Re: RF schottky
You probably have a reflection coefficient that is almost 1 in magnitude. You can think of that as a small resistance (say 2 ohms) in series with a small capacitance (say 0.2 pF), or as a large resistance (say 2000 ohms) in parallel with a small capacitance. But, since the reflection coeeficient is almost unity, you can not build a matching network for that.
But if you drive the diode with enough RF power so that it starts rectifying, then you get a better guess at the diode's impedance to match to. This is the "large signal" impedance you want to design the matching network for.
By the way, one common "matching" technique if you do not care about efficiency, is to place a DC blocked 50 ohm resistor in parallel with the schottky diode. You have a broadband low reflection coefficient detector now--albeit not a very efficient one.