Patent ID: 7156949

Claim:
A method for applying specified plasma processing to a processing object using a plasma processing apparatus having first and second electrodes substantially arranged in parallel in a processing chamber the method comprising: applying from a first high-frequency power supply a first high-frequency power to one of the first and second electrodes through a first power supply line; applying from a second high-frequency power supply a second high-frequency power to one of the first and second electrodes through a second power supply line; using a first filter circuit to attenuate the second high-frequency power flowing into the first high-frequency power supply through the first power supply line; tuning the first filter circuit to a circuit constant that is substantially offset from an optimum resonance point most attenuating the second high-frequency power to a less effective resonance point; using a second filter circuit to attenuate the first high-frequency power flowing into the second power supply line; and tuning the second filter circuit to a circuit constant that is not substantially offset from an optimum resonance point most attenuating the first high frequency power.