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Antenne requirements nRF52840 - Antenna tuning

bubble23

Hi,

I have a question about the whitepaper nwp-017.pdf. It is described under the chapter "Equipment needed to tune an antenna" that you have to attach a coax cable where you want to measure the impedance. So to tune the antenna I have to measure behind the matching network? Or can I measure in front of the matching network with the embedding and de-embedding method (including the matching-Network)?

What is the impedance at the output of the nrF52840 chip? We need the information for research and test.

thanks in advance

Parents
  • +1

    Hi,

    What is the impedance at the output of the nrF52840 chip?

    The RF impedance is 50 Ohm, se ref pic from nrf52840 CKAA schematic.



    For tuning of the antenna the coaxial cable is attached before the matching network, se picture. 

    The wording may change depending on what perspective you have, if you are looking form the antenna side or from the radio side. Hope the illustrations above clarifies.

     Regards,
    Jonathan

Reply
  • +1

    Hi,

    What is the impedance at the output of the nrF52840 chip?

    The RF impedance is 50 Ohm, se ref pic from nrf52840 CKAA schematic.



    For tuning of the antenna the coaxial cable is attached before the matching network, se picture. 

    The wording may change depending on what perspective you have, if you are looking form the antenna side or from the radio side. Hope the illustrations above clarifies.

     Regards,
    Jonathan

Children
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