Patent ID: 6340863
Filing Date: 2002-01-22
Classification: A62D,B01D,B01J,C01B,H01J,H05B,H05H,Y02C,Y02P

Abstract:
A microwave plasma generator comprising:a rectangular waveguide having a hole to transmit a microwave; a coaxial microwave cavity connected to said rectangular waveguide by communicating with the hole; and a discharge tube which is made of a dielectric material, extends through the hole of said rectangular waveguide, and extends through said cavity so as to be coaxial with a central axis of said cavity, wherein said discharge tube has a double-tube structure including outer and inner tubes, a sectional area of an annular gap formed between said outer and inner tubes is constant over an entire length of said inner tube, and an end portion of said inner tube has a gas injection opening having the same diameter as an internal cavity of said inner tube.