Rectangular to ridged waveguide transition having separate mode converting and impedance matching sections

Claim 1

A TRANSITION FOR COUPLING A RECTANGULAR WAVEGUIDE TO A RIDGED WAVEGUIDE COMPRISING FIRST AND SECOND SECTIONS COUPLED TOGETHER; SAID FIRST SECTION COMPRISING A HOLLOW RECTANGULAR WAVEGUIDE PORTION, THE HEIGHT OF SAID PORTION PROGRESSIVELY DECREASING IN A DIRECTION ALONG THE LENGTH OF SAID FIRST SECTION FROM ONE END TO THE OTHER END THEREOF, THE INTERNAL CROSS SECTION OF SAID FIRST SECTION AT SAID ONE END THEREOF BEING THE SAME AS THE INTERNAL CROSS SECTION OF SAID RECTANGULAR WAVEGUIDE; SAID SECOND SECTION COMPRISING A HOLLOW OUTER MEMBER AND A RIDGED MEMBER DISPOSED WITHIN SAID OUTER MEMBER, SAID OUTER MEMBER DECREASING IN INTERNAL WIDTH AND INCREASING IN INTERNAL HEIGHT IN A DIRECTION ALONG THE LENGTH OF SAID SECOND SECTION FROM ONE END TO THE OTHER END THEREOF, SAID RIDGED MEMBER DECREASING IN WIDTH AND INCREASING IN HEIGHT IN SAID DIRECTION ALONG THE LENGTH OF SAID SECOND SECTION, THE INTERNAL CROSS SECTION OF SAID SECOND SECTION AT SAID OTHER END THEREOF BEING THE SAME AS THE INTERNAL CROSS SECTION OF SAID RIDGED WAVEGUIDE; AND SAID ONE END OF SAID SECOND SECTION BEING JOINED TO SAID OTHER END OF SAID FIRST SECTION.