Automatic impedance matching apparatus and method
First Claim
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1. A method of impedance matching a source to a load using a multi-stub tuner positioned between the source and the load comprising:
- a) determine a reflection coefficient associated with the load;
b) determining scattering parameters of the multi-stub tuner;
c) determining scattering parameters of the multi-stub tuner that theoretically match the source impedance to the load impedance;
d) determining stub displacements from current stub positions of the multi-stub tuner to positions corresponding to the scattering parameters of the multi-stub tuner that theoretically match the source impedance to the load impedance provided that the load impedance remains constant as the stub positions are varied;
e) determining scaled stub displacements by combining the stub displacements with a scaling factor;
f) moving the stubs a distance corresponding to the scaled stub displacements; and
g) repeating steps a-f until the magnitude of the reflection coefficient is less than a predetermined value.
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Abstract
Methods for rapidly adjusting the impedance of a variable impedance apparatus to match the impedance of a source to the impedance of a load, where the load impedance is a nonlinear function of the power delivered to the load, are described. In addition, an automatic impedance matching apparatus for matching the impedance of a source to the impedance of a load and for maintaining a stable plasma are described. The apparatus includes a variable impedance apparatus, a plurality of electric field sensors, a photosensitive detector, a data processor, and a memory.
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Citations
14 Claims
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1. A method of impedance matching a source to a load using a multi-stub tuner positioned between the source and the load comprising:
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a) determine a reflection coefficient associated with the load; b) determining scattering parameters of the multi-stub tuner; c) determining scattering parameters of the multi-stub tuner that theoretically match the source impedance to the load impedance; d) determining stub displacements from current stub positions of the multi-stub tuner to positions corresponding to the scattering parameters of the multi-stub tuner that theoretically match the source impedance to the load impedance provided that the load impedance remains constant as the stub positions are varied; e) determining scaled stub displacements by combining the stub displacements with a scaling factor; f) moving the stubs a distance corresponding to the scaled stub displacements; and g) repeating steps a-f until the magnitude of the reflection coefficient is less than a predetermined value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification