基于中和线解耦的小型化MIMO天线设计

Design of Miniaturized MIMO Antenna Based on Neutralization Line

本文设计了一种利用中和线技术来提高隔离度的双频MIMO天线.天线单元采用印刷单极天线的形式,两个工作频段分别覆盖WLAN频率2.45 GHz/5.2 GHz/5.8 GHz.低频谐振单元为倒F天线,通过增加短截线,用以产生高频谐振,实现双频工作.在天线之间增加一个悬置的中和线来提高天线端口之间的隔离度.仿真结果表明,天线两个工作频带分别为2.39~2.53 GHz和4.57~6.09 GHz.天线两个端口之间的隔离度,在低频段内,S 21<-19.3 dB,在高频段内,S 21<-24.6 dB,满足移动通信WLAN频段天线的设计要求.

In this paper,a dual frequency MIMO antenna by using neutralization line technology to improve isolation is designed.The antenna unit adopts the form of printed monopole antenna,and the two working bands respectively cover the WLAN frequency of 2.45 GHz/5.2 GHz/5.8 GHz.The lower frequency resonant unit is an inverted F antenna,and anther stub is added to generate higher frequency.A suspended neutralization line is added between the present antennas to improve the isolation between antenna ports.The simulation results show that the two operating bands of the antenna are 2.39~2.53 GHz and 4.57~6.09 GHz respectively.The isolation between the two ports of the antenna is S 21<-19.3 dB in the low frequency band,and S 21<-24.6 dB in the high frequency band.It is meet the requirements of the WLAN band antenna in mobile communication.