Contents I. Introduction
Smartwatches have rapidly evolved from simple timekeepers into advanced wearable devices seamlessly integrated into our daily routines. These compact and stylish companions serve as extensions of our smartphones, health trackers, personal assistants, and even our portals to the ever-connected digital world [1]. Particularly, smartwatches play a significant role in the medical field with the potential to revolutionize healthcare by enabling continuous monitoring, personalized care, and improved patient engagement [2]. A critical component of a smartwatch is the antenna that enables their wireless connectivity and communication capabilities. Despite their numerous benefits, smartwatch antennas should be carefully designed to overcome specific challenges and to operate within some constraints. Due to the limitations imposed by the physical space available for integration and the lossy nature of the human body, the antenna should be compact, efficient, together with robust performance [3]. Moreover, smartwatch antennas must comply with SAR limits and guidelines to ensure the wearer safety [4]. Although smartwatch antennas have gained meaningful progress recently, most of the studied antenna are single band antenna covering the 2.4 WiFi/ BT band [5], the 2.45 ISM band [6], or the GPS Band [7]. However, dual-band antennas are favored over single band antenna since they enable the smartwatch to operate simultaneously in multiple frequency bands, providing compatibility with a wide range of wireless technologies which enhances the connectivity options available to the smartwatch, ensuring seamless integration with various networks and expanding its communication capabilities. Therefore, a dual-band antenna that cover both the Wi-Fi/BT and 4.7 GHz (5G) bands is studied in this work.
