Re: impedance measurement
Of course, in order to perform a measurement, some instruments are needed.
Otherwise you cannot know the impedance of your circuit with a computer simulation because the circuit contain variable components (variable capacitors).
If you are interested to the reflection coefficient module only and if you have a generator look at the following solutions:
You may use, for example, an SWR meter, a popular and cheaper instrument used by amateur radio, the most populr is the "Bird" and may be found on the surplus market.
Another way is the use of a directional coupler, a diode detector and a voltmeter. MiniCircuits sell cheaper couplers.