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amplitude analysis angle antenna array aperture approximately axial axis band bandwidth beamforming beamwidth boresight calculated characteristics circular circular polarization clean beams co-polar coefficients complex components configuration cross-polar cylinder diameter dielectric cone diffraction dipole direction effects efficiency EISCAT electromagnetic elements equation excitation experimental far-field feed feed horn frequency function gain geometry given ground plane helical antenna helix horn IEEE IEEE Trans impedance input integral length linear load lobe main reflector matrix measured method microstrip Microstrip Antenna microwave mode mutual coupling obtained offset reflector optimization parabolic reflector parameters parasitic helix performance phase error phased array polarisation polarization predicted probe problem propagation radar radiation fields radiation pattern ratio reflection reflector antenna region resonant satellite scan scattering shown in Figure sidelobe slot solution space structure subreflector substrate surface symmetry taper techniques theoretical theory tion values vector VSWR wave waveguide wavelength