Patent ID: 7481904
Filing Date: 2009-01-27
Classification: H01J

Abstract:
1. A plasma apparatus comprising: a processing chamber carrying an element to be processed to perform a prescribed process thereon; an antenna having a plurality of loops, each formed by a conducting wire having a first end and a second end, to supply a radio-frequency wave into said processing chamber; and a radio frequency power supply to supply power to said antenna, wherein: each of said plurality of loops, having substantially a same perimetric length, is connected in parallel with said radio frequency power supply and is arranged radially on one and the same plane facing the element to be processed carried in said processing chamber, and the first and second conducting wire ends are located within an outermost periphery of each respective loop; the plurality of loops includes adjacent sides; a current flowing through one side of a first loop and a current flowing through an adjacent side of a second loop flow in a same direction; the plurality of loops comprises four loops arranged at an equal spacing to be rotationally symmetric; and a current flowing through a second side of the first loop and a current flowing through an adjacent side of a third loop flow in reverse directions.