## 1 Introduction  
The interest in wireless applications in the communication environment is increasing in recent years with particular focus on wearable and textile antennas. One of the most important characteristics of wearable antenna is the wide variety of applications they lend themselves to: mobile communications, wireless medical, and military applications, and, for this reason, there is not a standard for this type of antenna [1, 2, 3, 4]. Furthermore, the frequency spectrum involved in this technology is huge: it ranges from the frequencies typical of the GSM communications up to the 5G spectrum [5]; the diffusion of this new technology is widespread: smart watch, medical sensors, smart clothing, smart glasses, wearable camera and so on [6]. Since the wearable devices are often integrated into the user's clothing, the wearable antenna must be lightweight, thin, easily integrated into the garment, and it should not obstruct the user's movements [7]. Moreover, the position of the antenna relative to the human body is a crucial aspect since, because of that, the wearable device may vary from its original setting and consequently, its performances could change. For example, the bending effect of the antenna can often occur, and it has been deeply studied [2, 8] revealing that it could detune the antenna, compromising its correct functions [9]. Due to the very close position of the antenna to the user's body, the assessment of the human exposure to the electromagnetic field (EMF) emitted by wearable devices is needed. Until now, most of the studies have been focused on the assessment of the EMF human exposure in specific configurations of the antenna with respect to the human body; for instance, [PERSON] et al. [5] have reviewed the literature regarding the assessment of the EMF emitted by the wearable devices showing that most of the reported articles evaluated the EMF exposure mainly considering a single human model or a simplified phantom, made of three or four layers (e.g., [10, 11]) reproducing the layers of a generic superficial part of the human body. Furthermore, the analysis of the interactions between the antenna and the human body is often addressed with the aim to study if and how the performances of the antenna vary in the presence of the human body [12]. For all these reasons, the aim of this work is specifically to assess the exposure of the human being to the EMF emitted by a wearable antenna belonging to the typical spectrum of the wearable devices: it is tuned at f = 2.45 GHz, that is the characteristic frequency of the ISM (Industrial, Scientific, and Medical) band, used for the devices designed for the health monitoring of the user. A typical field of application of this type of wearable devices is the military environment [13] since the physiological parameters of the soldier during a mission, monitored and scanned by the wearable device, are important data to be communicated. Therefore, we will refer to this occupational exposure situation in the following of the study. The proposed study takes place in this context and our aim is to further broaden the knowledge on the assessment of the exposure of the human being to the EMF emitted by a wearable antenna. More in details, EMF human exposure assessment has been evaluated by means of electromagnetic computational method considering the wearable antenna posed in six different positions on the human body, mimicking different realistic exposure conditions. This will allow to evaluate the effect of the antenna position on the human exposure, in order to understand if and how the variation of the involved anatomical district could significantly influence the exposure. Moreover, to evaluate how the interindividual anatomical variability could impact on the level of exposure, two different human models were used, one of an adult male and one of an adult female. Indeed, there are differences in the anatomy models depending on the gender that could impact on the exposure level.