Hepta-Mode Terminal Microstrip Antenna for Mobile Wi-Fi 6/6E and UWB Channels 5–11 MIMO Applications

Abstract

A hepta-mode wideband microstrip antenna is proposed for use on the back cover of mobile terminals, targeting Wi-Fi 6/6E and ultrawideband (UWB) channels 5–11 MIMO applications. This multiple-input multiple-output (MIMO) ant- enna design comprises four elements arranged in a sequential rotation pattern, each featuring four small patches with two asymmetric notches. Through proper adjustment of patch and notch dimensions, seven modes are effectively excited by a rotated L-shaped feeding probe, thereby amplifying bandwidth of the proposed antenna. In addition, size miniaturization is achieved using a circle of blind vias. To validate the design strategy, a prototype of the MIMO antenna is constructed with dimensions measuring $60.6\times 60.6\times 2$ mm3. Meeting the requirements for mobile antenna specifications, the proposed MIMO antenna covers a wide range of frequencies, including Wi-Fi 6/6E and UWB channels 5–11, with a measured −6-dB impedance bandwidth of 5.14–9.05 GHz and an isolation of over 12 dB between each antenna element. Combining broad bandwidth, compact dimensions, and a low profile, this MIMO antenna demonstrates significant potential for supporting diverse wireless services on mobile terminals.