MIMO antenna with Wi-Fi and Blue-Tooth for smart watch applications

This paper presents an Inverted-F Antennas (IFAs) type MIMO antenna with Wi-Fi and Blue-Tooth band for smart watch application. The overall dimensions of 40×40×5.4 mm
³
of the proposed design consisting of an antenna portion of 40×5×0.1 mm
³
and system ground portion of 40×40×0.4 mm
³
. The antenna geometry is composed of two identical IFA antennas extended from the two side of the ground, which designed on the FR4 substrate. The distance between both antennas is 40 mm. The measured results show that S11 is lower than -10 dB and the isolation S12 is better than -15 dB across the bands of Wi-Fi and Blue-Tooth. As these antennas are dedicated to be placed in watch, the influence of ABS and screen on the smart watch for the antenna performances is also investigated. The proposed antenna design also has good performance and small size.