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MERSI
Graduate II
March 6, 2025
Solved

ST25R3916B – Antenna Multiplexing Solutions

  • March 6, 2025
  • 1 reply
  • 694 views

Hi everyone,

I am working with the X-NUCLEO-NFC08A1, which uses the ST25R3916B chip, and I am planning to use it's main IC (ST25R3916B ) with 6 antennas. The idea is to use the two RF interfaces of the chip, with each interface connected to 3 antennas.

I would like to know if anyone has experience or recommendations on how to handle antenna multiplexing for this setup. Specifically, I’m wondering whether it would be better to implement the multiplexing using PIN diode circuits or if it would be more suitable to use an RF switch. Are there any other solutions or approaches that should be considered? Do you have any specific IC (related) recommendations?

Additionally, I’d appreciate some insights on where the multiplexing circuitry should be located. Should it be positioned between the IC and the antenna circuit (IC-xx-AntennaCircuit-Antenna) or between the antenna circuit and the antennas themselves (IC-AntennaCircuit-xx-Antenna)?

Looking forward to your advice!

Best regards,

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

    HI Mersi, 

     

    ST has just released an Application note which should fit your need. 

    Please have a look at https://www.st.com/content/st_com/en/search.html#q=an6121-t=resources-page=1

    In case of questions, please let us know.

     

    br Travis

    1 reply

    U
    Ulysses HERNIOSUS
    Technical Moderator
    March 6, 2025

    Hi MERSI,

    some has been discussed in this thread: https://community.st.com/t5/st25-nfc-rfid-tags-and-readers/what-is-the-best-way-to-multiplex-antennas-with-one-reader-ic/m-p/96255

    BR, Ulysses

      M
      MERSIAuthor
      Graduate II
      March 6, 2025

      Thank you @Ulysses HERNIOSUS .

      I've read this thread, but i am not sure if i understand the positioning part correctly. 

      Also I am thinking about how to realise the multiplexing. Using relays is too expensive. So i thought about using PIN Diodes or some RF multiplexer. Maybe someone can recommend any (low price) specific solution they tried? 

      T
      Travis PalmerAnswer
      ST Employee
      October 15, 2025

      HI Mersi, 

       

      ST has just released an Application note which should fit your need. 

      Please have a look at https://www.st.com/content/st_com/en/search.html#q=an6121-t=resources-page=1

      In case of questions, please let us know.

       

      br Travis

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