高增益高隔离度毫米波MIMO天线

High gain and high isolation MIMO antennas for millimeter-wave application

文中介绍了一种高增益高隔离度的四阵元工作在35 GHz的MIMO天线,各天线单元采用微带馈电。通过在天线上方加载引向器使天线获得较高的增益,通过地板上刻旋转45°的十字型槽同时在天线表面介质板上加载十字型寄生元可以有效降低天线间的耦合提高端口隔离度。利用HFSS软件对其辐射性能进行仿真和优化,优化得增益为12 d B,旁瓣电平优于-11 d B,反射系数低于-10 d B的工作带宽为2.76 GHz,端口隔离度优于-35 d B。将该天线进行加工和测试,实测结果表明,天线在35 GHz时天线增益为11 d B,旁瓣电平优于-10 d B,反射系数低于-10 d B的工作带宽为1.78 GHz,端口隔离度优于-40 d B。

A four-element millimeter-wave multiple-input multiple-output（ MIMO） antenna at 35 GHz with high gain and high isolation performance is presented. Each antenna element is excited by a microstrip line. A wave-director above the array antenna is used to enhance the gain while the high isolation can be realized by using 45°-rotated cross-shaped slots etched in the ground and cross-shaped parasitic element on the surface of antenna. The radiation performance is simulated and optimized by HFSS. The optimized gain is 12 d B,the level of the sidelobe is less than- 11 d B,the reflection coefficient less than- 10 d B is 2. 76 GHz and the port isolation is better than- 35 d B. The antenna prototype is fabricated and measured. The measured result show that the gain is 11 d B,the level of the sidelobe is less than- 10 d B,the reflection coefficient less than- 10 d B is 1. 78 GHz and the port isolation is better than- 40 d B.