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IEEE Transactions on Antennas and Propagation
Volume 46 Number 11, November 1998

Table of Contents for this issue

Complete paper in PDF format

Input Admittance of a Multilayer Insulated Monopole Antenna

Zhongxiang Shen, Student Member, IEEE, and Robert H. MacPhie, Fellow, IEEE

Page 1679.

Abstract:

An efficient numerical technique based on the modal-expansion method in conjunction with a recursive algorithm is developed for a multilayer insulated monopole antenna fed by a coaxial transmission line. The modal-expansion analysis is facilitated by introducing a perfectly matched boundary (PMB) at a variable height over the ground plane of the monopole. The current distribution and input admittance are computed by finding the expansion coefficients of the electromagnetic field expressions. Numerical results for the input admittance of a dielectric-coated monopole antenna and an air-insulated monopole are compared with experimental ones available in the literature. Good agreement is achieved. Calculated results for the effects of various parameters on the input admittance of an air-insulated monopole antenna are presented and discussed.

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