Modular RF Matching Network for Plasma Impedance
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Solution Overview
Problem
Conventional radio frequency (RF) matching networks lack flexibility and cost-effectiveness in reconfiguring to handle different loads at varying power levels, particularly in larger plasma processing chambers with wider variations in impedance loads and increased RF power requirements.
Innovation Solution
A compact, configurable RF matching network assembly with a modular design using a fixed number of buses and connectors, allowing for various network topologies such as L, Π, and T configurations, which can be easily rearranged to match different impedance loads, incorporating fixed and variable impedance components with actuators for impedance adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional fixed-impedance matching networks are used, then the network structure is simple, but the adaptability to different impedance loads is poor
Solution Approach 1:
The patent applies the dynamics principle by implementing adjustable impedance components (variable capacitors and inductors) that can be dynamically tuned to match different load impedances. The matching network transitions from a static fixed-impedance design to a dynamic configurable design where component values can be changed based on the specific plasma chamber load requirements, thereby improving adaptability without requiring a complete redesign for each application.
Solution Approach 2:
The patent applies the universality principle by designing a modular matching network that can serve multiple plasma chamber configurations through a standardized interface. The network uses a combination of fixed and variable components that can be adjusted to handle various impedance ranges, making a single network design universally applicable to different chamber sizes and power levels rather than requiring dedicated networks for each application.
2Adaptability or versatility
If matching networks are reconfigured for different power levels, then the adaptability improves, but the cost and complexity of reconfiguration increases
Solution Approach 1:
The patent applies the segmentation principle by dividing the matching network into modular sections with standardized interfaces. This modular architecture allows the network to be segmented into reusable components that can be easily reconfigured for different power levels and chamber sizes. The segmentation enables independent adjustment of impedance components without requiring changes to the entire network structure, thereby reducing reconfiguration cost and complexity.
Solution Approach 2:
The patent applies the parameter changes principle by using variable impedance components whose electrical parameters (capacitance and inductance values) can be adjusted to optimize performance for different power levels. Rather than physically replacing components, the network achieves reconfiguration by changing the electrical parameters of existing components through adjustable switches or variable elements, significantly reducing reconfiguration cost and complexity.
3Loss of energy
If high-Q components are used to minimize losses, then the energy efficiency improves, but the tuning range is limited
Solution Approach 1:
The patent resolves this contradiction by implementing a dynamic impedance matching network with adjustable high-Q components. The network uses variable capacitors and inductors that maintain high quality factors while allowing continuous adjustment of their reactance values. This enables the network to minimize RF energy losses through high-Q operation while simultaneously providing a broad tuning range to accommodate different plasma chamber impedances and power levels.
Solution Approach 2:
The patent applies preliminary action by pre-configuring the matching network with a set of high-Q components designed for specific impedance ranges. Before operation, the network can be pre-tuned or pre-configured for the anticipated load conditions, allowing it to start operation with optimal efficiency. The preliminary configuration of high-Q components ensures low energy losses while the adjustable nature of these pre-configured components provides the necessary tuning range for different applications.
Data Source
AI summary
A compact configurable radio frequency (RF) matching network for matching RF energy output from an RF generator to a variable impedance load is disclosed. The matching network includes an input connector; an output connector; and a component assembly array including one or more tune and load electrical components. At least one of the electrical components is coupled to the input connector, at least one of the electrical components is coupled to the output connector, the component assembly array is adapted to be arranged in a selected topology, and the selected topology is adapted to reduce RF energy reflected from the variable impedance load. Numerous other aspects are provided.