METHOD AND APPARATUS FOR IMPEDANCE MATCHING IN A POWER DELIVERY SYSTEM FOR REMOTE PLASMA GENERATION
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United States of America Patent
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Issued Date -
Jun 13, 2024
app pub date -
Feb 26, 2024
filing date -
Aug 19, 2021
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Abstract
A plasma-generation system is provided that includes a variable-frequency microwave generator configured to generate microwave power and a plasma applicator configured to use the microwave power from the microwave generator to (i) ignite a process gas therein for initiating a plasma in a plasma ignition process and (ii) maintain the plasma in a steady state process. The system also includes a coarse tuner connected between the microwave generator and the plasma applicator. At least one physical parameter of the coarse tuner is adapted to be set to achieve coarse impedance matching between the microwave generator and the plasma generated during both the plasma ignition process and the steady state process. A load impedance of the plasma generated during the plasma ignition process and the steady state process is adapted to vary. The microwave generator is configured to tune an operating frequency at the set physical parameter of the coarse tuner.
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