Multi-mode excitation of large aperture horns to produce electronic deflection of directional pattern

A method for producing electronic deflection of directional pattern of apertures, large compared to the wavelength, by exciting a number of modes, particularly in a horn, is discussed. Such electronic deflection of directional pattern of apertures could be usefully employed, amongst others, as hardened antennas for application in ground systems of navigation satellites, satellite-controlled satellites, etc., where the scan angle is between 10 to 15 beam widths. It might also be used, depending on the number of modes that could be independently excited, for radars associated with the ballistic missile defence and for flush-mounted aircraft applications.