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[aprssig] RFID antennas

Steve Noskowicz noskosteve at yahoo.com
Tue Jul 15 23:59:17 UTC 2008


I wish I had, direct, first hand knowledge, but...

A friend was working at a tag company who saw a demo, about 3 years back, that was intended to meet a Wal-Mart requirement for tagging all their shipments.  It used a few Watts, IIR 20, and worked over about 30 ft.  The tags were passive and supposed to be "Printable".  Don't know if it was plausible or smoke & mirrors.  As an RF Engineer, it sounded more smoke than plaus.

Don't think uP, think fully custom - at these quantities.


There are ones that do use batteries.
-- 
73, Steve, K9DCI


--- On Tue, 7/15/08, Robert Bruninga <bruninga at usna.edu> wrote:

...
> what is
> the lowest power microprocessor we have readilly available?
> 
> Lets see...exposure limits ... 900 MHz ...30 mW...
> ... 3mw...            need 100 W though!  
> Maybe I'm doing something wrong...



      




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