一种用于MIMO系统的三频段天线阵设计

介绍一种用于MIMO系统无线移动终端的小型化天线阵.单个天线采用平面倒F天线(PIFAs),地板尺寸为100 mm x60 mm,天线工作频率:885-915 MHz,1 760～1 870 MHz和2 450～2 510 MHz.为了使天线阵的体积变小,天线之间的距离远小于半波长,这就带来了另外的问题:天线之间的耦合...

Design of a Tri-Band Antenna Array for the MIMO System

A low-profile antenna array for multiple-input-multiple-output（MIMO）-enabled wireless communication terminals is introduced.The chosen planar inverted-F antennas（PIFAs） which are etched on a compact board with dimensions of 100×60 mm2 are intended to operate at the following frequency bands： 885-915 MHz,1 760-1 870 MHz and 2 450-2 510 MHz.In order to obtain a very compact system,the distance between the PIFAs is severely reduced to less than a half wavelength（12 mm=0.036λwhen the antenna work at 0.9 G）.This leads to another problem： the mutual coupling between PIFA antenna array elements is too high.To improve the isolation between the two closely packed antennas,two methods are proposed.One is to use a suspended neutralization strip which is inserted and physically connected to the antenna elements to improve isolation.The other is to use FR4 and simple round plane modification to reduce coupling.The simulation results show that a 15 dB mutual coupling is obtained over the operating bandwidth without affecting the radiation patterns obviously.