RF PCB Track calculation

I am trying to make a rf switch board with one input and two outputs.
Using that input signal can be connected to any one of output depending
upon the control signal.

My Requirement is track's impedance should to be controlled to 50 ohm.
How to do these ?

Since , it is very simple switch circuit, with single switch IC,
I am planning to do it with free softwares. Is it possible to do ?

Is there any sample designs/eval board designs available in internet ?


regards,
palani