[Noisebridge-discuss] RFID

Tue Jul 16 02:56:14 UTC 2013

On Jul 15, 2013, at 7:46 PM, Henner Zeller <h.zeller at acm.org> wrote:

> Don't they need to be connected to the fairly large coil ? Usually,
> the coil goes over the full area of the RFID card.

Yes, coil geometry is absolutely critical for read distance. The entire chip is being powered by the coil.

Some RFID systems, such as EZPass, put batteries in the tags so that they don’t need such high field strength to operate.

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