A Millimetre-Wave Tri-Band Antenna Embedded on Smart Watch for Wearable Applications

This paper presents a compact size patch antenna embedded on smart watch for wearable applications. The proposed antenna operates at millimeter-wave frequencies, i.e., 28 GHz, 38 GHz, and 60 GHz for wireless communication applications. A coplanar waveguide (CPW) technique is utilized in this research to keep the size compact. The proposed antenna is printed on a flexible Roger substrate RT Duroid 5880 with a standard thickness of 0.25mm. The overall size of the antenna is 4mm × 3mm × 0.25mm. We observed that the proposed antenna provides stable results when it is simulated on a watch strap along with human tissue like skin. The total radiation efficiency is more than 85% and the gain values of the proposed antenna at 28GHz, 38GHz, and 60GHz frequencies are 5.29dB, 7.47dB, and 9dB, respectively. Hence, the proposed tri-band antenna is a perfect candidate for wearable applications.