Harmonic generator

Claim 1

IN A HARMONIC GENERATOR FOR OPERATION WITH AN OSCILLATOR ENERGIZING AN OUTPUT CAVITY WITH A SIGNAL OF A FIRST FREQUENCY, THE COMBINATION COMPRISING (A) A COUPLING PROBE ARRANGED TO PROTRUDE INTO SAID CAVITY, (1) A CYLINDRICAL DISC CONNECTED ON THE END OF SAID PROBE THAT FITS WITHIN SAID CAVITY FOR INCREASING THE CAPACITANCE REACTANCE WITH WHICH SAID PROBE IS COUPLED TO SAID CAVITY, (B) A COAXIAL TRANSMISSION LINE HAVING AN INNER CONDUCTOR CONCENTRICALLY DISPOSED WITHIN AN OUTER CONDUCTOR, (1) SAID INNER CONDUCTOR BEING COUPLED WITH THE END OF SAID PROBE REMOTE FROM SAID CAVITY, AND (2) SAID OUTER CONDUCTOR BEING COUPLED WITH SAID CAVITY, (A) SO THAT SAID OSCILLATOR SIGNAL IS COUPLED FROM SAID CAVITY TO SAID COAXIAL TRANSMISSION LINE, (C) A RECTANGULAR WAVEGUIDE (1) MEANS FORMING AN APERTURE THROUGH A FIRST WALL AND SAID WAVEGUIDE, (2) SAID COAXIAL TRANSMISSION LINE COMMUNICATING WITH SAID WAVEGUIDE AT SAID APERTURE WITH SAID OUTER CONDUCTOR CONNECTED TO SAID FIRST WAVEGUIDE WALL, (D) A VARACTOR DIODE CONNECTED BETWEEN SAID INNER CONDUCTOR AND A SECOND WALL OF SAID WAVEGUIDE OPPOSITE SAID FIRST WALL, (1) SAID PROBE AND SAID COAXIAL TRANSMISSION LINE MATCHING THE IMPEDANCE OF SAID VARACTOR AT SAID FIRST FREQUENCY TO THE IMPEDANCE OF SAID OSCILLATOR CAVITY,, (2) SAID COAXIAL TRANSMISSION LINE APPLYING SAID OSCILLATOR SIGNAL BETWEEN SAID FIRST AND SECOND WALLS TO SAID WAVEGUIDE AND ACROSS SAID VARACTOR TO EXCITE SAID VARACTOR, (3) SAID VARACTOR BEING SELF-BIASED BY SAID OSCILLATOR SIGNAL AT A NEGATIVE BIAS VOLTAGE AND GENERATING AN OUTPUT SIGNAL AT A SECOND FREQUENCY AS A HARMONIC OF SAID OSCILLATOR SIGNAL, (E) A CONDUCTIVE SHORTING BLOCK CONNECTED IN SAID WAVEGUIDE CLOSELY SPACED FROM SAID VARACTOR TO PRESENT A LARGE INDUCTIVE REACTANCE TO SAID VARACTOR AT SAID SECOND FREQUECY OF SAID OUTPUT SIGNAL, (F) AN INDUCTIVE POST CONNECTED BETWEEN SAID FIRST AND SECOND WAVEGUIDE WALLS SPACED FROM SAID VARACTOR ON THE OPPOSITE SIDE THEREOF FROM SAID SHORTING BLOCK, (G) A CAPACITIVE PLUG THREADABLY MOUNTED IN SAID SECOND WAVEGUIDE WALL AND ADJUSTABLE PROTRUDING INTO SAID WAVEGUIDE, (1) SAID PLUG BEING DISPOSED INTERMEDIATE SAID VARACTOR AND SAID INDUCTIVE POST, (2) SAID SHORTING BLOCK, SAID INDUCTIVE POST, AND SAID CAPACITIVE PLUG TUNING SAID WAVEGUIDE TO PROPAGATE SAID OUTPUT SIGNAL WITH NEGLIGIBLE LOSS AND TO SUPPRESS SIGNAL AT FREQUENCIES OTHER THAN SAID SECOND FREQUENCY.