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amplitude analysis angle aperture approximation axial ratio azimuth bandwidth beam beamwidth broadside calculated circuit circular polarization coefficients computed configuration corrugated cross-polar curved cylindrical Dept dielectric dielectric constant diffraction dipole direction dual E-plane edge effects electric field Electrical Engineering electromagnetic Electronics element pattern equation error excitation experimental feed Fourier frequency Fresnel gain geometry Green's function ground plane horn IEEE IEEE Trans incident input impedance integral Laboratory linear array lossy magnetic matrix measured method method of moments microstrip antennas Microwave mode monopole mutual coupling null obtained Ohio State University optical parameters patch performance phased array planar plane wave probe problem propagation radar radiation pattern rectangular reflector antenna region resonant scan scattering shaped shown in Figure sidelobe sidelobe level signal Slot Arrays solution space spherical strip structure subarray subreflector substrate surface taper technique theory tion values vector VSWR waveguide wavelength wire