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Using nRF51822-CFAC + BAL-NRF02D3 with flex PCB (FPC) trace antenna?

Brian

Hi,

I'm designing a four layer flex PCB with the nRF51822-CFAC and recommended ST BAL-NRF02D3 balun and PCB trace antenna (not chip). I have a couple of questions.

  • Can I use the recommended design files (nRF51822 webpage --> "downloads" --> "reference layout") and guidelines here to tune the antenna still? Do you suspect that the design files are close enough? Has anyone designed a flex PCB with these parts yet?
  • Should I add one or two shunt components to the antenna for better tuning, since my design is further off of the recommended stackup?

Thank you for your time, Brian

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    Hi Brian,

    You can(and should) definitely use the reference layout as well as the general PCB design guidelines. Remember to add a matching network between your balun and the antenna. With a flex PCB you will probably see some weird effects, but you will have a functional circuit as long as you stick to the reference layout, and do your tuning well.

    You should be fine using only one shunt component since you are using a PCB antenna you will be able to do a lot of your tuning by cutting the antenna to size. The idea is to cut the antenna until you reach G=1 circle then add a shunt capacitor to pull it in towards 50ohm.

    Best regards,

    Øyvind

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  • 0

    Hi Brian,

    You can(and should) definitely use the reference layout as well as the general PCB design guidelines. Remember to add a matching network between your balun and the antenna. With a flex PCB you will probably see some weird effects, but you will have a functional circuit as long as you stick to the reference layout, and do your tuning well.

    You should be fine using only one shunt component since you are using a PCB antenna you will be able to do a lot of your tuning by cutting the antenna to size. The idea is to cut the antenna until you reach G=1 circle then add a shunt capacitor to pull it in towards 50ohm.

    Best regards,

    Øyvind

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