Radiation from a metallic disc and an array of metallic discs over a circular rod surface waveguide

An approximate expression for the radiation intensity of a disk over a metallic circular rod surface waveguide has been obtained. The radiation intensity pattern of an end-fire array of such disks has been found to provide information regarding the direction of maximum radiation and the beam width of the radiation intensity pattern of the disk over the surface waveguide. The array as a whole has been found to provide an end-fire beam of very narrow width, and it is excellently matched to the surface waveguide.