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Problems creating an PCB track NFC antenna

Fred27

I'm trying to create a PCB track NFC antenna as an Eagle part. As part of this I need a via so I can bring out the connection from the centre of the coil. Is it possible in a library part?

 

Also, the antenna involves a trace which appears to "short" two nets, so I get an overlap DRC error. Is it possible to avoid this?

 

I took a look at Sparkfun's RFID evaluation shield to see if that gave me any clues. They apparently went for the antenna as part of the design rather than a library part (avoiding the via issue) but still appear to have similar overlap errors.

https://www.sparkfun.com/products/10406

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    Hey David,

     

    it is much simpler if you do the antenna in the board and not in the library, as you can do a design without the mentioned DRC errors.

     

    It basically just:

    1. Short the pins out in schematics.

    image

     

    2. Draw the  antenna wires as suggested in the design note of the NFC IC.

    image

     

    A few tips when working with NFC:
    In order for the antenna to work properly you'll need to individually match to your antenna, and in most cases you won't get away with the matching from another design.
    So make sure, to have a least two footprints (0805, 0603 or 0402) for each matching component, this will allow you to solder capacitors in parallel what allows you to to trial and error test matching easier.

     

    Greets

    Berni

Reply
  • 0

    Hey David,

     

    it is much simpler if you do the antenna in the board and not in the library, as you can do a design without the mentioned DRC errors.

     

    It basically just:

    1. Short the pins out in schematics.

    image

     

    2. Draw the  antenna wires as suggested in the design note of the NFC IC.

    image

     

    A few tips when working with NFC:
    In order for the antenna to work properly you'll need to individually match to your antenna, and in most cases you won't get away with the matching from another design.
    So make sure, to have a least two footprints (0805, 0603 or 0402) for each matching component, this will allow you to solder capacitors in parallel what allows you to to trial and error test matching easier.

     

    Greets

    Berni

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