一种新型双极化口径耦合微带天线单元的研究

本文在比较了一些微带天线实现双极化思路后,提出了一种新型高极化隔离度和低后向辐射的双极化微带贴片结构:即在口径耦合单元的馈线上增加一对对称寄生微带线调节枝节,进行匹配阻抗和实现高极化隔离度,并利用H形口径耦合,减小贴片单元的后向辐射,提高天线的辐射效率。该结构简单,调节简便,馈线网络占有面积较小,且易做成更大规模的双极化天线阵,非常适合现在高分辨率双极化合成孔径雷达和抗多径干扰高的移动通讯系统的需要。文中给出了仿真和实测结果,吻合较好,从而证明了设计的有效性。

Study on the Novel Dual-Polarization Aperture Coupled Microstrip Antenna Element

After being compared between some methods of dual-polarization microstrip antenna,a novel design of dual-polarization microstrip patch antenna with high isolation and low back-radiation is proposed in the paper.The high polarization isolation,impedance match and low back-radiation and high radiation efficiency are realized by adding a pair symmetrical parasitic stub in the feed line of antenna element with the H shape coupled aperture.The simple structure is tunable and compact,easy to be fabricated in a dual-polarization large array.It can be used in the high resolution and dual-polarization synthetic aperture radar(SAR) system and the mobile communication systems with high anti-multipath interference.The results of the simulated and experimental ones are presented and in good agreement,showing the validity of this design.