Fieldcontour plots in parabolic cylinder by method of moments
Abstract
The field strength inside an antenna reflector surface considered as an infinitely long parabolic cylinder is evaluated as a function of focallength/aperture ratio, using the method of moments which inverts an appropriate impedanceperunitlength matrix to find the current distribution produced on the reflector surface by an incident plane wave. Once the current distribution is known, it is straightforward to determine the scattered electric field, and hence, by phasor addition of the incident field, the total field within the parabolic cylinder. Results are presented in the form of contours of electric field within the cylinder and current distributions on the reflector. It is shown that the approximate geometrical and physicaloptics approaches to the parabolic cylinder can be supplemented by a more powerful approach based on the method of moments to greatly increase the quantitative information available.
 Publication:

Electronics Letters
 Pub Date:
 March 1977
 DOI:
 10.1049/el:19770151
 Bibcode:
 1977ElL....13..207B
 Keywords:

 Antenna Radiation Patterns;
 Current Distribution;
 Cylindrical Antennas;
 Electric Fields;
 Parabolic Antennas;
 Plane Waves;
 Current Density;
 Electric Field Strength;
 Matrices (Mathematics);
 Reflectors;
 Communications and Radar