Microwave frequency multiplier using a non-linear reactance

Claim 1

A FREQUENCY MULTIPLIER INCLUDING IN COMBINATION, INPUT MEANS ADAPTED TO RECEIVE ALTERNATING CURRENT SIGNALS AT A FUNDAMENTAL FREQUENCY, OUTPUT FILTER MEANS ADAPTED TO BE COUPLED TO A LOAD, A VARACTOR DIODE, COMPOUND TRANSMISSION LINE MEANS COUPLED TO SAID INPUT MEANS, FIRST TRANSMISSION LINE MEANS HAVING FIRST, SECOND AND THIRD PORTIONS COUPLING SAID COMPOUND TRANSMISSION LINE TO SAID VARACTOR DIODE, SAID COMPOUND TRANSMISSION LINE AND SAID FIRST TRANSMISSION LINE COOPERATING TO APPLY SAID ALTERNATING CURRENT SIGNALS TO SAID VARACTOR DIODE, SECOND TRANSMISSION LINE MEANS COUPLING SAID OUTPUT FILTER MEANS TO THE JUNCTION OF SAID FIRST AND SECOND PORTIONS, AN OPEN CIRCUITED TUNING STUB HAVING A VARIABLE ELECTRICAL LENGTH COUPLED TO THE JUNCTION OF SAID SECOND AND THIRD PORTIONS, SAID DIODE BEING RESPONSIVE TO SAID ALTERNATING CURRENT SIGNALS TO GENERATE HARMONIC SIGNALS THEREOF INCLUDING IDLER HARMONIC SIGNALS AND AN OUTPUT HARMONIC SIGNAL, SAID OUTPUT FILTER MEANS BEING RESPONSIVE TO SAID HARMONIC SIGNALS TO COUPLE SAID OUTPUT HARMONIC SIGNAL TO THE LOAD, THE LENGTH OF SAID OPEN CIRCUITED TUNING STUB AND SAID THIRD PORTION OF SAID FIRST TRANSMISSION LINE MEANS BEING ADJUSTED TO PROVIDE A FIRST