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Adaptive Array amplitude analysis anechoic chamber angle antenna system AP-S Session aperture approximation axial ratio axis azimuth band bandwidth beam beamwidth boresight broadband calculated Cassegrain antenna circular coefficients components configuration constant corrugated cross-polarization curve cylinder depolarization desired signal determined diameter dielectric diffraction dipole distribution E-plane effects electric field electromagnetic Electronics experimental feed ferrite frequency function gain geometry helix horn horn antenna IEEE IEEE Trans impedance input integral equation ionosphere June 21 Laboratory lens linear magnetic matrix measured method microstrip Microwave mode near-field numerical obtained offset orthogonal output parameters performance phase error phase shifter phased array planar polarization probe problem propagation radar radiation pattern random range reference reflector antenna region resonance satellite scan scattering shown in Figure sidelobe solution space spherical surface symmetric technique theoretical theory tion transmitting Unimoment vector waveguide wavelength wire