What is the purpose of the hole on the BL54L15 module, and can it be used for mechanical mounting?

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Answer

The hole on the BL54L15 module is used during manufacturing as part of the routing process when separating the modules from the production panel. It is not intended as a mechanical mounting or retention feature.

 If additional mechanical retention is required, please keep the following in mind:

  • Any material placed in or around that hole should be non-metallic
  • The material should have a dielectric constant close to air (≈1.0)
  • Avoid introducing structures in the antenna keep-out region, as this can impact RF performance

Because the hole is located within the antenna keep-out area, using it for fastening (even with plastic hardware) should be approached with caution due to the potential effect on antenna performance.