Input admittance of a biconical antenna with wide feed gap

The biconical antenna fed across a wide feed gap is studied as a boundary-value problem, using modal analysis. The study deals with finite-length antennas. It also includes the consideration of two limiting cases of biconical antennas, i.e. wide angle (spherical antennas) and very small angle (thin wire antennas). Expressions for the input as well as apparent terminal admittances are derived and corresponding values compared with available literature data for vanishingly small feed gap widths (delta function generator)