A large number of simulation methods are supported in Microwave Office including:

• Linear simulation: linear simulation is used for circuits created from only linear elements (elements whose response is not a function of the magnitude of the voltage across them).  Common linear analyses are:
  
  • AC analysis which produces a transfer function of output voltage vs. input voltage
  • S-parameter analysis which produces a response of output power vs. input power
• Nonlinear simulation: nonlinear simulation is used for circuits containing nonlinear elements such as diodes and transistors and include:
  
  • Transient (spice) analysis is a method which computes a DC solution for the circuit and then simulates the circuit as time advances computing the current (and voltages) of each node in the circuit at each point in time.
  • Steady-state (harmonic balance) analysis is a method that computes the steady-state response of a nonlinear circuit.

All of these methods are available in MWO depending on what stimulus you add to your circuit and what measurements you add to your graphs.  You can search for the simulation method in the examples to see how to setup simulations for each method.