On the Physical Realizability of Broad-Band Equivalent Circuits for Wire Loop and Dipole Antennas

摘要

Results of a study of the feasibility of using Singularity Expansion Method (SEM) data to synthesize broad-band equivalent circuits for loop and wire structures are reported. The positive realness of admittances derived are studied, on the basis of both pole-pair groupings and eigenmode groups within the SEM formalism. Synthesized circuits are given for a center-driven and a quarter-driven straight wire antenna, and for a circular loop. Results are compared with those derived by means of numerical solution of the time-dependent integral equations for each structure. The sensitivities of the response to changes in the values of poles and to circuit element values are considered. (Author)