Wide-band coupling systems between a waveguide and a transmission line

The paper describes a wide-band microwave system suitable for coupling power between a coaxial line and a waveguide or between two waveguides. Such a system can be applied to normal matched transmission as well as, for example, to coupling power between a coaxial klystron cavity and a waveguide. An appreciable improvement in performance over other schemes results in an almost constant power transfer over a bandwidth in the region of 25%. A practical example of the system in X-band is described.