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MRD2EVM: Read ranges with various capsules

Mark kim
Prodigy 40 points
Part Number: MRD2EVM
Other Parts Discussed in Thread: RI-STU-MRD2,

Hello, 

I was just wondering what the read ranges between the various capsules and the RI-STU-MRD2 RFID reader module are.

Thank you,

Mark

  • 0
    TI__Guru*** 134845 points
    Hello Mark,

    The read ranges vary based on the tags used and the orientation of the tags. We don't have any data for this for the MRD2EVM as it's an application specific topic.
  • 0 in reply to Ralph Jacobi
    Prodigy 40 points

    Thanks for the reply Ralph, 

    Is there maybe a average read distance for the 12mm encapsulated tag you guys have, if is laid flat on a table and the tag reader parallel to that encapsulated tag? The application I am trying to work with needs a read distance of up to 10 cm, I just wanted to get somewhat of a ballpark before I purchase the eval kit.

    Thanks,

    Mark

  • 0 in reply to Mark kim
    TI__Guru*** 134845 points

    Hi Mark,

    I have submitted an inquiry with the LF RFID product team to see if they have any typical read range numbers for that combo.

  • 0 in reply to Ralph Jacobi
    TI__Guru*** 134845 points
    Hello Mark,

    Here is the response I received in full:

    "If the transponder is flat on the table and the reader is parallel to the transponder it is not the best orientation from the transponder to the reader antenna.
    In this orientation at the center of the antenna you will get around 4cm, above the antenna windings you will get around 5cm.
    If the transponder is in the ideal orientation to the reader antenna you will get around 7.5cm."
  • 0 in reply to Ralph Jacobi
    Prodigy 40 points

    Ralph,

    I have one more annoying question could I use the RI-RFM-007b module inline with the RI-STU-MRD2, to extend the reading distance further?

    Thanks,

    Mark

  • 0 in reply to Mark kim
    TI__Guru*** 134845 points
    Hello Mark,

    It's true that something like the RI-RFM-007B would get you more read range, but that is on Lifetime Buy so not really an option.

    What you could do is change the antenna on the MRD2EVM to something larger. The transponder is capable of longer ranges depending out reader output power and antenna size. So if you connect a larger antenna to the micro-reader you can achieve 10cm with the 12mm transponder in the ideal orientation.

    A test has been done with an antenna around 6cm * 12cm and with the orientation of the transponder being parallel to the antenna it will be difficult to achieve the 10cm with the micro-reader, but in ideal orientation the 10cm range was reached.
  • 0 in reply to Ralph Jacobi
    Prodigy 40 points

    Ralph,

    Makes perfect sense I will try different antennas that we will design into PCB boards. Thanks for all your help!

    Thanks,

    Mark