Dual-Band Hexagonal Millimeter Wave MIMO Antenna for 5G Femtocell Implementations

A dual-band hexagonal-shaped planar quad element millimeter-wave Multi-Input Multi-Output (MIMO) antenna is proposed for 5G femtocells applications. Initially, a hexagonal-shaped single element is designed and analysis is performed on Rogers R04003 ™ substrate with Er of 3.55 and & = 0.0027 with a thickness of substrate as 0.8mm. Later the single element is repeatedly placed on four sides of the substrate making a quad element MIMO antenna with four different ports. The Proposed antenna is radiating at 27.5GHz with a gain of 4.7 dBi at port1 and port3 and at port2 and port4, the antenna is radiating at dual bands like 28.5GHz and 38.5GHz with average gains of 4.69dBi and 5.5dBi. The antenna has a total efficiency of 95% with MIMO key performance metrics like envelope correlation coefficient and diversity gains as 0.045 and 9.995 at 10dB. Due to the lower perceptivity of tapping by unauthorized persons, MIMO antennas can be easily incorporated in 5G Femtocells.