Four antennas on smart watch for GPS/UMTS/ WLAN MIMO application

The paper presents a design with four antennas on smart watch for GPS/UMTS/WLAN MIMO application. The overall dimensions of the design are 40 mm × 40 mm × 5.4 mm. The size of the main ground plane is 40 mm × 40 mm × 0.4 mm. These antennas are using the coupled-fed architecture. They are fed by 50-ohm mini coaxial cable lines. The four antennas are placed vertically to the edges of the main ground plane. The GPS and UMTS antennas are designed as open slot antennas; the two WLAN antennas are designed as monopole antennas. The obtained bandwidths can cover the bands of GPS/UMTS/WLAN MIMO; the isolation between these antennas is larger than 15dB. The design covering UMTS (1.92-1.98 GHz, 2.11-2.17 GHz), GPS (1.575 GHz), MIMO WLAN (2.4-2.484 GHz) and with compact and easy to design is good for antennas of smart watch devices.