Hallen type integral equation for cylindrical antennas with finite gap excitation

Hallen's integral equation for cylindrical antennas is modified to deal wit h finite gap excitation. Because it is based on more realistic modeling, th e solution is more accurate, and the convergence is guaranteed. The new equ ation is written with a new excitation function dependent on the gap width. The moment method analysis is presented where the piecewise sinusoidal sur face current functions are used in Galerkin's procedure. Total, external an d internal current distributions can be determined. Numerical results for c ylindrical antennas with aide variety of gap width and radius are shown, an d are compared with the numerical results by the Pocklington type integral equation and those by measurement.