Investigation of the impact of electromagnetic fields emitted close to the head by smart glasses

Biomed Tech (Berl). 2022 May 17;67(3):219-226. doi: 10.1515/bmt-2021-0301. Print 2022 Jun 27.

Abstract

The functionality of smart glasses includes the possibility of wireless communication. For this purpose, WiFi or Bluetooth modules are integrated into the glasses. They emit electromagnetic radiation in the vicinity of the user's head. This simulation study investigates the impact of varying positions, frequencies, and antenna types of the embedded WiFi or Bluetooth modules on different tissue types in the human head. The absorption of electromagnetic energy causes the main impact on the tissue in the head. This physical process is best described by the specific absorption rate SAR. To investigate the effects of position, frequency, and antenna type on the simulated SAR values multiple simulations have been carried out considering real-world applications of smart glasses. The results show that the type of antenna has little effect on the SAR values of the different tissues. The maximum regulated output powers explain the frequencies' impact on the exposure. According to our findings, the greatest influence on the SAR values can be attributed to the placement of the antenna. Finally, our study reveals that positioning the antenna at the front side of the head is optimal for most tissues because of its maximal distance to the head tissues.

Keywords: P-EM-FDTD; SAR; antenna design; human tissue; simulation; wireless devices.

MeSH terms

  • Computer Simulation
  • Electromagnetic Fields*
  • Head
  • Humans
  • Smart Glasses*