I'm involved with a project that is using these neat bluetooth modules from sparkfun. However, right now there are two problems with our design. The first is that its using a little too much power. The second is that we actually only want the bluetooth to transmit in a smaller range and a smaller scale of directions(i.e. be directional).
The hackish but seemingly obvious way to fix the directional problem would be to put the device in a not perfect faraday cage (I believe they call them cantennas) which directs the waves. We could also probably weaken the signal in this manner. So that solves 2/3 problems.
The last problem is about saving power. Would it be feasible to design an antenna for this system (probably an etched one?) that could meet my directional/smaller range requirements and save power?
Any ideas welcome.