Regardless of the antenna choice, the size of the ground plane will influence the gain of the antenna, and for a smaller PCB this will usually be the limiting factor.Ī PA/LNA will also give you extended range, as you can set the output power to up to +18dBm, but will also mean higher current consumption: A bigger antenna (monopole) will usually give you better performance, but it will take more space, which for wearables is also something to consider. The datasheet of the BMD840 specifies an antenna gain of max -1dBi, if you are curious you can compare this figure with other antenna manufacturers of any external antenna you are considering using instead. I don't think the type of antenna (if it's internal or external) will have so much to say for the performance in your case.
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