Octave bandwidth dual polarized antenna

It is noted that the requirements in the design of ECM antennas become harder to meet for the lower operating microwave frequency band (S or L). A crossed dipole in the short backfire configuration with high performance over more than a 2:1 frequency band is described. Wideband operation is achieved by a proper design of the dipoles and cavity geometry and of the feeding baluns and sleeves. The dipole length and the distance from the cavity are, respectively, about 1/2 and 1/4 of the wavelength at the center frequency. It is noted that radiation patterns optimization and control are possible by varying the sleeves and the back cavity geometry. Good amplitude and phase pattern optimization is achieved with the circular sleeves geometry and the polygonal cavity geometry.