Disclosed is a switch mode power amplifier that provides high power (e.g.,
100 W) at a high frequency (e.g., microwave frequency range). The switch
mode power amplifier includes a load resistor, an inductor-capacitor (LC)
circuit connected in parallel with the load resistor, a first switching
mechanism connected to a first endpoint of the load resistor, and a
second switching mechanism connected to a second endpoint of the load
resistor. In one embodiment, the LC circuit is a first LC circuit
connected in parallel with the load resistor and a second LC circuit is
connected in series with the first LC circuit (and therefore connected in
parallel with the load resistor). The circuit is transformer free.