D-Phase: ART-Fi's CORE TECHNOLOGY

Measurement of human exposure to electromagnetic fields has entered a new era.

ART-Fi has developped a near-field scanning technology. The aim of ART-Fi is to fully characterize without any approximation, the electromagnetic fields emitted by connected devices. This rigorous and complete characterization requires to measure the Amplitude, and the Phase. The Phase of the electromagnetic field is essential especially for high precision measurement. The Phase allows that the total field can be retrieved using solely physics’ laws without any approximations.

This disruptive near-field technology also allows real-time and precise measurement of antenna radiations, while all the other historical technologies are approximative by being phaseless. Phaseless technology makes impossible to use the laws of physics for electromagnetic field computations, and implies techniques with no theoretical basis.

The D-Phase technology has proven its potential to address today and tomorrow's key challenges in antenna radiation measurements and characterization, with an unprecedented accuracy.

D-Phase technology basics

The simple principle, implemented by ART-Fi and allowing a drastic acceleration of measurement speed, is to avoid any mechanical movement of the probes. A fixed array made of several hundreds of probes is embedded into a phantom electronically scanned and combined with a vector spectrum analyzer for direct phase acquisition on radiofrequency signals (time-domain).

D-Phase technology allows for the first time high accuracy measurements in real-time and an exclusive analysis approach for modern communication technologies.

D-Phase for 5G

Why using a RF Vector Receiver for the 5G testing challenges?

A wireless device emits radiations of electromagnetic fields (EMF) absorbed by human tissues. This human exposure leads to human body temperature elevation.

The international scientific community of research on bio-electromagnetics has proven that the electromagnetic properties of the human tissues represent a linear propagation media for the electromagnetic fields. This property translates into a linear dependence of the rate of the human-body temperature, increasing the power of the transmitted EMF. In other words, variation of the body temperature evolves linearly with the SAR level.

Serious studies and extensive publications have showned that the 30 years old historical technology is limited to deliver the required linear measurement of the EMF power and its associated SAR. It is even more true that today's mobile phones embedds advanced modulations and complex radiation modes.

Historical technology is reaching its limits for the 5G forthcoming 5G challenges: the SAR measurement underestimation resulting from the aforementioned non-linearities - with the RF signal waveform complexity and modulation scheme - is becoming severely significant. As a consequence it puts the public health at risk.

Innovative accurate SAR testing solutions using RF vector probe technology (D-Phase) seamlessly addresses the above-mentioned linearity issues and enables accurate SAR measurements of the new-radio and 5G connected devices.

D-Phase technology allows the measurement of:
- time-averaged power of the EMF
- specific absorption rate (SAR)

Those measurements are produced through a modulated RF signals vector spectrum analysis. For the same network frequency, it allows to measure the SAR difference between various modulation technologies and bandwidths.

For 5G mobile phones, the recent publication of the IEC 62609-3 standard recognizes the ART-Fi technology as the most reliable measurement solution for SAR compliance testing and certification.