ON THE EQUIVALENT CIRCUIT, INPUT IMPEDANCE, REFLECTION COEFFICIENT, AND BANDWIDTH OF PRINTED MONOPOLE ANTENNA

摘要

This article presents the derivation of a closed form expression for input admittance of horizontal electric dipole over an ungrounded substrate using transmission line analogy. The derived expression is then used to calculate reflection coefficient of rectangular and circular printed monopole antenna (PMA) fed by a microstrip line. Analytical result for the reflection coefficient of both rectangular and circular PMA is verified using high frequency structure simulator (HFSS). For circular PMA, analytical, and simulated results are also compared with the measured results available in literature. Effect of the dimension and dielectric material on the antenna bandwidth is also studied and verified by HFSS. (c) 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1535-1538, 2015