Ray S Braden

US Patent:

40428508, Aug 16, 1977

Filed:

Mar 17, 1976

Appl. No.:

5/667759

Inventors:

Michael Gerson Ury - Bethesda MD
Bernard John Eastlund - Olney MD
Ray S. Braden - Gaithersburg MD
Charles H. Wood - Rockville MD

Assignee:

Fusion Systems Corporation - Rockville MD

International Classification:

H01J 746
H01J 1980

US Classification:

315 39

Abstract:

An apparatus for efficiently coupling microwave energy to a highly dissipative load such as a plasma lamp tube. A longitudinally extending lamp tube is enclosed in a longitudinally extending non-resonant microwave chamber having a pair of coupling slots therein which are oriented perpendicular to the direction of the lamp tube. The slots are azimuthally offset in opposite directions with respect to a longitudinally extending top center line of the chamber by about 15. degree. to 20. degree. , and are located near respective ends of the chambers but at different distances therefrom. Microwave energy from a pair of microwave energy generating means is coupled to the respective slots with the frequency outputs of the generating means being offset from each other by a small amount.