Mode Stirred Chamber Measurement of GHz Emissions of Wireless Power Transfer Systems

(EN) This paper shows measurements of emissions
from a wireless power transmission system (WPT) into the
GHz region measured in a mode-stirred reverberation
chamber. It estimates the disturbance potential of these signals
relative to the needed signal strengths of wireless
communication systems, such as GPS. It is explained how to
measure pulsed signals in a mode stirred chamber by using
triggered spectral analysis and averaging by mechanical mode
stirring. Based on this measurement and analysis it is possible
to estimate the loss in the signal budget due to this interference
for wireless data such as Bluetooth, GPS, or Wi-Fi. The
primary objective is to use this example to illustrate that these
low clock frequency, fast switching GaN devices can disturb
wireless services and how to quantify the radiation and
disturbance potential using a mode stirred chamber. GaN, Si,
and SiC implementations are compared.