Patent ID: 7445690

Claim:
A plasma processing apparatus, comprising: a chamber for containing a substrate to be processed; a gas supply unit for supplying a processing gas into the chamber; and a microwave introducing unit for introducing plasma generating microwaves into the chamber, the microwave introducing unit including: a microwave oscillator for outputting a plurality of microwaves having specified outputs; and an antenna section having a plurality of antennas to which the microwaves outputted from the microwave oscillator are respectively transmitted, wherein the microwave oscillator has: a microwave generator for generating a low power microwave; a divider for dividing the microwave generated from the microwave generator into a plurality of microwaves; and a plurality of amplifier sections for amplifying respective microwaves divided by the divider to specified powers, and wherein a plurality of microwaves outputted from the plurality of amplifier sections are respectively transmitted to the plurality of antennas, and wherein each of the plurality of amplifier sections has: a variable attenuator for attenuating a microwave outputted from the divider to a predetermined level; a solid state amplifier for amplifying a microwave outputted from the variable attenuator to a specified power; and a matcher for regulating a power of a reflected microwave returning to the solid state amplifier from the antenna.