Microwave tube transformer-window

Claim 1

IN A MICROWAVE TUBE HAVING AN INTERIOR RECTANGULAR WAVEGUIDING PORTION TUBE PROPAGATING ELECTROMAGNETIC WAVES IN THE TE10 MODE AND MAINTAINED AT A PRESSURE LESS THAN ATMOSPHERIC PRESSURE, AND A CONTIGUOUS EXTERIOR RECTANGULAR WAVEEGUIDING PORTION FOR PROPAGATING ELECTROMAGNETIC WAVES IN THE TE10 MODE AND MAINTAINED AT A PRESSURE GREATER THAN THAT OF SAID INTERIOR WAVEGUIDING PORTION, WITH THE DIMENSIONS OF SAID INTERIOR AND EXTERIOR WAVEGUIDING PORTIONS ASSOCIATED WITH THE MAGNETIC FIELD OF SAID ELECTROMAGNETIC WAVES BEING EQUAL AND THE DIMENSION OF SAID EXTERIOR WAVEGUIDING PORTION ASSOCIATED WITH THE ELECTRIC FIELD OF SAID ELECTROMAGNETIC WAVES BEING GREATER THAN THE DIMENSION OF SAID INTERIOR WAVEGUIDING PORTION ASSOCIATED WITH SAID ELECTRIC FIELD; A MICROWAVEPERMEABLE WINDOW DISPOSED SOLELY IN SAID EXTERIOR WAVEGUIDING PORTION ADJACENT ITS END NEARES SAID INTERIOR WAVEGUIDING PORTION, SAID WINDOW COMPRISING: AN ELEMENT OF DIELECTRIC WITH MATERIAL DISPOSED IN SAID EXTERIOR WAVEGUIDING PORTION WITH ITS END NEAREST SAID INTERIOR WAVEGUIDING PORTION LOCATION A PRESELECTED DISTANCE FROM THE END OF SAID INTERIOR WAVEGUIDING PORTION, SAID DIELECRIC ELEMENT DEFINING AT LEAST TWO PORTIONS OF EQUAL EXTENT IN THE MAGNETIC FIELD DIRECTION AND OF RESPECTIVELY DECREASING EXTENT IN THE ELECTRIC FIELD DIRECTION AS A FUNCTION OF DISTANCE FROM SAID END OF SAID INTERIOR WAVEGUIDING PROTION, THE EXTENT OF SAID DIELECTRIC ELEMENT IN SAID MAGNETIC FIELD DIRECTION BEING DIELECTRIC ELEMENT IN SAID MAGNETIC FIELD WAVEGUIDING PORTION, THE EXTENT OF THE PORTION OF SAID ELEMENT NEAREST SAID INTERIOR WAVEGUIDING PORTION IN SAID ELECTRIC FIELD DIRECTION BEING SUBSTANTIALLY EQUAL TO THE EXTENT OF SAID EXTERIOR WAVEGUIDING PORTION IN SAID ELECTRIC FIELD DIRECTION, THE EXTENT OF EACH PORTION OF SAID DIELECTRIC ELEMENT ALONG THE LENGTH OF SAID EXTERIOR WAVEGUIDING PORTION BEING EQUAL TO ONE-QUARTER WAVELENGTH FOR PRESELEECTED ELECTROMAGNETIC WAVES IN THE RESPECTIVE PORTIONS OF SAID DIELECTRIC ELEMENT, AND SAID PORTION OF SAID DIELECTRIC ELEMENT NEAREST SAID INTERIOR WAVEGUIDING PORTION BEING SEALED TO SAID EXTERIOR WAVEGUIDING PORTION.