Patent ID: 6952949
Filing Date: 2005-10-11
Classification: H01J

Abstract:
1. An apparatus for coupling microwave energy into a plasma chemical vapor deposition (CVD) coating chamber ( 3 ), said apparatus comprising a cavity resonator for containing the coating chamber ( 3 ), a microwave feed ( 11 ) and microwave waveguides wherein the apparatus further has a substantially cylindrical shape and is provided at one end region (a) with a first coaxial waveguide having an internal conductor in the form of an antenna ( 12 ), at a central region (b) with an approximately cylindrical waveguide and at a second end region (c) with a second coaxial waveguide ( 1 ) having an internal conductor and a gas feed tube ( 13 ) through which gas can be provided into the coating chamber to be activated into a plasma state by coupled microwave energy having a transverse magnetic field line (TM)mode within the second end region (c), produced by the antenna ( 12 ).