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algorithm amplitude analysis antenna aperture application approximately array attenuation bandwidth beam calculated CCIR channel characteristics circuit coefficient component configuration correlation dielectric diffraction dipole distribution Doppler edge effects electric field electromagnetic element elevation angle equation error experimental filter fleldstrength frequency function geometry given grid ground plane height IEEE IEEE Trans impedance incidence input integral integral equation ionospheric layer length linear lobe log-periodic antenna loss magnetic main lobe matrix measurements method microwave Mininec mode multipath obtained optimisation parameters path performance permittivity phase phased array planar plane wave polarization prediction problem Proc propagation pulse radar radiation pattern radio radiometer radome rainfall range receiver reflection reflection coefficient reflector region resonance satellite scan scattering shown in Figure shows sidelobe signal slot solution space spectrum structure surface techniques temperature terrain transmission transmitter values variation vector waveguide wavelength wire