WLAN MIMO antennas with a GPS antenna for smart watch applications

The paper presents an antenna design of smart watch with WLAN MIMO antennas and a GPS antenna. The overall dimensions size of the design is 40 mm × 40 mm × 5.4 mm. There are four WLAN antennas and a GPS antenna in the design. The size of ground plane is 40 mm × 40 mm. The antennas are fed by 50-ohm mini coaxial cable line. The PIFA type is adapted to design the antennas of GPS (1.575 GHz) and WLAN (2.4 - 2.484 GHz) band. The four WLAN antennas are placed on proximity of the four corners of four border of the smart watch; the GPS antenna is placed the part of the ring of the smart watch. The simulated and measured S
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(I = 1 to 5) results are below of -6 dB and isolation between these antennas are also larger than 10 dB.