Directivity is almost always non uniform. I’ve only day bled in antenna design. But I believe the proper response would be!: Define "directional
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Isn’t one of the best ways to extend bluetooth range less about embiggening the antenna, but getting it farther away from fleshy stuff like your squishy hands?
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the further I place my fleshy bits away, the weaker the signal becomes…
I think my wiener may be adding to the antenna gain…<
I rely about 90% on multi-path…
Are these shielded nrf51?
Common PCB antennas are patch antennas or bent monopole antennas. I’m not sure which one the Metr Pro has. Next time I open my enclosure I will check.
All antennas are directional to some extent. The amount of directivity is the primary driver in the antenna gain. Gain is directivity minus antenna losses. An antenna that radiated power equally in all directions is called isotropic and doesn’t really exist other than in theory. If you measured the power radiated at a fixed radius around an antenna the ratio of the surface area of the entire sphere to the area of the sphere that is radiated is the directivity. In the picture if you imagine it in 3D the area of the red sphere that the blue dotted cone hits is the directivity. The smaller that area the bigger the antenna gain.
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