Mutual admittance between circular apertures on a large conducting sphere
Abstract
Explicit expressions for the self admittance and the mutual admittance Y(ij) between two arbitrarily polarized circular apertures are presented. The aperture field distribution is that of TE(11) circular waveguide mode. The analysis makes use of a spherical mode expansion and of the addition theorem for tesseral harmonics. Numerical results show Y(ij) as a function of angular separation theta. The Eplane coupling exhibits asymptotic (large theta) behavior consistent with the lowest 'hard' surface ray order results. The slope of the Hplane coupling for large values of theta does not correspond to the lowestorder 'soft' surface ray attenuation, but rather to that of the lowestorder 'hard' ray. This behavior is explained.
 Publication:

Radio Science
 Pub Date:
 February 1979
 DOI:
 10.1029/RS014i001p00035
 Bibcode:
 1979RaSc...14...35H
 Keywords:

 Antenna Arrays;
 Apertures;
 Circular Polarization;
 Electrical Impedance;
 Spherical Antennas;
 Waveguides;
 Electric Fields;
 Electromagnetic Surface Waves;
 H Waves;
 Phased Arrays;
 Tesseral Harmonics;
 Communications and Radar