Multipolarized Wideband Circular Patch Antenna for Fifth-Generation Multi-Input–Multi-Output Access-Point Application

A multipolarized wideband circular patch antenna for multi-input-multi-output operation in the fifth-generation band of 3300-4200 MHz is presented for access-point applications. The circular patch antenna is excited by three probe feeds (Ports 1-3) equally spaced by 120° to generate three different polarized waves in the fundamental (TM11) mode. Each port on the circular patch is surrounded by a printed ring slot to achieve good impedance matching and isolation, thereby achieving good antenna performance in 3300-4200 MHz (measured efficiency better than about 88% and peak antenna gain about 6.6 dBi). Additionally, very low measured envelope correlation coefficients (<;0.05) of the three generated waves are obtained.