Abstract
A design of smartwatch integrated antenna with polarization diversity is proposed. An annular ring is integrated in the framework of smartwatch, and excited by two ports. One port is fed by a coplanar waveguide (CPW) line loaded with a T-shaped matching network, and the other is fed by a coplanar strip line (CPS). The overall model of the proposed antenna has a cylindrical shape with 38 mm diameter and 7.5 mm thickness. A metallic plate is located at the backside of the antenna to mimic the shell of smartwatch. The prototype is fabricated and measured, and the measured results agree well with the numerical ones. The two ports have orthometric radiation patterns and can cover the 2.4 GHz wireless local area network (WLAN) band. The gain of the antenna is higher than 3.2 dBi in free space. The proposed antenna is also analyzed with a cubic tissue model and a wrist model in different distances between the proposed antenna and human models. The performances on body scenarios are also acceptable. The values of specific absorption rate (SAR) in the cubic tissue model and wrist model are below the limitations set by both the Federal Communication Commission (FCC) and the European Telecommunication Standards Institute (ETSI). Envelope correlation coefficient (ECC) shows proposed antenna can be used in multiple input multiple output (MIMO) applications. The influence of battery and printed circuits board assembly (PCBA) on S parameters is obvious, and gain and radiation efficiency are not much affected.
Highlights
Wireless body area network (WBAN) is a small communication network attached to the body
The results of simulation and measurement are analyzed in free space, and with the cubic tissue model and wrist model
The peak gains are higher than 2 dBi of both ports in free space and on body scenarios
Summary
Wireless body area network (WBAN) is a small communication network attached to the body. In recent years, it has attracted increasing attention because it can play an important part in medical detection, fitness training, health care and emergency rescue [1]. Smartwatch is one of the most favorite wearable smart devices It can inform their users of their current location, current time, the steps and the distance they have walked, the prospective weather situation, their physiology parameters, and etc. Most of these data need to be synchronized with other smart
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