Patent ID: 6372084
Filing Date: 2002-04-16
Classification: C23C,H01J

Abstract:
A dielectric plate adapted to be provided between a process chamber of a plasma processing apparatus and a slot electrode guiding a microwave used for a plasma process,wherein a thickness H of said dielectric plate has a predetermined relationship with a wavelength &lgr; of the microwave in said dielectric plate so that an amount of isolation of said dielectric plate due to transmission of the microwave is minimized, the wavelength &lgr; being represented by &lgr;=&lgr;0n, where &lgr;0 is a wavelength of the microwave in a vacuum and n is a wavelength reducing rate of said dielectric plate represented by n=1/(&egr;t)Â½, where &egr;t is a specific dielectric rate of said dielectric plate in a vacuum.