A Broad-Band Spherical Satellite Antenna

The design criteria and results of the design of a broad-band spherical antenna are discussed. The parameters of design and their effect on radiation patterns are briefly investigated. The particular antenna was developed from an equiangular spiral slot plotted on a plane and then projected on the surface of a sphere. Attention is given to problems of isolation and matching when the antenna is used for multifrequency operation. The particular antenna discussed is being used in the TRANSIT satellite program.