Re: how far are RFID tags scanning distance?

On Wed, 23 Nov 2005 08:07:23 -0700, Jim Thompson <To-Email-Use-The-Envelope-Icon@xxxxxxxxxxxxxxx>
wrote:

>On Wed, 23 Nov 2005 15:58:19 +0100, Sander <Big_Scary_Man@xxxxxxxxxxx>
>wrote:
>
>>Nick wrote:
>>
>>>
>>> The scanning distance we need would be around 3 meters. Do you guys
>>> have any suggestion about the tags, and tag readers?
>>
>>Depending on circumstances 3 meters might be feasible with passive UHF
>>tags. A lot depends on your exact application and requirements though.

You'd need a BIG antenna on the tag, and/or a LOT of transmit power though.. possibly enough to
raise health concerns if users were exposed continuously to it.
.

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