On the Current Distribution in, and the Impedance of, a Circular Loop Antenna

We investigate the current distribution in, and the impedance of, a single-turn circular wire loop antenna lying in a homogeneous and lossless medium, in the framework of a theory developed by Wu and King et al. Using a detailed analysis of the Wu-King factors, we explain: how the current distribution proposed by Wu for the delta-gap source can be computed accurately; and how the number of terms and the terminal-zone network needed to obtain a good estimate of the antenna impedance can be determined.