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RFID reader with external antenna

Denis GALLICO
Prodigy 30 points
Other Parts Discussed in Thread: TRF7960, TRF7970A

Dear everyone,

I was looking for an RFID HF 14443 reader and I found your TRF7970AT and it looks great but I need a larger antenna.

You have an UFL connector on the board so maybe I can plug a larger antenna. What would be the larger antenna able to be connected.(have enough power because we don't want a dead zone in the middle)

Moreover, I would be interested in any HF 14443 reader you can have. So if I missed one , I would be happy to get his datasheet.

 

Best Regards,

 

  • 0
    TI__Guru* 91206 points

    Denis - 

    the TRF7960, -60A, -63A, -64A and -70A are all ISO14443A reader/writer ICs. 

    Regarding your question about the external and possibly larger antenna, to connect one to the -ATB, you need to remove C23 and then connect to the U.FL, as you have already guessed. To connect one to the -AEVM, you need to remove R3, install a through hole or edge mount SMA connector and then connect your antenna. In both cases the antenna connected should be 50 ohms impedance @ 13.56MHz and be a Q value of ~8 for ISO14443A reading.

    The question back is what size tag antenna and which tag silicon would you be using. or you can just point to an assembled device for helping figure out the approximate range you will see.

    for example, if you have a look at section 12 (page 19) of the TRF7970ATB user manual, http://www.ti.com/lit/ug/slou372/slou372.pdf, I did put in some observed read ranges with three different protocols and multiple sized tags, to give you an idea of what i am looking for in order to be able to assist you correctly.   

  • 0 in reply to Josh Wyatt
    Prodigy 30 points

    Thank you very much Josh for this fast and complete answer!

    If I well understand, I can use an SMA connector just removing R3. 

    When I asked for a larger antenna (connected on the sma connector), in fact, I want a large read zone but not particularly a far one. I'm trying to read wristband bracelets and I would prefer to scan this bracelet in a 200x200mm area than targeting a 50x50mm one.

    Maybe you know the maximal size your module can support and maybe you also know and good antenna who fits to these requirements.

    Best Regards,

  • 0 in reply to Denis GALLICO
    TI__Guru* 91206 points

    Any of these from Feig would most likely do it for you. 

    Digi-Key Part Number Manufacturer Part Number Manufacturer Description
    629-1025-ND 1663.000.00 FEIG Electronic ID ISC.ANT340/240 PAD ANT
    629-1039-ND 1968.000.00 FEIG Electronic ID ISC.ANT100/100-A ANT 50 OHM
    629-1056-ND 2717.000.00 FEIG Electronic ID ISC.ANT200/200 HAND HELD HF
    629-1007-ND 1451.000.00 FEIG Electronic ID ISC.ANT300/300 ANTENNA

    the first one is the only one i see in stock - the last one would be the largest i would connect up for what you described.

    other vendor might be DLP Design, too - and you can contact them for a "variety pack" of PCB antennas i know they make but are not on their website. make sure you ask for normal sma, not the reverse one. 

    http://www.dlpdesign.com/contact.shtml

    regarding the TRF7960AEVM or the TRF7970AEVM and R3, yes, that is correct, just remove R3 to disconnect onboard antenna and install SMA or connect coax from 50 ohm (at 13.56MHz antenna) to center conductor hole and GND to GND. 

  • 0 in reply to Josh Wyatt
    Prodigy 30 points

    Josh,

    1. Is the reader compatible with Windows, Mac OS, and Linux platforms?

    2. Does the reader come with any diagnostic / utility software (Windows) so we can test the reader?

    3. What work is involved in adding the Lantronix XPort Pro to the TRF7970A?

    Best Regards,

  • 0 in reply to Denis GALLICO
    TI__Guru* 91206 points

    i think folks have used the TRF7970AEVM in Linux and Mac...not 100% on that (at least on the Mac side)

    the NFCLink solution is able to work with Windows XP, 7 and 8, Linux (Ubuntu) and Android. We have not checked it in Mac, although i imagine it would work running in a compatibility mode.

    Both version of the EVMs have GUIs for your testing.  

    the Lantronix device looks pretty cool - thanks for showing that -  it looks like a fairly resource rich device. I would imagine we could load the available OS stack on there, its a new configuration idea on me, but i think its doable.  

  • 0
    Prodigy 50 points
    maybe you can modify the rfid reader into such a rfid reader antenna.
    i found this fixed hf rfid reader with four antenna interface.
    maybe you could refer it.
    syncotek.com/.../srrh_9003_long_distance_hf_tag_reader.html