On 10 May 2005 10:15:02 -0700, "K7ITM" wrote:

Or get even further back to basics and MAKE a directional coupler.
It's not all that difficult, and not bad to check for directionality.
RFSim99 has a tool for designing microstrip and other couplers (though
it fails to tell you that for the given coupling, the microstrip lines
should be coupled for a quarter wave distance). Hint: people who
manufacture equipment that operates in the GHz region often put
couplers right on the PC boards--biggest cost is a bit of real estate.

Or rip one out of a defunct cell phone.


Wes