Design Optimization Procedures for Multi-Feed Satellite Shaped-Beam Antennas

This paper describes a systematic procedure for the design of offset parabolic satellite frequency reuse antennas with multiple feeds. Launch vehicle size constraints and the coverage requirements determine the optimum reflector geometry and feed parameters. Then, the amplitudes and phases of the multiple feeds are optimized simultaneously at the two ends of the frequency band to satisfy coverage gain and isolation requirements. Sensitivity analysis of the coverage patterns to feed excitation variations is included in the overall design process.