Dual-Polarized Low-Sidelobe Array Antenna Consisting of Power-Weighted Networks and Series-Fed Subarrays

A dual-polarized low sidelobe level monopulse array antenna consisting of two types of series-fed resonant slot antenna subarrays and partially corporate-fed networks has been designed. The optimized vertical polarization subarray exhibits significantly improved impedance bandwidth. Amplitude tapering between individual elements of the subarray, in conjunction with power-weighted feed networks, suppressed the sidelobe levels in both the xoz and yoz planes. Measurements indicate that the -10 dB impedance bandwidth at each port exceeds 10%, the sidelobe levels are below -19 dB, and the relative null-depths are less than -37 dB.