Multicavity optical couplers

Multicavity optical couplers are electron beam interacting structures consisting of an array of cavities properly spaced so that the output r-f apertures form a phased array antenna. When the cavities are spaced a beam wavelength apart, then the r-f excited by a bunched beam passing through the cavities is in proper phase so that the r-f apertures act as a linear phased array of dipoles launching a fan shaped beam as 90° relative to the electron beam axis.