  A conversion matrix approach to solving network problems involving
time-varying circuit components is applied to the method of moments for
electromagnetic scattering analysis. Detailed formulations of this technique's
application to the scattering analysis of structures loaded with time-varying
circuit networks or constructed from general time-varying media are presented.
The computational cost of the method is discussed, along with an analysis of
compression techniques capable of significantly reducing computational cost for
partially loaded systems. Several numerical examples demonstrate the
capabilities of the technique along with its validation against conventional
methods of modeling time-varying electromagnetic systems, such as finite
difference time domain and transient circuit co-simulation.
