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TRPGR30ATGC: animal tagging

Veronika Zlatkina
Prodigy 30 points
Part Number: TRPGR30ATGC

Hi. We would like to use TRPGR30ATGC transponder by placing it inside a plastic container and hanging on a small animal's stainless steel collar. I have a few questions. First, will a sub-centimeter proximity to metal still let us read the tag? Then, if the dirt or urine get inside the container with the glass encapsulated tag, will this interfere with the tag's detection? Also, can the tag be read in proximity to regular power supplies/ computer monitors? And finally, if there is a scratch on the glass surrounding the tag, can we still use it? In other words, how bad the damage should be to stop using the tag? Many thanks for your help.

  • 0
    TI__Guru*** 128095 points

    Hello  Veronika,

    Veronika Zlatkina said:
    First, will a sub-centimeter proximity to metal still let us read the tag?

    That depends exactly how close they will be. The metal detunes the antenna and impacts read performance. if you are too close (less than 3mm), it is quite likely based on prior tests with a similar transponder that you would not be able to read the tag. Ultimately, you will need to test that on your end in your system, but stainless steel will be a challenge.

    Veronika Zlatkina said:
    Then, if the dirt or urine get inside the container with the glass encapsulated tag, will this interfere with the tag's detection? Also, can the tag be read in proximity to regular power supplies/ computer monitors?

    None of these should possess a notable issue, though in theory a power supply could generate noise in the frequency ranges used for communication.

    Veronika Zlatkina said:
    And finally, if there is a scratch on the glass surrounding the tag, can we still use it? In other words, how bad the damage should be to stop using the tag?

    A scratch should be okay but if the tag is compromised then there can't be any guarantees. The casing protects the antenna, IC, etc. so as long as the casing is intact, surface damage should have no impact, but if any amount of surface is compromised to the point that outside particles can enter the tag we cannot guarantee performance.

  • 0 in reply to Veronika Zlatkina
    Prodigy 30 points
    We are using a circular antenna/coil with this transponder. Is there a preferred orientation for the transponder? Imagine, that it is positioned in the center of the circle/coil, directly above or below. Should the transponder be aligned with the plane of the circle or be perpendicular to it? Thank you for your help.
  • 0 in reply to Veronika Zlatkina
    TI__Guru*** 128095 points

    Hello Veronika,

    In general you want the antennas to be in parallel as much as possible when you have the ability to do so, but given the geometry of the transponder that can be difficult, and is not required for reading, though it would help with maximum range.

    How you should view the situation is that the antenna will emit RF field in all direction and form a field pattern. Unless there is something impeding it from outputting in a specific directly, you'd get an output like this:

    So what you want is to have the tag antenna within this field pattern. Having it perpendicular will give you maximum range, but being in the pattern in general will lead to positive results. Now keep in mind that is a generalized drawing and the exact pattern and distance varies for each system due to antenna dimensions, RF output power, etc. but hopefully that gives you a good idea to work from.