You can probably find references like this (not cheap):
https://www.amazon.com/Nonlinear-Microwave-RF-Circuits-2nd/dp/1580534848
In general most RF/microwave is presumed linear. And when it's not it's device-level transistor/diode models exactly like you'd have at low frequencies. E.g. s-parameters and other 2-port parameters are 100% linear only.
Most of an undergrad EE is about "How to keep it linear" where "it" is literally everything.
You do run into nonlinear concerned but often they are handled by things like Class C amplifiers (which are merely filtered to eliminate the introduced nonlinear effects), or "load-pull" testing which look at mismatch effects caused by nonlinearity in the gain cell.