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[ale] Radio-frequency identification (RFID) chips
For what it may be worth: there is an article on RFID in the current
issue of "Scientific American."
On Wednesday 07 January 2004 07:20 pm, Michael Mealling wrote:
> On Wed, 2004-01-07 at 13:54, Mike Murphy wrote:
> > question: what's the typical range at which one can get data out
> > of an RFID chip?
> Given the following assumptions:
> 1) nothing between the chip and the reader
> 2) a good, expensive antenna
> 3) the chip is not moving
> 4) and the chip is a high quality design (good power, good antenna)
> (this usually means the entire tag is about 6-8 inches square)
> Then you can usually get a greater than 90% read rate around 25
> feet. Think of the size of a typical dock door and you get the idea
> of the intended ranges.
> The readers that I've been playing with cost about $5,000 and can
> read even poor quality tags within about 1-2 feet reliably.
> The reader I describe above with teh 20 foot range costs around
> $50,000 I think....
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