Electron tube apparatus having slanted output window between offset waveguides

Claim 1

A HIGH FREQUENCY ELECTRON TUBE APPARATUS INCLUDING MEANS FOR FORMING AND PROJECTING A BEAM OF ELECTRONS OVER AN ELONGATED BEAM PATH; MEANS ARRANGED ALONG THE BEAM PATH OF ELECTROMAGNETIC INTERACTION WITH THE BEAM; MEANS FOR ABSTRACTING HIGH FREQUENCY WAVE ENERGY FROM THE BEAM FOR PROPAGATION TO A SUITABLE LOAD; SAID ABSTRACTING MEANS INCLUDING A GASTIGHT WAVE PERMEABLE WINDOW ASSEMBLY INCLUDING, A FIRST SECTION OF HOLLOW WAVEGUIDE HAVING A FIRST AXIAL CENTER LINE, A SECOND SECTION OF HOLLOW WAVEGUIDE HAVING A SECOND AXIAL CENTER LINE, A THIRD SECTION OF HOLLOW WAVEGUIDE JOINING TOGETHER SAID FIRST AND SECOND SECTIONS TO GUIDE AND FORMING A TRANSITION SECTION BETWEEN SAID FIRST AND SECOND GUIDES WITH THE FIRST AND SECOND CENTER LINES DIUSPLACED FROM EACH OTHER IN THE DIRECTION OF THE ELECTRIC FIELD LINES, A PLATELIKE WAVE PERMEABLE GASTIGHT WINDOW MEMBER SEALED ACROSS SAID THIRD TRANSITION SECTION OF GUIDE, SAID PLATELIOKE WINDOW MEMBER BEING INCLINED IN SAID TRANSITION GUIDE WITH THE PLANE OF SAID PLATELIKE WINDOW BEING DISPOSED AT A SUBSTANTIAL ANGLE TO THE AXIAL CENTER LINES OF SAID FIRST AND SECOND GUIDES, AND SAID TRANSITION SECTION OF GUIDE HAVING A HEIGHT TAKEN IN THE DIRECTION OF THE ELECTRIC FIELD VECTOR IN SAID GUIDE WHICH IS GREATER THAN THE HEIGHT OF SAID ADJOINING FIRST AND SECOND SECTIONS OF GUIDE WHEREBY SAID WINDOW ASSEMBLY IS RENDERED SUBSTANTIALLY REFLECTIONLESS OVER A BROAD BAND OF FREQUENCIES.