Compact Dual-Band Circular Smartwatch Antenna for Biomedical Applications

A circular dual-band smartwatch antenna operating at the 2.4 GHz Wi-Fi/BT and 4.7 GHz (5G) frequency bands is presented and studied in this work. The proposed antenna was analyzed both in free space and when it was worn on a human hand. Furthermore, the impact of smartwatch operation on antenna performance was also investigated. The antenna demonstrated high and stable performance in all scenarios. The specific absorption rate (SAR) was also analyzed for health risk concerns, and the obtained values ensure the wearer's safety. Ultimately, the dual-band antenna proves to be a promising candidate for biomedical applications.