Title :
Scattering from a circular disk: a comparative study of PTD and GTD techniques
Author :
Duan, Dah-Weih ; Rahmat-samii, Yahya ; Mahon, John Patrick
Author_Institution :
Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA
fDate :
10/1/1991 12:00:00 AM
Abstract :
Two groups of techniques, PTD (physical theory of diffraction) and GTD (geometric theory of diffraction), are studied by analyzing the scattering from a conducting circular disk. The authors include comparisons of calculations based on several different asymptotic high-frequency theories with the method of moments (MoM) as a baseline. The latter is treated as numerically exact. Features of particular interest include the performance at the reflection boundaries, boresight caustics, and far-angle sidelobes. The bistatic radar cross sections (RCSs) calculated by these techniques are examined. Although only far-field radiation is considered, these methods can also be used for near-field calculations
Keywords :
antenna theory; electromagnetic wave diffraction; electromagnetic wave scattering; geometrical optics; physical optics; radar cross-sections; reflector antennas; asymptotic high-frequency theories; bistatic radar cross sections; boresight caustics; conducting circular disk; far-angle sidelobes; far-field radiation; geometric theory of diffraction; geometrical optics; method of moments; near-field calculations; physical optics; physical theory of diffraction; reflection boundaries; reflector antennas; scattering; Message-oriented middleware; Moment methods; Optical diffraction; Optical reflection; Optical scattering; Physical optics; Physical theory of diffraction; Radar scattering; Reflector antennas; Switches;
Journal_Title :
Proceedings of the IEEE
