| abstract |
1. A jammer for radars or the like operating in a given frequency band, comprising an antenna system having an elongated radiation aperture and means for producing a multiplicity of simultaneous directional radiation beams, said means including a multiplicity of feed lines each connected so as to produce one of said beams, a plurality of fixed-tuned radio receivers each connected to one of said feed lines and having a radio frequency bandwidth sufficient to encompass said given frequency band, a transmitter for producing jamming waves having components extending throughout said given frequency band, a switching means connecting said transmitter to each feed line and responsive to the receiver connected to the same feed line, for causing said antenna system to radiate jamming waves in every direction from which signals of a predetermined amplitude are received. |