Patent ID: 8031016

Claim:
A multiplying oscillator, comprising: a negative resistance unit having negative resistance characteristics; a resonance unit which is connected to the negative resistance unit, and outputs first and second resonance signals of mutually opposite phases in a fundamental wave; a frequency adjusting unit which is connected to the resonance unit, and suppresses first even harmonic of the resonance signal; and a synthetic unit which is connected to the resonance unit, and synthesizes an in-phase component of the first and second resonance signals and cancels an opposite-phase component of the first and second resonance signals, wherein the synthetic unit cancels odd harmonics and a fundamental wave of the resonance signals and outputs second even harmonic of the resonance signals, wherein the frequency adjusting unit includes a first frequency adjusting unit and a second frequency adjusting unit connected to both ends of the resonance unit, respectively, wherein the first frequency adjusting unit and the second frequency adjusting unit are respectively constructed in series connection of an adjustment inductor and a capacity for resonance and one end of the frequency adjusting unit is connected to the resonance unit and the other end is grounded, wherein the resonance unit is a line type resonator, and wherein the adjustment inductor is constructed of a line thinner than a line width of the line type resonator.