Abstract

Abstract Overview

A novel measurement system and a 3D field reconstruction method are described aimed at determining the power density in the close near field of wireless devices operating at frequencies ranging from 6-110 GHz.

• Comparisons are made between measurements and simulated results.
• The system achieves an accuracy greater than 0.5 dB for distances surpassing lambda/5 from the radiating source.

Challenges of New Technologies

As 5G technologies enable mobile devices to use millimeter wave frequencies, this progresses challenges for manufacturers and regulatory bodies related to electromagnetic (EM) exposure assessment.

• At frequencies above 10 GHz, exposure limits are dictated by ICNIRP, focusing on power density in air near the body. However, these measures do not correlate with induced fields.

Improved Measurement and Standards

The need for reliable equipment to measure the power density of millimeter wave devices is emphasized, highlighting the discrepancies in prescribed averaging area and its inconsistency across different standards.