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IEEE Transactions on Antennas and Propagation
Volume 46 Number 10, October 1998

Table of Contents for this issue

Complete paper in PDF format

UTD Analysis of a Shaped Subreflector in a Dual Offset-Reflector Antenna System

Kyutae Lim, Hwang Ryu, Sangseol Lee, and Jaehoon Choi

Page 1555.

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. In this paper, 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).

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