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DPing
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February 1, 2019
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How can I design an NFC Antenna with custom geometry?

  • February 1, 2019
  • 1 reply
  • 796 views

I have to design an NFC Antenna that has to stay on PCB whic shape is a circular sector.

I'm thinking to design an antenna that follows the profile of the PCB.

Is that a good idea? Do you have any other suggestions?

Thanks

This topic has been closed for replies.
Best answer by Travis Palmer

​Hello,

putting the antenna traces on the same PCB as the ST25R391x reader IC is possible. You can use the ST25R3911B-DISCO board as an example. The metal inside the Antenna will change your antenna parameter. This is quite difficult to calculate. For an rough estimation you can use the eDesignSuite - It will not be able to consider GND planes in the center of the antenna. https://my.st.com/analogsimulator/html/#/home

You should also have a look at the AN4974: "Antenna matching for ST25R3911B/ST25R391x devices" appnote.

br Travis

1 reply

Travis Palmer
Travis PalmerBest answer
ST Employee
February 4, 2019

​Hello,

putting the antenna traces on the same PCB as the ST25R391x reader IC is possible. You can use the ST25R3911B-DISCO board as an example. The metal inside the Antenna will change your antenna parameter. This is quite difficult to calculate. For an rough estimation you can use the eDesignSuite - It will not be able to consider GND planes in the center of the antenna. https://my.st.com/analogsimulator/html/#/home

You should also have a look at the AN4974: "Antenna matching for ST25R3911B/ST25R391x devices" appnote.

br Travis

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