I see the BBC reporters don't understand RFID tags.
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. |
I see the BBC reporters don't understand RFID tags.
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 BurnsĀ* 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. |
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