Strip line to ridged waveguide transition having a probe projecting into waveguide through ridge

Claim 1

A WAVEGUIDE-TRANSMISSION LINE TRANSITION COMPRISING, IN COMBINATION, A WAVEGUIDE HAVING A RECTANGULAR CROSS SECTION, A CONDUCTING PLATE TERMINATING A FIRST END OF SAID WAVEGUIDE WITH A LOW IMPEDANCE, A RIDGE OF CONDUCTING MATERIAL PROTRUDING FROM A FIRST WIDE WALL OF SAID WAVEGUIDE AND EXTENDING ALONG SAID WALL FROM SAID PLATE, A TRANSMISSION LINE HAVING AN OUTER CONDUCTOR SYSTEM AND AN INNER CONDUCTOR IN WHICH SAID OUTER CONDUCTOR SYSTEM COMPRISES TWO GROUND PLANE OUTER CONDUCTORS AND IN WHICH SAID INNER CONDUCTOR IS DISPOSED EQUI-DISTANTLY BETWEEN SAID GROUND PLANE OUTER CONDUCTORS, SAID LINE PROTRUDING THROUGH SAID PLATE AND BEING RECESSED WITHIN SAID RIDGE AND IN LINE THEREWITH, A STUD-TYPE PROBE CONNECTED TO SAID INNER CONDUCTOR AND PROJECTING FROM SAID RIDGE PERPENDICULAR TO SAID FIRST WALL, MEANS INSULATING SAID PROBE FROM SAID RIDGE, SAID PLATE BEING SO LOCATED WITH RESPECT TO SAID PROBE AS TO PRESENT A HIGH IMPEDANCE AT SAID PROBE AT THE OPERATING FREQUENCY OF SAID TRANSITION, SAID RIDGE PROVIDING AN INCREASE IN WAVEGUIDE CUTOFF WAVELENGTH WHILE INCREASING THE FREQUENCY RANGE OVER WHICH ONLY A DOMINANT MODE WILL PROPAGATE IN SAID WAVEGUIDE.