I don't know what do you mean by "as a topic", but I can just give you some hints from the literature. Mixers with active elements can be devided in two, transconductance (bias as active device, has gain) and resistive ones (basically working as a diode mixers but have better linearity). I understand that you want to build a transconductance one. For that solution you usally connect LO and RF on the gate of transistor and extract IF from the drain
The story in short will be:
Bias gate near pinch off, have enough LO power to swing the gate voltage near 0V (but not to drive gate in direct regime)
Short cicruit the drain on all LO harmonics (F output filter)
Short circuit gate on IF frequencies (usually a shunt stub)
There is an ultimate guide for designing mixers in two books by Steve Maas available in electronic form on the web from MCU - The RF and Microwave Circuit Design Cookbook and Microwave Mixers.
flyhigh