1
\$\begingroup\$

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?

Thanks

\$\endgroup\$
  • 2
    \$\begingroup\$ yeah, just cut a tin can open and unfold it, and make it like a 'radar dish' pointing in the direction you want. That would only increase receive strength, and only if the receiver can handle multi-path/signal reflections. i think, dont sue me if i'm wrong \$\endgroup\$ – KyranF Oct 24 '14 at 12:05
  • \$\begingroup\$ You'd do better not to disasemble the can. See the old writeups on pringles and 2.4GHz wifi. \$\endgroup\$ – Chris Stratton Oct 24 '14 at 13:05
1
\$\begingroup\$

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.

\$\endgroup\$
  • \$\begingroup\$ Thank you for your useful comment. I bought this antenna because of its directional characteristic. But, after some tests, it is absolutely not the case... I will try your suggestions. \$\endgroup\$ – sdespont Oct 24 '14 at 19:46
  • \$\begingroup\$ Well, don't expect a directional antenna to be laser-like. It's much more complicated, and you'll have lots of reflections from the surroundings. \$\endgroup\$ – clabacchio Oct 26 '14 at 20:27

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.