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What is this adhesive patch chip

Can somebody tell me what this is. It had a white backing on it that I peeled off

owen1989

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shabaz over 7 years ago +4

Hi David, It's a tag, used in retail stores to identify theft. Basically there is a resonant circuit consisting of that spiral, and a small capacitor (the center part of that tag). When someone walks out…
balearicdynamics over 7 years ago in reply to shabaz +3

It is similar to an RFID Tag but you can see that there is not the small chip instead present in the RFID tags. In this case if you place thin Aluminium foild around the tag it is masked by the detector…
gadget.iom over 7 years ago +3

As already stated by shabaz and balearicdynamics , they are security tags frequently used in retail. Some further information about the operational principles of these RF Tags (and other technologies)…

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shabaz over 7 years ago

Hi David,

It's a tag, used in retail stores to identify theft. Basically there is a resonant circuit consisting of that spiral, and a small capacitor (the center part of that tag).
When someone walks out of the retail store with that tag attached, it gets sensed by equipment near the door (a radio transmitter and a receiver circuit).
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Jan Cumps over 4 years ago in reply to shabaz

shabaz wrote:

Hi David,

.... (a radio transmitter and a receiver circuit).
nuance: It's a transmitter that gets its stable state disturbed by the resonant circuit when it moves in range. There's no receiver that gets a reply.
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shabaz over 4 years ago in reply to Jan Cumps

Hi Jan,

There may (guessing) be many variants, there is a (dumb tag) type which is on both side of entryways which uses a receiver circuit here:
https://www.edaboard.com/threads/antennas-for-8-2-mhz-tag-detection.358819/
Possibly some manufacturers keep it vague for security through obscurity perhaps, so I'm not sure.
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shabaz over 4 years ago in reply to Jan Cumps

Hi Jan,

There may (guessing) be many variants, there is a (dumb tag) type which is on both side of entryways which uses a receiver circuit here:
https://www.edaboard.com/threads/antennas-for-8-2-mhz-tag-detection.358819/
Possibly some manufacturers keep it vague for security through obscurity perhaps, so I'm not sure.
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