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PSaho
PSaho
Associate II
August 30, 2019
Solved

Please suggest some readily available small antenna (SMD ferrite, etc) for ST25DV-I2C

  • August 30, 2019
  • 1 reply
  • 902 views

..

    This topic has been closed for replies.
    Best answer by Henry Crane

    hello,

    please find here attached a former application note discussion about the use of smd coil as antenna for RFID and NFC. This document refers to product that as been replaced by M24LRXXE-R and more recent ST25DV family but is still relevant because the tuning capacitance and RFID protocol is the same.

    you'll find at https://www.st.com/en/evaluation-tools/ant3-m24lr04e.html a demo board based on M24LR04E-R using such SMD coil as antenna. its bill of material gives an example of coil from the market (https://www.st.com/resource/en/bill_of_materials/ant3-m24lr04e_bom.pdf) All smd inductors not shielded, with same inductance value will fit.

    best regards,

    NFC/RFID tags /dynamic tags support team

    1 reply

    Henry Crane
    Henry CraneBest answer
    ST Employee
    September 9, 2019

    hello,

    please find here attached a former application note discussion about the use of smd coil as antenna for RFID and NFC. This document refers to product that as been replaced by M24LRXXE-R and more recent ST25DV family but is still relevant because the tuning capacitance and RFID protocol is the same.

    you'll find at https://www.st.com/en/evaluation-tools/ant3-m24lr04e.html a demo board based on M24LR04E-R using such SMD coil as antenna. its bill of material gives an example of coil from the market (https://www.st.com/resource/en/bill_of_materials/ant3-m24lr04e_bom.pdf) All smd inductors not shielded, with same inductance value will fit.

    best regards,

    NFC/RFID tags /dynamic tags support team

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