一种高隔离低交叉极化等相位中心双极化开槽天线设计

A High Isolation Low Cross-Polarization Coincident Phase Center Dual Polarized Flared Notch Antenna

设计了一种高隔离度低交叉极化等相位中心双极化开槽天线,通过对馈电巴伦进行改进设计,解决了两个正交极化开槽天线交叉排布时相位中心不一致难题。由于双极化天线的辐射和馈电部分完全对称,该天线可获得良好的端口隔离度和低交叉极化特性。仿真结果表明,与常规双极化开槽天线相比,该双极化天线的交叉极化可改善20 dB,90%频带内的隔离度提高15 dB以上,并且该双极化开槽天线在数倍频程带宽内具有良好的匹配和辐射特性,能实现大角度二维扫描,适用于未来宽带多极化相控阵天线系统。

A high isolation low cross-polarization coincident phase center dual polarized flared notch antenna is designed in this paper.The problem of two feed baluns interfere both mechanically and electrically can be best solved by improving Marchand-type balun.The high degree of symmetry of this dual polarized antenna leads to low cross-polarization and high isolation between the orthogonal polarizations.Compare with commonly used flared notch antenna,the simulation results demonstrate that cross-polarization is improved 20 dB,and isolation is improved 15 dB in 90%bandwidth.And this antenna has good performance with wide bandwidth for wide angle scan,and is suitable for wide-band and dual polarized phased array systems.