Thanks a lot Higgler for your tip.
I will try this solution too.
I've planned to experiment all the solutions this week but I've to posticipate them for a job trip.
Anyway, after that I will try all the solutions I will report their results, in order to be useful for those that need to do this one.
Dear Biff44 and VE1BLL, I've appreciate very much your post because now the problem is more clear for me.
Summarizing, the problem isn't the aluminum foil but the USB cable that works as an antenna.
Then there are three possible solutions given by Biff44:
1) 4 lowpass filters, each returning to...
Hi Higgler, thanks for your answer.
I tried the alluminium foil but its effect is limited because it does not work as a Faraday cage as it is floating and it is not connected to ground.
In other words, paradoxically, the foil re-transmits the signal emitted by the antenna embedded into the dongle.
Good morning to everyone.
For my test I need to strongly reduce the range of a bluetooth dongle (It is the classic USB bluetooth dongle working at 2.45GHz).
I read online that all attempts to shield the bluetooth dongle (e.g by wrapping it with aluminum foil) fail because the screen is floating...
