Improved closed form solution for center fed straight wire antennas

Abstract

The equivalent TEM mode theory, introduced by Fahmy and Eshrah in 2002[1], [2], [3], modeled the antenna as the inner conductor of a fictitious lossy transmission line with complex propagation constant and the proposed values of these constants are listed in tables without closed form expressions. The model parameters extraction procedure was rather complicated with some discrepancy in the input impedance values with respect to the results of the well established moment method solution. This paper uses the same model but the model parameters are extracted with a simple and systematic approach. The propagation constants are represented in closed form empirical expressions including only few terms yielding input impedance values in complete agreement with the well established moment method.