A novel broadband dual polarization cavity-backed microstrip antenna

In this paper, a dual polarization cavity-backed microstrip antenna based on printed board technology is proposed. The impedance bandwidth of the antenna exceeds 65%. The isolation of two ports is less than -20dB in the range of 5.91GHz to 11. 48GHz, and in the range of 8.41GHz to 10.62GHz, the ports' isolation is less than - 30dB, with the bandwidth about 64% and 32% respectively. In addition, a 10×10 array are simulated, in the band, the cross polarization in the end firing direction is lower than -30dB. And the radiation patterns of 7GHz, 9.6GHz and 12GHz show that the cross polarization level of the antenna in all direction is lower than -30dB. In a word, the antenna achieves large bandwidth and ensures good isolation between ports and low cross polarization level. Moreover, it's performance changes little after forming array, so it has certain practical value.