field as a driver for a passive circuit and antennae


by NotoriousNick
Tags: antennae, circuit, driver, field, passive
NotoriousNick
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#1
Nov26-09, 09:13 AM
P: 32
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?
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dlgoff
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#2
Nov26-09, 09:46 AM
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http://en.wikipedia.org/wiki/Radio-f...identification
NotoriousNick
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#3
Nov26-09, 11:12 AM
P: 32
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
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Nov26-09, 02:28 PM
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field as a driver for a passive circuit and antennae


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...gets/rfid2.htm


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