Conceptually New IR-Based Approach for Fast User Exposure Compliance Testing Above 6 GHz

This article presents a novel method for fast absorbed power density (APD) measurement using a reflectivitybased phantom that mimics the scattering characteristics of the human skin and allows effective conversion of the absorbed mmWave power to heat. The thermal footprint formed by the induced heat at the back surface of the phantom is remotely recorded by an infrared (IR) camera and used to retrieve the APD at the air/skin interface. This new technique is validated using IEC reference antennas (cavity-fed dipole array and pyramidal horn loaded with a slot array). The results demonstrate its highly promising potential for experimental dosimetry and user exposure compliance testing of wireless devices operating above 6 GHz with a remarkable reduction in the measurement time compared to the conventional RF scanning probe approach.