## 1 Introduction  
The increasing need for high data rate mobile communications, mainly driven by video streaming and cloud computing, has led to fast development of heterogeneous fifth-generation (5G) cellular mobile networks expected to exploit the lower part of the millimeter-wave (mmW) band. In particular, the 60-GHz band has been identified as an attractive solution for radio access and backhauling in the future mmW systems [1]. The deployment of mmW small cells will allow for larger channel bandwidth, higher data rates, secure short-range communications, low interference with adjacent cells, and compact systems [2; 3; 4; 5]. Wireless devices, such as mobile phones, tablets, and laptops are intended to be used in the vicinity of the human body (e.g., phone call or browsing scenarios), and they should comply with the exposure limits. Below 6 GHz, the specific absorption rate (SAR) is used as the main dosimetric quantity [6; 7]. In the 6-300 GHz range, the electromagnetic energy is deposited predominantly in superficial tissues (the penetration depth is approximately 0.5 mm at 60 GHz [8; 9; 10; 11]). As a consequence, the International Commission on Non-Ionizing Radiation Protection (ICNIRP) and the Institute of Electrical and Electronics Engineering (IEEE) recommend, respectively, the absorbed power density and epithelial power density as the main dosimetric quantities. Both the ICNIRP and IEEE set the limits to 10 mW/cm\({}^{2}\) for occupational environments (referred to as restricted environments in the IEEE standard), and 2 mW/cm\({}^{2}\) for the general public (referred to as unrestricted environments in the IEEE standard). Above 6 GHz, the power density is to be averaged over 4 cm\({}^{2}\) and 6 min. Moreover, from 30 to 300 GHz, the power density is to be averaged over 1 cm\({}^{2}\) and must not exceed two times the exposure limit for 4 cm\({}^{2}\). The existing dosimetry systems [12; 13; 14] are designed to measure the incident power density in free space close to a wireless device under test. In [12], the incident power density is obtained from the measurement of the magnitude and polarization of the E-field, whereas in [13] it is determined from the measurement of both the E- and H-field using the two-probe method. Both [12] and [13] use field probes from 6 to 110 GHz allowing for measurements down to 2 mm and 0.5 mm from the device under test, respectively. The system presented in [14] uses a multi-probe technology combined with switching networks for spherical near-field measurements in the 18-50 GHz range to retrieve the incident power density. When an antenna is placed in the vicinity of a lossy medium, such as human skin, electromagnetic contrast at the air/skin interface results in the appearance of scattered field and near field interactions, which modify the field impinging the human body compared to the free-space radiation [15; 16]. Hence, in free-space measurements of the incident power density, variations of the power density due to the coupling of a wireless device with the human body are not taken into account. This coupling may impact the power absorption in the human body as well as resulting heating [17]. Various aspects related to the interactions of mmWs with the human body have been reviewed in the literature. The study performed in [18] for a terminal with a 60-GHz antenna module for several representative human body exposure scenarios, showed that both hand and head, located in the antenna near-field region, significantly affect the antenna reflection coefficient, radiation pattern, and efficiency. The alteration of the antenna radiation characteristics by the human body in the near-field may therefore affect the total field impinging the body.