Hi buoli,
I have attached the circuit schematic and the prototypes i built, one with BNC and the other one with SMA.
For the dc measurements i connect the power supplies VGG and VDD. I have bypassed both these power supplies well with surface mount capacitors. I vary VDD and measure the drain voltage with a multimeter to calculate the IDS. The drain current rises normally to some point and then drops suddenly. If probed by the spectrum analyser the peaks at 5 Ghz, 10 Ghz, 15 gHz are observed, when this current drops.
For prototype board i make islands for every net int he schematics. Please see the arrows to know which island corresponds to which net. Let me know if youhave any more questions for me to help.