USB-based
device chargers can create noise that interferes with touchscreen operation especially when the chargers omit noise suppression features. So with the advent of wireless charging, one wonders whether noise will be added to the communication channels used by Wi-Fi or Bluetooth devices.
It appears that such corded charging creates noise in the 100 kHz to 1 MHz range, and should therefore not cause problems with Wi-Fi or Bluetooth devices.
But what about wireless charging? Granted, charging systems work by creating localized magnetic fields, which should not, in principle,
interfere with radio frequency signals. But three major approaches to wireless charging (radio charging, inductive charging and resonance charging) do use radio frequencies.
Radio charging, intended to reach low-power devices operating within a 10-meter (30 feet) radius from the transmitter, is seen as a way to recharge batteries in medical implants, hearing aids, watches and entertainment devices.
The transmit…
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