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[Series 2000] Low Frequency RFID Readers (134.2 kHz), antenna design.

MRR
Prodigy 105 points

Dear sirs,

We have some old low frequency readers from Texas Instruments, specifically the Low Frequency Evaluation Kit:

https://www.ti.com/lit/ug/scbu039/scbu039.pdf?ts=1627379294577&ref_url=https%253A%252F%252Fwww.google.com%252F

However, it seems this kit is obsolete. The main problem for us is that I cannot find any substitute. Im working with inductive coupling antenna design. I have the following questions:

1- Is there any substitute device with similar features? Especially we need the capacity of designing big RFID inductive coupling antennas (134.2 kHz), e.g., loops of 1 x 1 m^2. I have not found so far any possibility. 

2- Is there any documentation for connecting several low frequency antennas (in this case 27 uH) to the same reader and establish an switched control? E.g, I am thinking of creating an antenna array and apply a switching technique. I found some documentation from TI but nothing about connecting more than two loops to the same reader.

I wonder why TI stop manufacturing these devices.

Looking forward to your answers.

Best regards,

-M

  • +1
    TI__Mastermind 18265 points

    Hi,

    TI stopped selling these readers because TI is focused on selling semiconductors. I can point you to the following address which is selling a substitute for the S2000 Readers:

    https://oregonrfid.eu/RFID-Reader-Modules

    For the multiplexing of antennas the RI-MOD-TX8A was available but is also obsolete for a long time.

    mux8a_reference_guide.pdf

    For the antenna design a found the following document:

    8562.11-06-21-068_LF Antenna Design.pdf

    Hope that helps a bit solving your problem.

    Best Regards,

    Helfried

  • 0 in reply to Helfried Vollbrecht
    Prodigy 105 points

    Dear Helfried,

    Thank you very much for your fast answer. I already knew about the pointed documents and the mentioned company (but did not know the link, so it will be very useful for me). I will take a close look to the multiplexer documentation too.

    I have two last questions I would like to ask:

    - It seems there are several 134.2 kHz transponders are still active, e.g., www.ti.com/.../RI-TRP-DR2B. When I worked with the series 2000 readers I recall just one tag can be within the reading range, so there exist the possibility that no tag is detected. There is a dependence between the orientation and the reading range and that is what I would like to avoid. Are there compatible tags with several coils (antennas) embedded so that this orietation dependence is avoided or at least decreased? I thought about programming the tags with the same ID and orient them in perpendicular axes but the problem still happens (no tag is detected if they are equally oriented and to a similar distance with respect to the antenna reader). Any workaround/idea about this is appreciated.

    - I would like to simulate the generated magnetic field by the antenna, any hint in this aspect is appreciated (so far thinking about working with Matlab and Ansys)

    Best regards,

    -M

  • 0 in reply to MRR
    TI__Mastermind 18265 points

    Hi M,

    is your goal to detect multiple transponders in the field or just one transponder regardless of the orientation? 3-D antennas are used in key fobs for cars but these are complete different systems. The use LF as downlink and UHF as uplink to achieve distances of a few meters.

    For the simulation of the generated magnetic field of the antenna I have nothing available.

    Best Regards,

    Helfried

  • 0 in reply to Helfried Vollbrecht
    Prodigy 105 points

    Hi Helfried,

    Thank you. My goal is to detect just one transponder within the reading range at a relatively constant distance, regardless the orientation. Even if there are several transponders within the reading range it would be ok to detect just one.

    Since there is a dependence with the orientation (page 3 point 2 in https://www.ti.com/lit/ml/slyt536/slyt536.pdf?ts=1627423428899) the first solution I thought was to have several 32 mm transponders perpendicularly oriented, but  I have tested that there can be situations where no tag is read (I think due to transponders emit their signal with less than 3 dB of difference and the reader has no anti-collision algorithms, I actually read that but I cannot find the TI document).

    Thus, I thought about looking for a tag with antenna coils embedded in different directions to avoid the orientation dependence (I thought about an orthogonal reference where the axis X-Y-Z would be e.g. 32 mm transponders), but I could not find it. In addition, I'm using LF because the antenna/s are installed in metal environments.

    Best regards,

    -MRR

  • 0 in reply to MRR
    TI__Mastermind 18265 points

    Hi,

    I understand the problem your are facing but it looks like I can not help with this request because we can not provide a solution for your problem.

    Best Regards,

    Helfried

  • 0 in reply to Helfried Vollbrecht
    Prodigy 105 points

    Ok, in any case thank you for you attention, your previous message and pointed documentation actually will help.

    Best regards,

    -MRR