[ale] Radio-frequency identification (RFID) chips

[zeb]

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....
>
> -MM
>
> _______________________________________________
> Ale mailing list
> Ale at ale.org
> http://www.ale.org/mailman/listinfo/ale