A Compact Mm-Wave MIMO Antenna for 5G Communication

This paper describes a tiny, high-isolation “multiple-input multiple-output (MIMO) antenna” that could be utilized for millimetre-wave (5G) communication without requiring a separate decoupling structure. The shown MIMO architecture was constructed using a microstrip feed-line and two spanner-shaped antenna elements. Improved isolation between the antenna's components is achieved by positioning the parts from one another, without resorting to any additional decoupling architecture. So, below -28 dB isolation is achieved between ports across the full usable frequency range. The presented MIMO antenna has dimensions of 14 mm
$\times 6$
mm
$\times$
0.762 mm 3 and operates over a frequency range of 26.6 GHz to 29.0 GHz. The presented structure is of sufficient quality to prove the approach is practical for a 5G millimetre-wave use.