一种小型化高隔离MIMO吸顶天线

Design of a Miniaturized Ceiling-mounted MIMO Antenna with High Isolation

提出了一种小型化高隔离MIMO吸顶天线设计方案。天线由水平极化印刷对数周期天线环形阵列内嵌于垂直极化单锥天线组成,并通过在单锥天线上正对对数周期天线轴处各开一个狭缝,实现了吸顶天线的全向辐射性能和双极化工作性能。嵌套结构的引入不仅大大减小了双极化吸顶天线的结构尺寸,还实现了吸顶天线极化间的高隔离性能。采用HFSS对其进行仿真和优化,得到该吸顶天线垂直极化工作频率为790~960 MHz/1 700~2 700 MHz,水平极化工作频率为2 300~2 700 MHz,同频隔离度优于44.5 dB,并且两个极化的增益和全向性均良好。该吸顶天线结构简单,便于加工制作,且成本较低,具有较高的实用价值。

A miniaturized ceiling-mounted MIMO antenna wi~ high isolation is proposed. The antenna is made up by embedding a horizontally polarized circular array of four printed log-periodic antennas（PLPDAs） within a vertically polarized mono-conical antenna. And by opening four proper slits on the mono-conical antenna which exactly face to the axis of each log-periodic antenna, it gets omni-directional patterns and good performances of dual-polarization. The introduction of a nested structure, not only greatly reduces the size of the structure, but also achieves high isolation. Using HFSS the ceiling- mounted antenna is modeled and simulated. The operating frequency band for the vertically polarized part is 790 - 960 MHz/1 700 - 2 700 MHz, and 2 300 - 2 700 MHz for the horizontal polarization, the polarization isolation is better than 44.5 dB, and the radiation patterns are good for both polarizations. The structure of the ceiling - mounted antenna is featured by simple structure, easy to manufacture, lower cost and high practical value.