Title :
A comparison between different techniques based on GTD for calculating radiation patterns of reflector antennas
Author_Institution :
TIW Systems Inc., Sunnyvale, CA, USA
Abstract :
Two indirect techniques are discussed: the extended aperture integration method and the spherical near-field far-field transformation (SNFT). The aperture integration method has been used extensively in calculating the radiation pattern of reflector antennas. Its accuracy is normally acceptable in calculating the main beam and the first few sidelobes. To calculate the far out sidelobes or to improve the accuracy of the results for the main beam and the first few sidelobes, the edge diffracted fields should be included in the aperture field integration. In the SNFT, the near field of the reflector is calculated on a sphere around the reflector using GTD (geometrical theory of diffraction). Then the far field is calculated from the near field using spherical wave expansion.<>
Keywords :
antenna radiation patterns; electromagnetic wave diffraction; reflector antennas; GTD; edge diffracted fields; extended aperture integration method; far field; geometrical theory of diffraction; main beam; near field; radiation patterns; reflector antennas; sidelobes; spherical near-field far-field transformation; spherical wave expansion; Antenna radiation patterns; Aperture antennas; Dipole antennas; Feeds; Geometrical optics; Optical diffraction; Optical reflection; Physical theory of diffraction; Ray tracing; Reflector antennas;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1992. AP-S. 1992 Digest. Held in Conjuction with: URSI Radio Science Meeting and Nuclear EMP Meeting., IEEE
Conference_Location :
Chicago, IL, USA
Print_ISBN :
0-7803-0730-5
DOI :
10.1109/APS.1992.221564
