Integrated defense communications system antijamming antenna system

Claim 1

In combination with a signal processing system and an adaptive processor, an antijamming antenna system receiving and transmitting a desired communication signal and mainbeam and sidelobe jamming signals, said antijamming antenna system outputting a sum, azimuth difference, elevation difference signals, said antijamming antenna system outputting near-sidelobe and far-sidelobe signals, said antijamming antenna system comprising: a curved parabolic reflector having a focus and, receiving said jamming signals and a desired communication signal; first, second, third and fourth waveguides which are located in the focus of said curved parabolic reflector, said first, second, and third and fourth waveguides receiving and conducting all signals into said antijamming antenna system and having interior dimensions designed to conduct signals having the frequency of said desired communication signal, said first waveguide being a single mode horn; said second waveguide being a multimode horn fixed between said first and third waveguides; said third waveguide being a multimode horn; said fourth waveguide being a single mode horn attached to said third waveguide; a comparator means being electronically attached and receiving signals from said first, second, third and fourth waveguides, said comparator means outputting said sum, azimuth, difference and elevation difference signals; a first and second auxiliary antenna means each having a null in the direction of said desired communication signal and each being fixed in proximity to said curved parabolic reflector, said first auxiliary antenna means being an array of crossed-slot radiators which is fixed in proximity to said curved parabolic reflector, said array having an aperture size in range of 3 to 10 wavelengths of said desired communication signal, said array having a null in the direction of said desired communication signal, a first electrical connection attached to and receiving from said array only said near-sidelobe signal, and conducting said near-sidelobe signal as an output of said antijamming antenna system; said second auxiliary antenna means outputting said far-sidelobe jamming signal; and a transmit means being located in the focus of said curved parabolic reflector, said transmit means transmitting an output signal, said output signal being cross polarized to said desired communication signal.