Compact Broad-Band Waveguide Antenna Element For Phased Array in Ka-Band

For broad-band synthetic aperture radar applications, a compact waveguide array antenna with broad operating frequency band is investigated in this paper. Ridged waveguide and square horn are used for broadband operating, and the size of the antenna element is much smaller than the traditional horn. The phased array providing more than 28% bandwidth with VSWR better than 2 in Ka band. The better angle scan performance of the array antenna can be obtained. The radiation patterns of the phased array are presented.