Summary
International Symposium on Antennas and Propagation
2010
Session Number:3TE2
Session:
Number:3TE2-2
Analysis of Complex Antennas Using Iterative Vector Fields with UTD Method
Zhi-Li He, Kai Huang, Xun-Wang Zhao, Chang-Hong Liang, Hang Su,
pp.-
Publication Date:2010/11/23
Online ISSN:2188-5079
Summary:
Many accurate methods, such as finite element method (FEM), higher order MOM, and finite difference time domain (FDTD), have been utilized to analyze the electrically small complex antenna [1-4]. For higher order MOM method, it has been recognized that the use of higher order basis functions substantially reduces the number of unknowns hence reduce the size of the problem and the total solution time [1]. The efficiency is enhanced, however, it needs unbearable hardware requirements in solving electronically large problems. Based on ray solutions, UTD is an efficient high-frequency method. It is widely used to analyze Electro Magnetic Compatibility (EMC) problems with electrically large platforms [2-4]. It is well-known that hybridization of a kind of accurate method with UTD [2-4] has great potential to increase the capabilities of the individual method. For example, combining UTD with MOM has been effectively used to calculate the pattern of the antenna in complex environment [3], hybrid FDTD/UTD has been successfully applied to analyze phased array antennas mounted on airborne platform [4]. In this paper, iterative vector fields with UTD method is utilized to analyze the radiation pattern of complex antenna around electrically large platform. We consider full coupling between antenna and platform through Huygens’ surface currents instead of the process of modifying the impedance matrix of MOM with UTD in conventional MOM-UTD [2]. However, this coupling effect has been neglected in [3] and [4], in which the antenna was supposed to be far away from the platform. Based on this technique, an approximation method is also outlined. The relative patterns obtained from the present method and from the approximate method show good agreements with that obtained from MOM.