Abstract: New expressions for input and mutual impedance of corner-fed dual-polarized patch antenna double-and corner-fed by microstip line are derived on the basis of Green function method. Array patterns of the co-and cross-polarization are calculated by using the cavity theory. A 4×4 dual-polarized array integrated with low-noise amplifiers is designed and tested. An extra gain of 12dB comparable with the respective passive array is achieved at the central frequency. The radiation patterns have nearly no changes with the integrated amplifier, while the cross-polarization is lower than -36dB in the main lobe region. The bandwidth and isolation are largely increased when compared with those of the same array without the amplifiers.

Key words: microstrip antenna array, active antenna, dual-polarization, radiation pattern, lownoise amplifier, Green function method