Simple Excitation Model for Coaxial Driven Monopole Antennas

A new excitation model for the numerical solution of the electric field integral equation (EFIE) applied to arbitrarily shaped monopole antennas fed by coaxial lines is presented. This model yields a stable solution for the input impedance of such antennas with very low numerical complexity and without the convergence and high parasitic capacitance problems associated with the usual delta gap excitation.