Antenna Decoupling Based on Characteristic Modes Cancellation  

作　　者：CHU Qingxin ZENG Wenfeng 

机构地区：[1]School of Electronic and Information Engineering,South China University of Technology,Guangzhou 510640,China

出　　处：《Chinese Journal of Electronics》2022年第6期1138-1145,共8页电子学报（英文版）

基　　金：supported in part by the National Natural Science Foundation of China(61671207);the Key Program of Marine Economy Development(Six Marine Industries)Special Foundation of Department of Natural Resources of Guangdong Province(GDNRC[2020]009)。

摘　　要：The demand for a high transmission data rate in 5G leads to the wide application of the multi-input,multi-output(MIMO)technique.However,the narrow design space in mobile phone causes severe unexpected coupling between antenna units and deteriorate the system performance dramatically.In this paper,we focus on the antenna coupling within the MIMO system.Some decoupling techniques are summarized,such as neutralization line,decoupling network,common/differential mode cancellation,etc.Finally,new decoupling research developments of modal currents cancellation based on the theory of characteristic mode are elaborated.Two design examples are shown to validate the benefit of the proposed decoupling method.The-6 dB impedance bandwidth of the head-to-head antenna pair can cover 3.4–3.6 GHz.The isolation level is improved from more than 3.7 dB to more than 13 dB.The tail-to-tail antenna pair can cover 3.3–5 GHz and the isolation level is improved from more than 5 dB to more than 10 dB in the whole operating bandwidth.Both antenna pairs can achieve an envelop correlation coefficient of less than 0.2 and the antenna efficiencies are more than 40%.

关 键 词：Antenna decoupling Characteristic mode Mobile phone antenna MIMO antenna 

分 类 号：TN929.5[电子电信—通信与信息系统] TN820[电子电信—信息与通信工程]