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amplitude analysis angle antenna pattern aperture application approximately array antenna attenuation axial ratio azimuthal bandwidth batwing antenna beam boundary calculated Cassegrain antenna characteristics circuits circular coefficient components computed cross-polarized current distribution cylinder dielectric diffraction dipole direction effects electric field electromagnetic element equivalent excitation feed ferrimagnet finite frequency function geometry ground plane Helical Antennas helix horn IEEE IEEE Trans incident input impedance integral equation length linear lossy magnetic matrix measured method Microwave mode monopole monopole antenna mutual coupling numerical obtained parameters phased array planar plane wave polarization problem propagation radiation pattern radome rectenna References reflection reflector antenna region resonance scan scattering shown in Figure shows sidelobe sidelobe level signal slot Slot Antennas solution space spherical spiral antenna structure strut subreflector surface wave symmetric technique theory tion trap twin loop antenna Unimoment values vector voltage VSWR waveguide wavelength wavenumbers wire