A contribution to the theory of cylindrical antennas--Radiation between parallel plates

A solution of the wave equation is obtained corresponding to an outgoing cylindrical wave between two parallel ground planes, and satisfying the boundary conditions appropriate to a center-fed, full height antenna at the origin. Expressions for the antenna current and impedance are obtained from a small radius approximation to these; formulas are obtained for comparison with those from usual antenna theory. Attention is directed to the expansion parameter and gap capacitance.