Patent ID: 8716153

Claim:
A device, having a microwave plasma device, comprising at least one electrode ( 21 , 22 , 23 ) which is connectable to a microwave generator ( 20 ), wherein the at least one electrode ( 21 , 22 , 23 ) comprises a coaxial inner conductor ( 21 ) made from electrically conductive material as well as a coaxial outer conductor ( 22 ) made from electrically conductive material, which at least partially surrounds the coaxial inner conductor and is spaced therefrom; wherein the coaxial outer conductor ( 22 ) comprises in its longitudinal direction at least one first region ( 31 ), in which the coaxial outer conductor completely surrounds the coaxial inner conductor, and at least one further region ( 32 ), in which the coaxial outer conductor is formed such that it tapers or narrows, in particular in a constant manner, from said first region ( 31 ), and thus surrounds the coaxial inner conductor ( 21 ) less and less, such that microwave radiation generated by the microwave generator ( 20 ) may exit from the at least one further region ( 32 ) substantially perpendicular to the longitudinal axis of the coaxial inner conductor ( 21 ), when the at least one electrode ( 21 , 22 , 23 ) is connected to the microwave generator ( 20 ); and wherein the at least one electrode comprises a connecting end for connecting the microwave generator and a free end, wherein the coaxial outer conductor tapers towards the free end.