Broadband Dual-Polarization Microstrip Antenna with High Cross-Polarization Isolation for SAR Application

Theoretical analysis and simulation verification of the method of widening the bandwidth and improving the cross-polarization isolation of the dual-polarization microstrip antenna array are presented in this paper. Multiple-resonators technique has been used to extend the bandwidth. Anti-phase and sequential rotation feeding techniques are adopted to improve the cross-polarization isolation. Two kinds of linear array with different number of elements are demonstrated respectively. Simulated results show that the characteristics of broadband and high cross-polarization isolation are achieved by employing the abvoe techniques.