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2018 News Releases




The IARU watches WPT developments .

Date : 06 / 01 / 2018
Author : Jim Linton - VK3PC

Widespread interest continues in Wireless Power Transfer (WPT) technology, reflecting the considerable concern about its potential to cause radio frequency interference. Studies continue ahead of the World Radiocommunications Conference 2019 with its Agenda item 9.1.6 - Wireless Power Transmission (WPT) for electric vehicles.

WPT applications are expanding to mobile and portable devices, home appliances and office equipment. The automotive industry looks to it for electric vehicle applications in the near future. Power levels range from milliwatts to hundreds of kilowatts and typical transmission ranges are up about 30 centimetres.

Radio users are concerned that while the intended distance can be small, it is inevitable that some energy will be coupled into other conductors acting as unintended antennas. This may cause harmful interference to incumbent services through the radiation of harmonics. WPT is recognised as having potential advantages but must develop in such a way that prevents harmful interference to incumbent services in the frequency band or bands to be considered. Protection of incumbent in-band radiocommunication services as well as adjacent and harmonically related bands from spurious and out-of-band emissions must also be ensured.


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