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12.4mm Round RFID tag 28445 — Parallax Forums

12.4mm Round RFID tag 28445

clshclsh Posts: 2
edited 2014-12-14 20:26 in General Discussion
Hi,

I am looking at this particular RFID tag for my project.
http://www.parallax.com/product/28445

Anyone knows the polarization of this tag?

Please advise.
Thanks in advance!


Regards,
clsh

Comments

  • Mike GreenMike Green Posts: 23,101
    edited 2014-12-14 19:10
    Why would polarization be an issue? The antenna is a simple loop antenna. When it's in proximity to an RFID reader, the tag's loop antenna acts as a secondary winding to the transformer whose primary is the RFID reader's antenna. The tag's antenna has to be within a few inches of the reader's antenna so energy can be adequately transferred to power the tag's chip.
  • clshclsh Posts: 2
    edited 2014-12-14 19:47
    Mike Green wrote: »
    Why would polarization be an issue? The antenna is a simple loop antenna. When it's in proximity to an RFID reader, the tag's loop antenna acts as a secondary winding to the transformer whose primary is the RFID reader's antenna. The tag's antenna has to be within a few inches of the reader's antenna so energy can be adequately transferred to power the tag's chip.

    i was thinking of "orientating" the tag to the RFID reader.
    If someone is to mess with my device(with embedded RFID tag ), even as close proximity, it will not trigger any response from the reader.
  • Duane DegnDuane Degn Posts: 10,588
    edited 2014-12-14 20:26
    clsh wrote: »
    i was thinking of "orientating" the tag to the RFID reader.
    If someone is to mess with my device(with embedded RFID tag ), even as close proximity, it will not trigger any response from the reader.

    I'm having a hard time understanding what you mean by the above. Do you mean you don't want your RFID tag to trigger a response or do you mean it hasn't triggered a response in the past?

    I think it's a safe bet the coils inside the tag are very similar to this tag's coils only smaller.
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