Title :
UTD analysis of a shaped subreflector in a dual offset-reflector antenna system
Author :
Lim, Kyutae ; Ryu, Hwang ; Lee, Sangseol ; Choi, Jaehoon
Author_Institution :
Digital Commun. Lab., Samsung Adv. Inst. of Technol., Suwon, South Korea
fDate :
10/1/1998 12:00:00 AM
Abstract :
The geometrical theory of diffraction (GTD) is known as an efficient high-frequency method for the analysis of electrically large objects such as a reflector antenna. However it is difficult to obtain geometrical parameters in order to apply GTD to an arbitrary shaped reflector, especially a subreflector. The geometrical parameters of an arbitrary shaped subreflector for the uniform theory of diffraction (UTD) analysis are derived based on differential geometry. The radiation patterns of various subreflector types, including hyperboloidal and a shaped subreflector, are evaluated by UTD. The computed result for the hyperboloidal reflector agrees well with that obtained by uniform asymptotic theory (UAT)
Keywords :
antenna radiation patterns; differential geometry; geometrical theory of diffraction; offset reflector antennas; UTD analysis; arbitrary shaped reflector; arbitrary shaped subreflector; differential geometry; dual offset-reflector antenna system; efficient high-frequency method; electrically large objects; geometrical parameters; geometrical theory of diffraction; global interpolation; hyperboloidal subreflector; radiation patterns; shaped subreflector; uniform asymptotic theory; uniform theory of diffraction; Antenna radiation patterns; Antenna theory; Digital communication; Geometry; Laboratories; Pattern analysis; Physical optics; Physical theory of diffraction; Reflector antennas; Scattering parameters;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
