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Analysis of Antennas in a Layered Medium
|關鍵字:||Method of Moments;矩量法;Green's Function;stationary phase approximation;格林函數;穩態相位法||出版社:||電機工程學系||摘要:||
The goal of this thesis is to investigate the radiation properties of antennas embedded in a layered medium. This thesis consists of two chapters. In the first chapter, we analyze the radiation properties of a dipole array mounted on a metal post. First, using a finite difference scheme to obtain the Green's function based on which an integral equation is formed. Method of moments is then applied to solve the integral equation for the current distributions on the dipoles. The radiation field is then derived by using analytic approach and stationary phase approximation. The effects of metal post radius, dipole positions, distance between dipoles and metal post, and dipole number are studied. Simulation results show that such an array can be used as an adaptive array.
In second chapter, we calculate the radiation characteristics of patch antennas with finite ground plane embedded in a layered medium. We first derive the field expression in the layered medium where reflection coefficients are defined to facilitate the derivations. Two approached are used to derive the integral equations, method of moments is then applied to solve for current distributions.
|Appears in Collections:||電機工程學系所|
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