On 21/08/2019 16:58, harry wrote:
On Wednesday, 21 August 2019 14:16:34 UTC+1, Andy Burns wrote:
dennis@home wrote:

Someone really should tell them that the normal RFID tags in use are not
powered by radio waves

Except they *are* they get parasitic power from the device that is
scanning them ...

I thought it was a magnetic coupling

Correct, a RF field has both electric and magnetic components.