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CC2651R3SIPA: Internal Antennae Layout Questions

Paul Seifert
Prodigy 180 points
Part Number: CC2651R3SIPA

Tool/software:

Hi,

I have a couple of layout questions for the CC2651R3SIPA:

First, I am trying to evaluate whether we would be able to use the internal antennae on the CC2651R3SIPA module given a particular board constraint. The board is shaped in a roughly 1.25" circle. Because of this, the 10mm ground plane (G) would get cut off by the edge of the board. See image below for example. The green is the ground plane. Dark Grey is the board. Light Grey is the module. Does this shape violate the recommended design layout? Would this layout put us at risk of voiding the radio certifications?

Second, it is unclear to me how far the 10mm ground plane requirement extends along the module. Does it stop at the 3.2 mm (D) dimension? or does it extend the full length of the module? See image above.

Third, does the 10 mm dimension (G) ground plane need to be clear of components and signal / power traces on all board layers?

Fourth, for the alternate module layout guidelines, the dimension F is listed at 12.98 mm. Is this correct? The dimension G is still listed at 10 mm which means the math does not add up. 

Thanks,

Paul

  • +1
    TI__Expert 4900 points

    Hi Paul,

    1. Yes it would violate the recommended layout and certification. Unfortunately, these type of antennas are very sensitive to changes to ground planes defined by G

    • One solution is to move the module closer to the center, but the trade-off is less routing space as the top edge cannot have a ground plane.

    2. It must extend to a minimum of 3.2mm. Of course, more is better.

    3. Yes, otherwise it will alter antenna performance because ground plane is etched away

    4. F and A should be the same on both layouts. The only difference should be B. I will request a correction.

    Best regards,

    Bun