Generalized cylindrical cavity system for microwave rotation and impedance shifting by irises in a power-supplying waveguide
First Claim
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1. A plasma reactor comprising:
- a workpiece processing chamber;
a cylindrical microwave cavity overlying the workpiece processing chamber, and a plurality of microwave input ports arranged asymmetrically about a center axis of the cylindrical microwave cavity, the plurality of microwave input ports including first and second input ports, P and Q, in a sidewall of said cylindrical microwave cavity spaced apart by an oblique azimuthal offset angle Δ
θ
;
a microwave source having first microwave modules that provides a first microwave source output having a microwave frequency, and a second microwave module that provides a second microwave source output having the microwave frequency and separated by a temporal phase difference Δ
Ø
from the first microwave source output;
a pair of respective waveguides, each of said respective waveguides having a microwave input end coupled to a respective one of said microwave source outputs and a microwave output end coupled to a respective one of said first and second input ports;
a seed signal generator having a first output signal coupled to the first microwave module and a second output signal coupled to the second microwave module, the seed signal generator configured to generate first and second output signals that generate rotating microwaves of mode TEmnl or TMmnl in said cylindrical microwave cavity, wherein m, n and l are user-selected values of a TE or TM mode.
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Abstract
A rotating microwave is established for any resonant mode TEmnl or TMmnl of a cavity, where the user is free to choose the values of the mode indices m, n and l. The fast rotation, the rotation frequency of which is equal to an operational microwave frequency, is accomplished by setting the temporal phase difference ΔØ and the azimuthal angle Δθ between two microwave input ports P and Q as functions of m, n and l. The slow rotation of frequency Ωα (typically 1-1000 Hz), is established by transforming dual field inputs α cos Ωαt and ±α sin Ωαt in the orthogonal input system into an oblique system defined by the angle Δθ between two microwave ports P and Q.
25 Citations
19 Claims
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1. A plasma reactor comprising:
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a workpiece processing chamber; a cylindrical microwave cavity overlying the workpiece processing chamber, and a plurality of microwave input ports arranged asymmetrically about a center axis of the cylindrical microwave cavity, the plurality of microwave input ports including first and second input ports, P and Q, in a sidewall of said cylindrical microwave cavity spaced apart by an oblique azimuthal offset angle Δ
θ
;a microwave source having first microwave modules that provides a first microwave source output having a microwave frequency, and a second microwave module that provides a second microwave source output having the microwave frequency and separated by a temporal phase difference Δ
Ø
from the first microwave source output;a pair of respective waveguides, each of said respective waveguides having a microwave input end coupled to a respective one of said microwave source outputs and a microwave output end coupled to a respective one of said first and second input ports; a seed signal generator having a first output signal coupled to the first microwave module and a second output signal coupled to the second microwave module, the seed signal generator configured to generate first and second output signals that generate rotating microwaves of mode TEmnl or TMmnl in said cylindrical microwave cavity, wherein m, n and l are user-selected values of a TE or TM mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification