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@azonenberg @dlharmon @g4dbn
Friend has simulated some stuff relating to that and it seems to simulate up to 20-30GHz with 0.086 semirigid at least.
The thing apparently is to get the launch really good.
So cutting a slot to the PCB for the coax and soldering it to the grounds was apparently critical for good return loss.
Our discussions and his simulations were mostly from the point of feeding LO to homebrew harmonic mixers.
Because I wanted to push 18GHz or preferably 38GHz to a 76GHz rig.