The current in a parasitic antenna in a dissipative medium

A relatively simple analytic formula is derived for the current in a bare conducting cylinder of length and radius when embedded in an isotropic homogeneous dissipative medium and excited by a periodic electric field with uniform amplitude and phase along its axis. In the derivation the same approximations are made as in an earlier analysis of the center-driven antenna for which complete experimental verification has been obtained. Computations are reported specifically for an antenna immersed in the ocean and excited by a field of very low frequency. The principal parameter is in the range from 0.03 to 0.23 at a frequency of 5 Hz, where is the wavelength in sea water. The effect of changes in the radius are also shown successively with and as the variable parameter. When the results of this paper are combined with those for the center-driven element, they provide the means for determining the response of a center-loaded dipole receiving antenna when immersed in a dissipative medium. Such an antenna is of interest in problems that relate to communication with submerged submarines and off-shore facilities.