How to render the 2.4GHz antenna directional

antennabidirectionalbluetooth low energy

With barely no knowledge in this field, I would like to render my antenna used with Bluetooth BLE devices more directional.

I tried to shield the antenna with different kind of metals with no luck.

Is there someone to point a way in order to render my antenna directional? Perhaps surounding with something?


Best Answer

Since the wavelengthn is quite short (~10 cm) it's very important that the reflector (that can be a can, as proposed) is placed carefully, in a way that the reflected signal is as much as possible in phase with the directed. You achieve this by having the reflecting surfaces at a distance that is multiple to half a wavelength.

You can try to tune it by measuring the signal strength while varying the reflector position, but I wouldn't expect great improvements unless you use a specifically made antenna.