Radiation Pattern Calculations for a Waveguide Lens Multiple-Beam Antenna Operating in the AJ Mode.

摘要

The jammer suppression obtained with a multiple-beam antenna (MBA) by radiation pattern shaping is studied for applications with the DSCS 3 satellites. Results are presented for three separate MBA designs each consisting of an X-band waveguide lens excited by a multi-element feed cluster located in its focal plane. To demonstrate the AJ performance of each MBA, calculations were carried out for a large number of jammer locations distributed over the surface of the earth. At each location, the jammer suppression is achieved by adjusting the amplitude excitation of the feed elements to create an earth-coverage radiation pattern with a minimum located in the direction of the jammer. Results which characterize the AJ performance of each MBA in terms of the null level at the jammer, null coverage area and frequency dependence are presented. (Author)