Dual-element multiple-input-multiple-output system for sub-6 ghz (5g) and wlan applications with enhanced isolation

Abstract

—A dual-band two-port MIMO antenna with very high isolation is proposed for 5G/WLAN application. The overall size of the MIMO antenna is (18 × 44 × 0.8) mm3. The unequal arm of the Inverted-F Antenna (IFA) is the reason for the dual bands. Bending and extending one of the arms with the staircase shape is responsible for the proposed dual-bands having resonant frequency at 3.45 GHz (3.3 GHz–3.65 GHz) and 5.1 GHz (4.8 GHz–5.5 GHz) respectively with percentage impedance bandwidth of 10% and 13.6%, respectively. The proposed antenna uses a simple decoupling structure based on a wide inverted T-shaped slot to achieve good isolation (better than 18 dB and 34 dB respectively for the dual-bands) between the ports. The envelope correlation coefficient (ECC) and channel capacity loss (CCL) are within the acceptable limits.