On the edge mode in the theory of thick cylindrical monopole antennas

The Fourier transform is employed to develop the theory of thick cylindrical monopole antennas. The tubular monopole with an open end is considered as well as the solid monopole with a flat end. The unknown current or field distribution is expanded in a Fourier series, and Galerkin´s method is employed to develop simultaneous equations for the Fourier coefficients. When the edge mode is included among the basis functions, it is found this greatly improves the convergence of the moment-method calculations. Numerical data are included, showing excellent agreement with experimental measurements of the monopole admittance.