RF Power Combiner Balancing Circuit for Stable Plasma Signal Coupling
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Solution Overview
Problem
Existing power combiners for plasma process supply systems are limited in power output due to space constraints and suffer from inefficiencies and heat management issues, leading to undesirable power losses and phase distortions when connecting multiple RF signal sources.
Innovation Solution
A power combiner design with multiple inputs, inductors, and a balancing circuit featuring energy absorbers and a balancing line with a fixed characteristic impedance and length of n*λ/2, which decouples RF power amplifier stages and minimizes interference, allowing for higher output power and efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple RF power amplifier stages are connected to increase output power, then the output power increases, but the space requirements and device complexity increase
Solution Approach 1:
The power combiner is divided into multiple independent input ports, each with its own coupling element. This segmentation allows multiple RF amplifier stages to be connected without requiring a complex centralized structure, as each input can be independently managed and coupled to the output through dedicated elements.
Solution Approach 2:
The patent transitions from a planar arrangement to a three-dimensional structure by positioning coupling elements vertically above the input ports. This dimensional change allows multiple amplifiers to be connected in a compact footprint, increasing output power without proportionally increasing the device's horizontal space requirements.
2Productivity
If coupling elements are added to combine RF signals, then power combination efficiency improves, but energy losses and heat generation increase
Solution Approach 1:
The coupling elements serve multiple functions simultaneously: they combine RF signals from different inputs, provide impedance transformation, and act as part of the balancing circuit structure. This multi-functionality reduces the need for additional separate components that would otherwise contribute to energy losses.
Solution Approach 2:
The coupling elements are designed with specific inductance values and physical dimensions optimized for the operating frequency range. By carefully controlling these parameters, the coupling elements achieve efficient power combination while minimizing resistive losses and unwanted heating effects.
3Reliability
If a balancing circuit is implemented to decouple inputs, then signal stability and phase alignment improve, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The balancing circuit is merged with the coupling elements themselves rather than being implemented as separate additional components. The same inductive structures that couple signals to the output also provide the balancing function, simplifying the manufacturing process while maintaining signal stability and phase alignment.
Solution Approach 2:
The balancing circuit uses asymmetric connection topologies where inputs are differentially connected to the output through the coupling elements. This asymmetric arrangement provides effective decoupling and balancing without requiring symmetric pairs of components, thereby reducing manufacturing complexity.
4Power
If the number of RF amplifier stages is increased, then output power increases, but heat management becomes more difficult
Solution Approach 1:
By arranging coupling elements in the vertical dimension above the input ports, the patent enables better thermal management. This three-dimensional layout creates physical separation between heat-generating amplifier stages and allows for more effective heat dissipation paths without increasing the horizontal footprint.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design enables efficient power combination with reduced interference and heat management, ensuring high reliability and stability for plasma processes by maintaining precise signal coupling and phase alignment.
Implementation Method 1
a balancing line with a fixed characteristic impedance and a length of n*λ/2
Implementation Method 2
multiple coupling elements, in particular designed as inductors, wherein each coupling element connects one input to the main output
Implementation Method 3
having an energy absorber, in particular designed as a resistor
Data Source
AI summary
A power combiner for coupling RF signals, in particular designed for a plasma process supply system and a plasma process system, the power combiner being designed for a predefined operating frequency range with a frequency in the range of 2 MHz to 200 MHz, in particular in the range of 10 MHz to 50 MHz, designed for an output power ≥2 kW, preferably ≥4 kW, the power combiner including multiple inputs designed for connecting RF power amplifier stages, a main output, and multiple coupling elements, in particular designed as inductors, wherein each coupling element connects one input to the main output. The power combiner further includes a balancing circuit which connects the inputs to one another, having an energy absorber, in particular designed as a resistor, and a balancing line with a fixed characteristic impedance and a length of n*λ/2, where n∈.