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A Self-Isolated Wideband Circularly Polarized MIMO Antenna for 5G communications

A compact planar dual-element broadband circularly polarized (CP) MIMO antenna is presented. The proposed antenna contains two elements arranged adjacent to each other, high isolation can be obtained without utilizing any extra decoupling structures. By loading an L-shape stub and inserting a horizontal slot on the ground, wide impedance bandwidth (IBW) and axial ratio bandwidth (ARBW) are achieved. The measured results suggest that the MIMO antenna can realize wide IBW of 55% (3.92-6.92 GHz) and ARBW of 25.8% (4.04-5.24 GHz), which matches well with the simulated results.