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CC2640: Antenna tuning on double sided flex?

Tom Cannon20
Prodigy 30 points

Part Number: CC2640

Hello,

Anyone working on antenna tuning?

Not using normal PCB

Design guide for mounting; IC, antenna and tuning on double sided copper kapton flex, 50-micron thickness.

  • 0
    TI__Mastermind 36415 points
    Tom,

    The influence of the PCB material becomes less and less as the PCB gets thinner, until the PCB is longer there. At 50um, the PCB has little to no effect on the antenna.

    I would recommend that you start with one of our most flexible antenna designs,

    www.ti.com/.../swru120c.pdf

    and then look at our antenna selection guide for how to test and tune it once you have it built.

    www.ti.com/.../swra161b.pdf

    we also have online trainings available.

    training.ti.com/importance-antenna-design-optimized-range-performance

    training.ti.com/rf-basics-getting-started

    Regards,
    /TA
  • 0 in reply to TA12012
    Prodigy 30 points
    Thank you for the info,

    I see in the training design the PCB thickness to ground plane is factored.
    Is this correct or does this not refer to the board ground but is the distance to true earth ground for the device?
    I am planing on using a chip mount antenna with a balun, due to size constants, the back side copper of the flex is the ground plane.
    (Johanson 2450AT42E0100 antenna over ground & 2450BM14G0011 balun network)

    Thanks,

    Tom
  • 0 in reply to Tom Cannon20
    TI__Mastermind 36415 points
    Tom,

    If you have the antenna implemented as a PCB antenna on the top surface, and there is no copper on any other layers below (as required by the design). Then as the overall PCB thickness becomes lower, the impact becomes less. Yes, it does have an effect, but you are talking about 50um of material, its mostly a theoretical influence and not something to be worried about.

    With thin PCB's you get the opportunity to place it close to something, like the human skin etc. Here the issue becomes bigger and bigger as you make the PCB thinner.

    To perform formal simulations on this I would recommend Ansys HFSS full 3D finite element solver.

    Regards,
    /TA