A Planar Diversity Loop Antenna Array with Improved Properties for 5G Mobile Phones

A new diversity multiple-input/multiple-output (MIMO) antenna array with improved characteristics is introduced for fifth-generation (5G) mobile phone applications. Eight compact loop resonators are placed at different edges of the mobile-phone mainboard with 75x150x0.8 mm
³
FR-4 dielectric. By addling modified arrow strips protruded among the adjacent loop antennas, the operation bandwidth and mutual coupling of the antenna radiators have been significantly improved. The MIMO antenna is designed to cover the sub 6 GHz spectrum of 5G network and provides a wide bandwidth of 3.2-4 GHz. The MIMO performance, user-hand effect, and fundamental properties of the proposed antenna design are studied.