Photoconductive modulation of microwave electric fields

Thin films and coatings of photoconductive cadmium sulfide material are being used to modulate electric fields. This paper analyzes these films in terms of the physics involved and the effect upon microwave fields. Experimental procedures show the validity of the analyses and indicate possible applications of the principle. Practical significance of the technique is illustrated by experimentally determining the areas of a particular flat plate that produce the first sidelobe of the scattering pattern.