Does wireless charging have an impact on health?

The key consideration for wireless RF charging is safety. For devices emitting this type of radiation, strict regulations must be adhered to worldwide. The so-called Part 15 regulations set by the US FCC limit the power to 4W effective isotropic radiated power (EIRP), with a maximum conducted power of 1W for transmitted power. Due to the stringent restrictions, Energous aims to collaborate with Part 18 regulations covering the ISM band.

Energous' CEO Stephen Rizzone said.

The focus is on the power absorbed by humans, the specific absorption rate, and SAR. The limit for 1 meter is 1.6W/kg. The kg in SAR measurement is related to the material that absorbs energy, which for humans is their skin. Rizzone stated that the FCC agreed to accept a power limit equivalent to transmission within the wavelength range, or approximately 0.3m.

The Federal Communications Commission (FCC) uses [wavelength] as a reference distance for energy roll-off around the receiver, with a maximum distance of 1 meter from the transmitter to the receiver. Cesar Johnston stated that currently, the FCC is approving wireless power transmission up to a maximum distance of 1 meter under Part 18.

Wireless RF charging is also closely related to the use of RF to collect energy. The biggest difference lies in the fact that RF charging employs a specific frequency to ensure charging, while the receiver can only focus on this frequency. Harvesting typically involves clearing environmental signals to obtain any information that can be collected from them. This may require the use of a wider-band receiver to access more frequencies, which will reduce efficiency. Energous deliberately makes the RF charging method active, while energy harvesting is passive.

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