Summary
International Symposium on Antennas and Propagation
2008
Session Number:3C30
Session:
Number:3C30-3
Novel Effective Electromagnetic Mathematic Models for the Performance Estimation of Rotationally Symmetric Parabolic Reflector Antennas
Shih-Chung Tuan, Hsi-Tseng Chou,
pp.-
Publication Date:2008/10/27
Online ISSN:2188-5079
Summary:
Because of reflector antennas have features of high directivities and low sidelobe levels, and are widely employed in applications of the point-to-point and satellite communications. To apply the antennas in an efficient fashion, their performance needs properly estimated. Relatively simple formulations that exhibit the information are desired. In this paper, effective formulations based on approximate electromagnetic (EM) mathematic models are developed to efficiently estimate the performances of rotationally symmetric parabolic reflector antennas including spillover and aperture efficiencies. The EM mathematic models employ cosine and sine functions with fractional powers to approximate the copolarized and cross-polarized components of the fields radiated from the antennas feeding to the reflectors, where closed form solutions of the antenna performances are then obtained. In distinguishing from previous works in [1-3], where only cosine tapers with integer powers are employed to model the copolarized components of the feed’s radiation with the cross-polarized components ignored, the present work is a broad extension of [1-3], and provides tremendous flexibility in the modeling of realistic feed antennas. Furthermore it allows one to estimate the impact on the antenna performance due to the crosspolarized components. It can be further integrated to provide optimization of the antenna design. Thus the presented solutions apparently have broader applications. Numerical examples are presented to demonstrate the analysis.