Field as a driver for a passive circuit and antennae

[NotoriousNick]

Rfid: wondering what some more of the details are of this technology.

Put a field as a driver for a passive circuit and antennae emmitting some digital code at a frequncy, and some other receiver tuned to receive this and process..

Anyone know some more specifics?

 

[dlgoff]

http://en.wikipedia.org/wiki/Radio-frequency_identification"

 

[NotoriousNick]

Pretty informative, but I'm wondering how the mechanism of an EM wave triggers some IC with stored information - to drive a signal in an antennae with that info.. More of a wireless digital signal transmission question

Tx

 

[dlgoff]

At a basic level, each tag works in the same way:

* Data* stored within an RFID tag's microchip waits to be read.
* The tag's antenna receives electromagnetic energy from an RFID reader's antenna.
* Using power from its internal battery or power harvested from the reader's electromagnetic field, the tag sends radio waves back to the reader.
* *The reader picks up the tag's radio waves and interprets the frequencies as meaningful data.

http://electronics.howstuffworks.com/gadgets/high-tech-gadgets/rfid2.htm"