High-resolution adaptive nulling performance for a lightweight agile EHF multiple beam antenna

The design, fabrication and measured performance of a lightweight high-resolution adaptive nulling EHF multiple beam antenna (MBA) are addressed. A 127-beam MBA and a four-channel RF nulling network operating over the 43.5 to 45.5 GHz band are used to adaptively null a jammer in anechoic chamber measurements. Lightweight feed horns connected to waveguide transmission lines controlled by ferrite switches are used to select beam positions from the 127-beam MBA. The MBA is designed to provide independent coverage for three communications system users while providing pattern discrimination or nulling of multiple jammers located within 0.1/spl deg/ of the user. Cancellation greater than 30 dB when operating in a wide-band mode is experimentally demonstrated.<>