Multi-order wave voltage controlled oscillator

A multi-order wave voltage controlled oscillator (VCO), comprising:

• a power impedance matching unit, comprising an input end, a first transmission line and an output end, the input end for inputting an external voltage, the first transmission line disposed between the input end and the output end and performing impedance matching on an output signal sent to the output end, wherein the first transmission line is a ¼-wavelength transmission line based on a wavelength of an output harmonic wave;
• a signal transmitting unit, comprising a plurality of upper inductors and a plurality of lower inductors disposed correspondingly to the upper inductors, each of the upper inductors having one end electrically connected to the output end, each of the lower inductors having one end electrically connected to a ground end;
• a harmonic wave eliminating unit, comprising a plurality of transistors disposed between and electrically connected to the upper inductors and the lower inductors, each of the transistors having a drain electrically connected to a gate of the adjacent transistor to form a multi-order ring loop;
• and
• an oscillation frequency adjusting unit, comprising a plurality of varactors, each of the varactors having one end electrically connected to a power output end of the corresponding transistor and one other end of the corresponding lower inductor, and one other end electrically connected to an tuning voltage.