On Tue, 1 May 2007 04:16:00 -0400, you wrote:

>Hi,
>
>Hopefully someone on the list can help. I'm looking for an active RFID
>tag that can be run from very low current and is sold as a discrete
>item as opposed to a prepackaged in-plastic-with-battery tag. I'd
>power the tag from solar or an alternate power source where the
>circuit would transmit whenever it has accumulated sufficient power.
>The range doesn't have to be far, 20m or so would be more than
>adequate.



>I'm also looking for a passive RFID tag that has about the same range.
>Antenna size is not a big deal for my intended application.

You will not get 20m from passive RFID without unrealistically huge antennas.

For solar powered active transmitters, check out enocean's products, in particular the STM100
http://www.enocean.com/




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