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How to connect a 3D coil antenna

Roberto Yokomizo
Prodigy 20 points

Hello all,

 

I am design a NFC tag application and I need your help to connect a NFC coil antenna.

In my application the communication it is done in Z axis only and the communication distance is very important.

And in the application report SLOA217 page 10 and 11 suggest a 3D antena (three single coil oriented in the 3 space axis), but it is not clear how to connect the coil to the RF430FRL NFC sensor.

In my case I must connect only one coil or it is necessary to connect the three coils?

Thanks for your help.

Roberto

 

 

 

Best regards,

Roberto Yokomizo

Kron Instrumentos Eletricos Ltda

Brazil

  • 0
    TI__Expert 7820 points

    If your communication is limited to only one axis then you only need one coil or even one PCB antenna.

    Please refer to section 5.3 (SLOA217) on how to connect an external antenna or a single axis coil.  They both have two connectors with a parallel tuning capacitor that will be needed.

    Let us know if there is anything unclear.

  • 0
    TI__Mastermind 29065 points
    Hey Roberto,

    If the tag and reader orientation are always going to be the same (like in a fixed system or a ID badge context), then 1 coil will work great. A 3 coil solution would give you the best performance if you have a random orientation.

    It sounds like 1 coil would work fine for you.

    I'm not actually sure how someone would use/connect a 3 coil antenna on the tag side, so I'll let Josh or Eddie comment on that.

    Thanks,
    JD
  • 0 in reply to JD Crutchfield
    TI__Mastermind 43290 points

    As the others have stated, 1 axis antenna will be good for your application. 

    The antenna coils used in the application note have 3 axis, but only one axis is connected.  For the RF430xx devices and all other transponder devices that I am aware of, they only accomodate one axis.  For a reader device, a mux could be used to connect all 3 coils.  This type of configuration makes more sense for a reader/writer system.

  • 0 in reply to Eddie LaCost
    Prodigy 20 points
    Hi Eddie,

    Thank you to all for clarifying my doubt.
    I became interested in the 3D coil antenna because it has a larger area compared to the other coils. Maybe that improves communication distance.

    Best regards,
    Roberto