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Original question:

LAUNCHXL-CC1310: Correct dimension.

LAUNCHXL-CC1310: Antenna Size of Rev 1.4 for Rev B

Matheus Babieri
Prodigy 30 points
Part Number: LAUNCHXL-CC1310
Other Parts Discussed in Thread: CC1310

Tool/software:

To whom it may concern,
I have a question about antenna size of Launchpad.
I had CC1310 Launchpad Rev 1.4, and CC1312 HW Rev:D, and i Saw the antenna of new launch pads of cc1310 is the same size of CC1312 Launchpad, I understanding for cut cost and had the same platform. 
But I want know is: which the impact of transmition and rssi signal? For the this different sizes. I don't know if the texas had a documentation about the signal after antenna change.

Thanks,

  • 0
    TI__Mastermind 18045 points

    Hi,

    Speaking more generally as this also applies to changes on customer boards, the impacts would mainly be:

    • The change in the size of the antenna's ground plane affects the required antenna matching (meaning the antenna matching network needs to be adjusted). This is because the antenna's resonant frequency is shifted.
    • The size and shape of the ground plane affects the antenna's radiation pattern.

    Details are given in:

    The LaunchPads are for evaluation purposes, so customer designs will likely not have the same ground plane size and so some differences in performance are to be expected (and accounted for where possible); this is a physical limitation, not something that TI can prevent apart from advising on how to get the best performance on customer designs.

    For the CC1310 LaunchPads specifically, moving to the latest design has the following benefits:

    • The larger ground plane slightly improves performance.
    • The header pins were moved further away from the antenna. This improved the antenna performance (especially moving the power headers) and it is not recommended to place any headers around the antenna in future designs.

    So, the latest revision would have better performance, but the actual antenna design, apart from the ground plane size, is the same so for customer designs it has no impact due to the customer boards having a different ground plane size (as discussed above)..

    Regards,

    Zack

  • 0 in reply to ZC
    Prodigy 30 points

    Dear Zack, 

    Thank you very much for the awnser.