Apologies for what may be a basic question, I am unfamiliar with RF systems but much more familiar with optics. I need to connect some standard coax to some microcoax; they do not have exactly matching impedances so there are reflections. It seems to me I should be able to make an 'anti-reflection coating' out of some coax with a different impedance. How do I go about doing this, in particular what components are available and where can I buy the components? Obviously the frequency is important which brings me to my next question. How difficult is it to obtain a 2 GHz source? I only need +/- a few volts, is it a 'voltage controlled oscillator' that I'm looking for?