, Science & Engineering Building (SENG), Room 213A

Zoom Conference Link: https://umassd.zoom.us/j/96090411149
Meeting ID: 960 9041 1149 Passcode: 020796

Abstract:
The Spectral Projection Model (SPM) and Direct Spectral Projection Model (DSPM) are spectral techniques for analyzing the scattering patterns from two-dimensional objects. By employing the addition theorem for Hankel and Bessel functions, SPM represents the incident and scattered electric fields in the electric field integral equation and magnetic field integral equation as projections of spectral signatures. The spectral signature of a vector which may be represented as a sum of multiple vectors is shown to be the convolution of the spectral signatures of the individual vectors. The convolution operation is performed using Hadamard products in the Fourier domain. This allows SPM to be applied to a variety of different surfaces which may be described as a sum of vectors. The far-field scattering pattern is also shown to be the Discrete Fourier Transform of the spectral signature of the currents induced on the surface. The DSPM, which evolved from SPM, identifies a set of virtual sources that are the eigenfunctions of the scattering process. The currents induced on the surface are calculated by decomposing the spectral signature of the incident sources in terms of the spectral signatures of these virtual sources. This approach applies to both far-field (scattering) and near-field (radiation) sources. Both the SPM and DSPM techniques were then applied to a variety of elliptical cylinders for waves incident from different incident angles and different polarizations. The techniques produced good agreement with well-established Method of Moments techniques. The primary motivation for developing these models was the projection process clearly identifies the physics of the scattering process by separating the spectral signature of the induced currents from the shape of the object. This allows these models to be used as a design tool for surface or target synthesis.

Advisor(s): Dr. Dayalan P. Kasilingam, Professor, Department of Electrical & Computer Engineering, UMASS Dartmouth

Committee Members: Dr. Karen L. Payton, Professor Emeritus, Department of Electrical & Computer Engineering, UMASS Dartmouth; Dr. Paul J. Gendron, Associate Professor, Department of Electrical & Computer Engineering, UMASS Dartmouth; Dr. Gaurav Khanna, Professor, Department of Physics and Director of Research Computing, University of Rhode Island; Dr. Sadasiva Rao, Naval Research Laboratory, Washington, DC

NOTE: All ECE Graduate Students are ENCOURAGED to attend.
All interested parties are invited to attend. Open to the public.

*For further information, please contact Dr. Dayalan P. Kasilingam at 508.999.8534 or via email at dkasilingam@umassd.edu.