Power Flowing through the Surface of a Large-Current Radiator

A previously developed theory permitted us to calculate the electric and magnetic field strength produced by a current with arbitrary time variation flowing in a large-current radiator for any distance from the surface of the radiator to infinity. This permits one to determine Poynting's vector on the surface of the radiator and, by integrating it over the surface, to calculate the power flowing through the surface of the radiator at any time. One obtains the power radiated to the far zone, the power contained in the various near-zone components, and the required driving voltage. The influence of the antenna dimensions on these quantities may be studied to help with the design of better antennas.