The concept of our microwave-beaming propulsion is very similar to repetitive-pulse laser beaming propulsion:

1) A parabola reflector focuses the microwave beam and causes breakdown of atmospheric air in the vicinity of the focal point.
2) The induced plasma absorbs the microwave energy and expands outwards while generating a shock wave.
3) The nozzle reflects the shock wave and the vehicle gains impulsive thrust.

Microwave pulses are repetitively injected and the cycle is repeated.