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Long Distance LF RFID

Abdallah Mardawi
Prodigy 35 points
Other Parts Discussed in Thread: MRD2EVM

Hello

Recently I purchased teh MRD2EVM for the evaluation of the LF RFID.

Unfortunately, the evaluation card is detecting the samples on short distance.

In my application, I need a system that can read transponders on a distance of 1m, and penetrate concrete wall or the ground (No metal).

Is changing the antenna would help is boosting the reading range?

If not, what is the recommended system for my application?

The 32mm glass capsule transponders are supposed to have 110 cm range, can they be still readable throw concrete?

Regards;

Abdallah

  • 0
    TI__Guru* 91086 points

    Abdallah - 

    the recommended starter system for you (for that distance and ease of use) would be the RI-STU-S251B + the RI-ANT-G01E...but you would need to move up to 30mm disk transponder, as with this combo and the 32mm glass, you would still be about 15cm short on max range possible, moving to the -G04E size would put you pretty close to the 1m readout distance with the 32mm (you would be somewhere between 90 and 95cm with that combo)  - but the G04E has been EoL'ed...so you could then make your own coil. 

    http://www.ti.com/product/ri-stu-251b 

    let us know if you need further help /assistance on getting where you want to be here. 

  • 0 in reply to Josh Wyatt
    Prodigy 35 points

    Dear Josh,

    Thank you so much for your prompt answer.

    As per my understanding, the RI-STU-S251B with the proper antenna will give a better charging signal for the transponder, and will have a higher reading range of the signal from the transponder.

    The question now, will the system mentioned above have a better reading range if used with the 120mm tube transponders?

    Since the 120mm tube transponders had been discontinued, we will have to make our own.

    I will need some guidelines for the design of antennas and transponders.

    Regards;

    Abdallah

  • 0 in reply to Abdallah Mardawi
    TI__Guru* 91086 points

    Abdallah - 

    Pls. find the presentation attached helpful to your question - along with extra data regarding range with the various antennas and the S251B

    4784.Metric LF Read Ranges_Antennas_Voltages.pdf

    reagarding making your own transponders? what are you planning on using for silicon? could you use SIP package? regarding antenna design for transponder - we would need to know your plans so we can help you directly. 

    further - on reader antenna - if S251B is OK for you - then you just need 27uH antenna coil with a high Q.

    6330.LF Antenna Design.pdf

    You could also use then perhaps the RI-RFM-007B + RI-CTL-MB2B combo as well. It depends on if you need the extra features the S251B offers or not. Same antennas can be used here, too.

     

  • 0 in reply to Josh Wyatt
    Prodigy 35 points

    Dear Josh

    Thank you so much for the presentations you have sent, they clarified some points.

    Regarding making our own transponders, we would prefer if we can find something ready to use.

    As I have mentioned earlier, the 120mm cylinder, or the 85mm disk can be ideal for our application because of their long range, but unfortunately they are discontinued.

    Our application will need a charging and reading of transponders through ground (1 to 1.5 meter depth) or concrete walls.

    are there any alternatives for the discontinued transponders that will serve our need?

    Regards;

    Abdallah

  • 0
    Prodigy 150 points

    I would also like to increase the operating range of the microreader. I have tried larger antennas - a 200mm x 900mm antennas gives me around 600mm read range with a large 70mm diameter tag antenna, but can I increase the range further using similar techniques to those outlined in SCBA031 ?