A Compact Dual Band Millimeter-Wave CSRR Loaded MIMO Antenna Array System for 5G Applications

In this paper, a compact two-element multiple input multiple output (MIMO) antenna array system is presented in millimeter-wave (mm-wave) spectrum having dual-band functionality, high gain, good isolation, and broadside radiation pattern. Firstly, a single antenna is designed by loading a complementary split ring resonator (CSRR) unit cell on a conventional patch. An array structure, consisting of 2 antenna elements, is then realized using a dual-band T-junction power divider. Finally, the 1 x 2 MIMO antenna array system is designed by intelligently placing the array units to achieve a compact topology with an overall dimension of 47 mm x 25.25 mm. The proposed geometry exhibits broadside radiation at 28 GHz as well as 38.8 GHz with peak gains of 10.48 dBi and 11.21 dBi, respectively, and good isolation values (> 15 dB) over the operating bands. The suggested antenna system is appropriate for 5G applications in the mm-wave frequency range.