Smart-Watch Integrated Flexible Strap Antenna for Enhanced WiFi and Bluetooth Connectivity Applications

This paper presents a smartwatch strap-embedded antenna tailored for WiFi and Bluetooth-based applications within the 2.4 GHz frequency bands. Placing the antenna within the smartwatch strap rather than the watch's housing with other electronic components mitigates electromagnetic interference, ensuring optimal antenna performance in wireless communication applications. The antenna exhibits a realized gain of 10.21 dBi in the unbent case and 7.23 dBi when bent at an angle of 125°. The input power of 50 mW (17 dBm) is utilized for specific absorption rate (SAR) analysis when averaged over 10g of human tissue. The SAR result indicates a safe radiation level of 0.90 W/kg, well within the ICNIRP-specified limit of 2 W/kg over 10g of tissue. This research contributes to the enhancement of smartwatch communication capabilities by facilitating the provision for an antenna to be embedded while ensuring compliance with rigorous safety standards.