[aprssig] RFID antennas
noskosteve at yahoo.com
Tue Jul 15 18:59:17 CDT 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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