Dual MIMO Antenna System for 5G Mobile Phones, 5.2 GHz WLAN, 5.5 GHz WiMAX and 5.8/6 GHz WiFi Applications

A multi-purpose dual Multiple-Input-Multiple-Output (MIMO) antenna system for 5G mobile systems is presented in this paper. The proposed antenna consists of two sets of MIMO antennas on a single board. The 8-port MIMO antenna, placed on the board, is working over 3.5 GHz (3.4 GHz-3.6 GHz) 5G band with dimensions 150 mm <inline-formula> <tex-math notation="LaTeX">$\times70$ </tex-math></inline-formula> mm. The 4-port MIMO system, placed on the chassis, is operating over 5.2 GHz WLAN/5.5 GHz WiMAX/5.8 GHz/6 GHz WiFi band with dimensions 20 mm <inline-formula> <tex-math notation="LaTeX">$\times $ </tex-math></inline-formula> 7 mm. The prototype is designed and fabricated on FR4 (<inline-formula> <tex-math notation="LaTeX">$\epsilon _{r}=4.4$ </tex-math></inline-formula> and <inline-formula> <tex-math notation="LaTeX">$\tan \delta =0.02$ </tex-math></inline-formula>) substrate with 0.8 mm thickness. The overall design of the entire dual MIMO system is very minimal leaving ample space for other components to be placed on the board. The presence of two separate MIMO antennas in the proposed prototype aids in using the 5G frequencies and 4G frequencies independently. Since no active elements like diodes, switches etc. are involved in the proposed design to switch between different bands, the prototype is free from any ohmic losses. It is also worth noticing that the proposed antenna operates in the highly anticipated next generation WiFi 6E spectrum.