Antenna Decoupling Based on Characteristic Modes Cancellation

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