Analytical High-efficiency Spot beam Model for High Throughput Satellites

Abstract

We develop a simple model for a feed horn with a uniformly excited circular aperture at the focus of an offset paraboloidal reflector antenna and compare it with reflector antenna analyses using combinations of circular waveguide TE_1n modes. The model demonstrates the deep dip that can occur at the center of the spot beam for certain feed diameters and it is used in a design procedure that relates the feed and the spot-beam diameter. The model may be extended to include feed horn flare effects.

Keywords

• Satellite antenna
• multibeam antenna
• offset reflector
• circular waveguide feed
• high-efficiency feed
• high throughput satellite