Radiation from wire antennas attached to bodies of revolution: The junction problem

A method of moments (MM) formulation for multiple wires attached to biodes of revolution (BOR) is presented. This formulation builds on previous MM analyses for BOR's and wires. A special junction basis function is introduced to represent the physical currents in the BOR-wire attachment (junction) region. In the formulation, currents are represented by 1) mode-dependent and piecewise-continuous expansion functions on the BOR, 2) piecewise-continuous functions on the wires, and 3) a continuity-preserving basis function for the junction region. The block diagonal character of the MM/BOR matrix formulation and the computational economy of the MM analysis for wires are retained. The analysis is demonstrated for surface-attached radiators such as monopoles and loops as well as surface-attached passive elements.