Applying the mechanics of the propagation of high power microwave in atmosphere and the theory of plasma physics, a sort of new conception antenna-active lens antenna based on plasma is put forward.

You get the most light output from this projector when the lamp power is set to high, and the zoom lens is set to maximum wide angle (shortest throw distance for any given image size).

In that case, Fourier transform system with long focal length and high power lens and method of linear decision are proposed.