Daniel S. Katz*, Allen Taflove
EECS Department
Robert R. McCormick School of Engineering
Northwestern University
Evanston, IL 60208
This paper continues previous research in finite-difference time-domain (FD-TD) analysis of radiating structures. The paper consists of two parts. The first part reports studies of two-dimensional, electrically-large (~50 wavelength) parabolic reflectors, illuminated by point sources and horn antennas. The resulting far-field patterns are compared with those generated by the geometric theory of diffraction (GTD.) The location of the feed antenna along the axis of the parabola is varied, and the results are examined.
The second part considers radiation by three-dimensional, open-ended waveguides and horn antennas. Where possible, FD-TD results are compared with results generated by the method of moments (MoM.)