一种高隔离度的三阻带超宽带MIMO天线设计

A high isolation triple band-notched ultra-wideband multiple-input-multiple-output antenna

针对超宽带传输在无线通信系统中的要求,设计了一种以FR4为介质基板的高隔离度三阻带超宽带MIMO(Multiple Input Multiple Output)天线。该天线由两个水平放置的天线单元组成。通过在U型辐射贴片上腐蚀两个C型槽和在馈线两侧增加两个对称的C型枝节阻断了WiMAX、WLAN和7.5 GHz-X波段的干扰。在接地板上引入一个T型隔离枝节实现了高隔离的特性。实测结果表明:该天线的工作范围为1.89~12.95 GHz,分别在2.12~4.09 GHz,5.18~5.92 GHz,7~8.35 GHz处形成了三个S(11)高于-10 dB的阻带,并且端口隔离度S(21)均低于-20 dB,峰值增益为6.94 dB,包络相关系数ECC均小于0.05,因此在阻断窄带通信的超宽带领域具有良好的应用前景。

A triple band-notched ultra-wideband(UWB)multiple-input-multiple-output(MIMO)antenna on FR4 substrate was designed with high isolation for the ultra-wideband transmission technology of wireless communication systems.The proposed antenna consists of two horizontally placed elements.The interferences of WiMAX,WLAN and 7.5 GHz-X band were interrupted by etching two C-shaped slots on the U-shaped radiation patch and using two symmetrical C-shaped branches on both sides of the feeder.High isolation was achieved by introducing a T-shaped isolation branch on the ground floor.The measured results show that the proposed antenna has a-10 dB impedance bandwidth of 1.89-12.95 GHz,and three stopbands with S11 higher than-10 dB are formed at 2.12-4.09 GHz,5.18-5.92 GHz and 7-8.35 GHz respectively.The port isolation(S21)is less than-20 dB.The peak gain is 6.94 dB,and the envelope correlation coefficient(ECC)is less than 0.05 in the operating bandwidth.It has a good application prospect in the ultra-wideband field for the isolating narrowband communications.