Integration of Slot Array with MIMO Antenna for 4G and 5G Applications

A novel ellipsoid slot array integrated with the compact MIMO antenna accomplishes the increasing demand of customers with 4G and 5G application bands. The proposed antenna incorporates a front FR4 layer holding a planar radiator, ground plane etched with ellipsoid slot array and back FR4 layer with the corporate feed network. The corporate feed network delivers power to the framework of 2x4 matrix ellipsoid slot array in the ground plane. The front and the back FR4 layer are detached by the ground plane, which acts as both radiator as well as isolator. The ground plane containing ellipsoid slot array antenna resonates at 17 GHz. It also provides 25 dB isolation in the LTE application bands. This antenna arrangement achieves the impedance bandwidth of 600 MHz (2-2.6) GHz for LTE 2300 MHz, LTE 2500 MHz and 2 GHz (15-17) GHz for 17 GHz 5G application band. Apart from this, the simulated gain of 3.33/4.67/7.5 dBi and measured gain of 3.01/4.58/7.3 dBi is achieved for resonating frequencies such as 2.3/2.5/17 GHz. High efficiency of 84/91/90% is obtained for microwave and millimeter wave frequencies. Envelope correlation coefficient evaluated from the radiation pattern is found to be <0.5.