A Self-Decoupled MIMO Antenna Design for Metal-Rimmed Mobile Phones

A self-decoupled MIMO antenna design with orthogonal modes using a modified branch line coupler is presented in this paper. Two orthogonal modes can be excited by introducing this modified coupler, so a self-decoupled radiator-shared MIMO antenna design can be achieved. The results show that across the decoupling bandwidth of 3.4 – 3.6 GHz, the reflection coefficient is better than -7 dB and the isolation is better than 24 dB.