Plasma processing device and plasma generating method
First Claim
1. A plasma processing device characterized by comprising:
- a table for placing a target object thereon;
a processing vessel for accommodating said table; and
a slot antenna arranged to oppose said table to supply an electromagnetic field into said processing vessel, wherein radiation coefficients of a plurality of slots formed in an antenna surface of said slot antenna increase monotonously in a radial direction of the antenna surface from a central portion of the antenna surface until a first intermediate portion on the way to a peripheral portion, and maintain values obtained at the first intermediate portion from the first intermediate portion toward the peripheral portion.
1 Assignment
0 Petitions
Accused Products
Abstract
The length (L) of a slot (26) increases monotonously from the central portion (A) of an antenna surface (28) in the radial direction, and reaches the maximal value at the first intermediate portion (C). The maximal value is maintained from the first intermediate portion (C) until the peripheral portion (B). When compared to a case wherein the length of the slot is increased monotonously from the central portion of the antenna surface (28) until its peripheral portion, the power radiated from a slot antenna can increase. Accordingly, the power which is not radiated from the slot antenna but remains in it decreases, so that the reflected power from the slot antenna decreases.
7 Citations
14 Claims
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1. A plasma processing device characterized by comprising:
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a table for placing a target object thereon;
a processing vessel for accommodating said table; and
a slot antenna arranged to oppose said table to supply an electromagnetic field into said processing vessel, wherein radiation coefficients of a plurality of slots formed in an antenna surface of said slot antenna increase monotonously in a radial direction of the antenna surface from a central portion of the antenna surface until a first intermediate portion on the way to a peripheral portion, and maintain values obtained at the first intermediate portion from the first intermediate portion toward the peripheral portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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- 13. A plasma generating method characterized in that when an electromagnetic field is supplied into a processing vessel by using a slot antenna in which a plurality of slots are formed in an antenna surface thereof, to generate a plasma, radiation coefficients of the slots are increased monotonously from a central portion of the antenna surface until the first intermediate portion on the way to a peripheral portion, and values of the radiation coefficients obtained at the first intermediate portion are maintained from the first intermediate portion toward the peripheral portion.
Specification