Shunt-type coaxial to waveguide harmonic generator

Claim 1

A HARMONIC GENERATOR WHICH COMPRISES (A) A COAXIAL ASSEMBLY HAVING INNER AND OUTER CONDUCTORS AND BEING TERMINATED AT ONE END IN A SHORT CIRCUIT, SAID INNER CONDUCTOR COMPRISING FIRST AND SECOND SPACED SEGMENTS FORMING A GAP CAPACITANCE THEREBETWEEN, THE FIRST SEGMENT HAVING AN ADJUSTABLE LENGTH TO PERMIT VARIATION OF SAID CAPACITANCE, (B) A VARACTOR DIODE MOUNTED IN SHUNT BETWEEN THE SECOND SEGMENT OF SAID INNER CONDUCTOR AND SAID OUTER CONDUCTOR OF THE ASSEMBLY, SAID DIODE DIVIDING THE COAXIAL ASSEMBLY INTO AN INPUT AND AN OUTPUT SECTION, SAID INPUT SECTION HAVING AN ELECTRICAL LENGTH OF ABOUT ONE-EIGHTH OF A WAVELENGTH AT THE INPUT FREQUENCY TO PROVIDE A LOW INDUCTIVE REACTANCE AT THE INPUT FREQUENCY AND A SUBSTANTIALLY ANTI-RESONANT TRAP AT THE SECOND HARMONIC OF THE INPUT FREQUENCY, THE COMBINATION OF SAID INPUT SECTION, THE CAPACITANCE OF SAID VARACTOR DIODE, AND SAID GA CAPACITANCE BEING TUNED TO SERIES RESONANCE AT THE INPUT FREQUENCY, (C) MEANS FOR COUPLING A SIGNAL AT THE INPUT FREQUENCY TO SAID INPUT SECTION,