Cavity termination for microwave oscillators

Claim 1

A MICROWAVE OSCILLATOR FOR DEVELOPING ELECTRICAL SIGNALS OF SELECTED FREQUENCIES, SAID OSCILLATOR COMPRISING, IN COMBINATION: (A) A TUBULAR OUTER CONDUCTOR; (B) A COAXIAL INNER CONDUCTOR; (C) A VACUUM TUBE MOUNTED COAXIALLY WITHIN ONE END OF SAID OUTER CONDUCTOR, SAID TUBE HAVING (1) A CATHODE ELECTRODE ELECTRICALLY CONNECTED SAID OUTER CONDUCTOR, (2) AN ANODE ELECTRODE ELECTRICALLY CONNECTED TO SAID INNER CONDUCTOR AND RECEIVING D.C. ENERGIZATION THROUGH SAID INNER CONDUCTOR, AND (3) A GRID ELECTRODE; (D) A GRID MEMBER DISPOSED COAXIALLY BETWEEN SAID INNER AND OUTER CONDUCTORS, SAID GRID MEMBER (1) BEING ELECTRICALLY CONNECTED TO SAID GRID ELECTRODE, (2) COOPERATING WITH SAID INNER CONDUCTOR TO DEFINE A GRID-PLATE CAVITY, (3) COOPERATING WITH SAID OUTER CONDUCTOR TO DEFINE A GRID-CATHODE CAVITY, AND (4) HAVING A FREE END BEYOND WHICH SAID INNER AND OUTER CONDUCTORS COOPERATE TO DEFINE A PLATECATHODE CAVITY, (E) MEANS TERMINATINGA SAID PLATE-CATHODE CAVITY, SAID TERMINATING MEANS INCLUDING (1) AN ELECTRICALLY CONDUCTING SLEEVE DISPOSED COAXIALLY ABOUT AN INNER CONDUCTOR AND IN CAPACITIVELY COUPLED RELATIONSHIP THERETO, AND (2) A RADIAL FLANGE FIXEDLY MOUNTED WITHIN THE OTHER END OF SAID OUTER CONDUCTOR, SAID FLANGE (A) BEING LOCATED ADJACENT THE END OF SAID SLEEVE REMOTE FROM SAID TUBE AND PHYSICALLY CONTACTING BOTH SAID SLEEVE AND SAID OUTER CONDUCTOR TO PHYSICALLY TERMINATE SAID PLATE CATHODE CAVITY, AND SEAL OFF THE INTERIOR OF AND OUTER CONDUCTOR FROM THE EXTERNAL ENVIRONMENT, (B) ELECTRICALLY CONTACTING SAID SLEEVE AND SAID OUTER CONDUCTOR TO ELECTRICALLY TERMINATE SAID PLATE-CATHODE CAVITY, AND (C) COOPERATING WITH SAID SLEEVE AND SAID INNER CONDUCTOR TO PROVIDE A LOW IMPEDANCE, OPEN ENDED COAXIAL TRANSMISSION LINE OPERATING IN THE QUARTER WAVE LENGTH MODE SO AS TO SUBSTANTIALLY PREVENT LEAKAGE OF RADIO FREQUENCY ENERGY FROM SAID PLATE-CATHODE CAVIITY PAST THE ELECTRICAL TERMINATION THEREOF, (3) THE LOCATION NEAREST SAID TUBE OF THE PHYSICAL AND ELECTRICAL CONTACT BETWEEN SAID TERMINATING MEANS AND SAID OUTER CONDUCTOR BEING RADIALLY ALIGNED WITH THE RADIAL SURFACE OF SAID FLANGE NEAREST SAID TUBE; AND (F) A TUNING SCREW ADJUSTABLY PROJECTING THROUGH SAID OUTER CONDUCTOR INTO SAID PLATE-CATHODE CAVITY RADIALLY TOWARD SAID SLEEVE FOR ADJUSTING THE SELECTED SIGNAL FREQUENCY DEVELOPED BY SAID OSCILLATOR.