Waveguide window structure having three resonant sections giving broadband transmission with means to fluid cool center section

Claim 1

A WAVEGUIDE WINDOW STRUCTURE COMPRISING A SECTION OF CIRCULAR WAVEGUIDE, A PAIR OF THIN, SPACED-APART, PLANAR DIELECTRIC DISCS SEALED ABOUT THEIR PERIPHERIES IN A VACUUM-TIGHT MANNER TO THE INTERIOR SURFACE OF SAID CIRCULAR WAVEGUIDE AT ITS CENTRAL REGION INTERMEDIATE ITS TWO ENDS, SAID DIELECTRIC DISCS BEING PERVIOUS TO ELECTROMAGNETIC WAVE ENERGY BUT BEING IMPERVIOUS TO AIR AND GASES, FIRST AND SECOND CONICAL RECTANGULAR-TO-CIRCULAR WAVEGUIDE TRANSITION SECTIONS RESPECTIVELY COUPLED TO THE OPPOSITE ENDS OF SAID CIRCULAR WAVEGUIDE, SAID TRANSITION SECTIONS HAVING LENGTHS NO GREATER THAN ONE WAVELENGTH OF THE ELECTROMAGNETIC WAVES PROPAGATING THERETHROUGH TO PROVIDE AT A RESPECTIVE TRANSVERSE REFERENCE PLANE BETWEEN THE ENDS OF EACH TRANSITION SECTION A RESPECTIVE REFLECTIVE DISCONTINUITY, THE ELECTRICAL SEPARATION BETWEEN THE OUTER FACES OF SAID TWO DISCS BEING SUBSTANTIALLY EQUAL TO (2N-1)$ RADIANS FOR ELECTROMAGNETIC WAVES AT A FREQUENCY IN A BAND OF FREQUENCIES, THE ELECTRICAL SEPARATION BETWEEN EACH OF SAID DISCS AND THE TRANSVERSE REFERENCE PLANE THROUGH THE ADJACENT TRANSITION SECTION BEING APPROXIMATELY EQUAL TO (2N-1)$ RADIANS FOR ELECTROMAGNETIC WAVES WITHIN SAID BAND OF FREQUENCIES, WHEREBY THE COMBINATION OF SAID TWO SPACED-APART DIELECTRIC DISCS, THE CIRCULAR WAVEGUIDE SECTIONS AND TRANSITION SECTIONS ON EACH SIDE THEREOF COMPRISE A TRIPLE-RESONATOR FILTER.