Variable frequency microwave cavity signal generator with regulated supply and feed-back compensation

Claim 1

A MICROWAVE SIGNAL GENERATOR COMPRISING A D.C. VOLTAGE SOURCE HAVING OUTPUT TERMINALS ACROSS WHICH AN OUTPUT VOLTAHE MAY BE TAKEN, ONE OF SAID TERMINALS INCLUDING VARIABLE IMPEDANCE MEANS IN SERIES THEREWITH, SAID VARIABLE IMPEDANCE MEANS BEING OF THE ELECTRON TUBE VARIETY HAVING AT LEAST CATHODE, CONTROL GRID, AND PLATE ELECTRODES WITH A CATHODE TO PLATE IMPEDANCE PATH WHICH IS VARIABLE IN IMPEDANCE IN ACCORDANCE WITH THE VOLTAGE APPLIED TO SAID CONTROL GRID; VOLTAGE AMPLIFIER MEANS HAVING AT LEAST CATHODE, CONTROL GRID, SCREEN GRID AND PLATE ELECTRODES AND ADAPTED TO CHANGE THE VOLTAGE APPLIED TO SAID CONTROL GRID OF SAID VARIABLE IMPEDANCE MEANS IN RESPONSE TO VOLTAGE VARIATIONS AT SAID CONTROL GRID OF SAID VOLTAGE AMPLIFIER MEANS; CENTER TAPPED LOAD IMPEDANCE MEANS; MEANS ELECTRICALLY CONNECTING SAID LOAD IMPEDANCE MEANS ACROSS SAID OUTPUT TERMINALS OF SAID VOLTAGE SOURCE SUCH THAT SAID VARIABLE IMPEDANCE MEANS AND SAID LOAD IMPEDANCE MEANS ARE IN SERIAL CONNECTION; MICROWAVE CAVITY OSCILLATOR MEANS ADAPTED TO OSCILLATE WHEN ENERGIZED BY A D.C. VOLTAGE OF AT LEAST A SELECTED MAGNITUDE; MEANS ELECTRICALLY CONNECTING SAID MICROWAVE OSCILLATOR MEANS ACROSS SAID OUTPUT TERMINALS OF SAID VOLTAGE SOURCE SUCH THAT SAID VARIABLE IMPEDANCE MEANS AND SAID MICROWAVE OSCILLATOR MEANS ARE IN SERIAL CONNECTION; NEGATIVE FEEDBACK MEANS INTERCONNECTING SAID CENTER TAP OF SAID LOAD IMPEDANCE MEANS AND SAID CONTROL GRID OF SAID VOLTAGE AMPLIFIER MEANS SUCH THAT THE IMPEDANCE OF SAID VARIABLE IMPEDANCE MEANS VARIES DIRECTLY AS THE VOLTAGE OF SAID CENTER TAP; FREQNENCY DETERMINING CIRCUIT MEANS ADAPTED TO RESONATE AT A FREQUENCY SUBSTANTIALLY BELOW THE MICROWAVE RANGE; MEANS ELECTRICALLY CONNECTING SAID FREQUENCY DETERMINING CIRCUIT MEANS BETWEEN SAID PLATE ELECTRODE OF SAID VARIABLE IMPEDANCE MEANS AND SAID CONTROL GRID OF SAID VOLTAGE AMPLIFIER MEANS SUCH THAT SAID FREQUENCY DETERMINING CIRCUIT AND SAID VOLTAGE AMPLIFIER MEANS WILL OSCILLATE AT SAID FREQUENCY SUBSTANTIALLY BELOW THE MICROWAVE RANGE; AND MEANS FOR VARYING THE CATHODE POTENTIAL OF SAID VOLTAGE AMPLIFIER MEANS IN ACCORDANCE WITH VARIATIONS IN VOLTAGE FED BACK TO SAID CONTROL GRID THEREOF FROM SAID PLATE ELECTRODE OF SAID VARIABLE IMPEDANCE MEANS VIA SAID FREQUENCY DETERMINING CIRCUIT MEANS.