Wide-band planar arrays for radar applications

This article presents the development of printed antennas arrays with formed patterns, operating in a 15% over 20% bandwidth (in C and X bands), with mono or dual linear polarization and intended for radar applications. These arrays are created by multilayer radiators fed across the slots, by a corporate feed distribution of microstrip lines and power dividers like Wilkinson (1960) and (or) hybrid rings. They are optimized in order to observe a good polarization purity (/spl sim/-25 dB), and a weak sidelobe (/spl sim/-25 dB) and cross-polarization level (/spl sim/-25 dB).