一种基于椎体振子的宽带MIMO天线设计

Design of a Wideband MIMO Antenna Based on Conical Element

针对目前轨道交通车地间海量的通信需求和现有车载公网天线存在带宽窄、增益低和隔离度差等性能缺陷的现状,设计了一款车载式宽带线极化4通道MIMO天线,可支持目前公网运营商4G、5G的主流频点。宽带MIMO天线由4个半圆形椎体振子组成,通过优化振子结构、调整振子间距和在振子间增加金属隔离铜片等方式,弥补了以前设计的同类型天线低频性能差、增益低的缺点,从而实现天线性能的最优化。使用Ansoft HFSS仿真的结果表明,天线工作频段可达0.7~4 GHz,带内增益4.6~8 dBi,相邻天线振子间端口间隔离度≥20 dB。

Given the current train-ground communication demand of rail transit and the narrow bandwidth,low gain and poor isolation of the existing vehicle-mounted public network antennas,a vehicle-mounted wideband linearly polarized 4-channel MIMO antenna is designed,which is able to support the 4G and 5G mainstream frequency points of current public network operators.The wideband MIMO antenna,made up of four semicircular conical elements,eliminates the defects such as bad low frequency performance and low gain of the same type antennas previously designed and optimizes the antenna performance by methods such as optimizing the structure of the vibrators,adjusting the spacing between the conical vibrators and increasing the metal sheets between the vibrators,etc.The Ansoft HFSS simulation result indicates that the operating frequency of the antenna reaches 0.7~4 GHz,the in-band gain is up to 4.6~8 dBi,and the isolation degree between adjacent antenna elements ports is≥20 dB.