On 21/08/2019 20:53, Fredxx wrote:
On 21/08/2019 16:58, harry wrote:
On Wednesday, 21 August 2019 14:16:34 UTC+1, Andy BurnsÂ* 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.


Google 'near field far field'


--
"When a true genius appears in the world, you may know him by this sign,
that the dunces are all in confederacy against him."

Jonathan Swift.