Abstract

Overview

Regulators require wireless power transfer (WPT) systems and other sources of strong magnetic fields to adhere to defined basic restrictions (BR), which are limits set on the fields induced in the human body.

Findings

• Local sources such as WPT transmitters produce non-uniform fields that may exceed reference levels (RL) locally, but the induced fields remain well below BR.
• The study introduces an efficient evaluation method using a homogeneous phantom along with coverage factors to consider local field enhancements.
• Coverage factors ranging from 1 to 9 depend on various dosimetric quantities and significantly reduce the need for numerous simulations.
• A single simulation with coverage factors can replace hundreds, facilitating experimental tests without further simulations.
• Minimal simulations may underestimate exposures by more than 10 dB when only a few use-case simulations are run with anatomical models.

Conclusion

The introduction of coverage factors based on statistical analysis offers a streamlined, effective approach to compliance testing against BRs, even in the presence of significant field enhancements.