Patent ID: 8961756
Filing Date: 2015-02-24
Classification: H01J

Abstract:
1. A two-level folded magnetron including an outer magnetic pole of one polarity surrounding an inner magnetic pole of another polarity at least partially opposed to the one polarity and separated therefrom by a gap extending in a closed path, the path including two generally parallel sub-paths each extending from a head to a tail thereof along a respective folded pattern including a first straight portion extending form the head to a first 180° corner, a second straight portion extending from the first 180° corner to a second 180° corner, and a third straight portion extending from the second 180° corner to the tail, both the first and third straight portions of each of the two sub-paths extending along a respective axis common to the first and third straight portions and parallel to the corresponding second straight portion, wherein the head comprises a third 180° corner linking and extending between ends of the two respective first straight portions of the two sub-paths and the tail comprises a fourth 180° corner linking and extending between ends of the two respective third straight portions of the two sub-paths.