RFI Reduction by Control of Antenna Sidelobes

This paper describes measurements and theoretical developments on the far sidelobe or backlobe region of three basic antenna types:the horn antenna, the parabolic reflector antenna and the Luneberg lens antenna. The application is for RFI reduction with emphasis on the use of radar absorber materials. A technique for design of nulls in the Fresnel Zone of an aperture antenna is described and numerical examples represented. This technique has potential RFI application.