My vote..

Passive means to modify the field, this includes harmonic
content.

Active means use the field to generate new frequencies, as
though a battery were attached.  

                      - Robert -

       Robert A. Macy, PE .. [email protected]
       408 286 3985 . . . .. . . fx 408 297 9121
       AJM International Electronics Consultants
       101 E San Fernando, Suite 402
       San Jose, CA  95112



On Thu, 20 Nov 2003 14:38:05 -0500
 [email protected] wrote:
> 
> I have heard the term "passive" used 2 ways, as indicated
> below or as a
> device that actually transponds an independent code from
> that which it
> received from the interrogator, powered off the
> interrogator's field.  Thus
> in the latter it is a function of with or without a
> battery, with = active,
> without = passive.  What is the consensus of the Forum
> for "passive"
> regarding RFID tags?
> 
> Don Umbdenstock
> Sensormatic 
> 


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