Resonant Waveguide Plasma Source for Uniform Large-Area Treatment
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Solution Overview
Problem
Existing plasma sources struggle to uniformly generate plasma over large areas due to limitations in power application and uniformity, particularly in roll-to-roll processes for flexible materials like OLED thin films and functional fabrics, as conventional microwave plasma sources are limited by wavelength constraints.
Innovation Solution
A plasma generating apparatus using a resonant waveguide with an annular or elliptical central waveguide and multiple incoming waveguides arranged symmetrically to induce resonance and uniform power distribution, ensuring electromagnetic waves are uniformly maintained and radiated through slots into a plasma chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a conventional microwave plasma source is used, then the plasma treatment can be performed on base material, but the source size is limited to wavelength constraints and cannot cover large-area base material
Solution Approach 1:
The plasma source is divided into multiple linear sections (first linear section, second linear section, third linear section) that can be independently controlled. Each section has its own electromagnetic wave input capability through incoming waveguides, allowing the overall plasma area to be extended while maintaining uniformity in each segment. This segmentation enables the plasma source to cover large-area base material beyond conventional wavelength limitations.
2Device complexity
If electromagnetic waves are input from a single direction, then the device structure is simple, but the power distribution becomes non-uniform and plasma uniformity deteriorates
Solution Approach 1:
The waveguide structure employs asymmetric arrangement with multiple incoming waveguides positioned at different locations (first, second, third, and fourth incoming waveguides) to compensate for power distribution non-uniformity. This asymmetric configuration allows electromagnetic waves to be input from multiple directions, creating a more uniform overall power distribution across the plasma source despite the inherent asymmetry of individual waveguide positions.
Solution Approach 2:
Instead of accepting non-uniform power distribution as an inevitable consequence of single-direction wave input, the invention inverts the approach by introducing multiple wave input directions. The electromagnetic waves from different waveguides are arranged to propagate in coordinated directions, transforming the power distribution from non-uniform to uniform through multi-directional interference and energy distribution.
3Area of stationary object
If the base material size increases, then more area can be treated, but conventional plasma sources cannot maintain uniform plasma density across the entire area
Solution Approach 1:
The plasma source is divided into multiple linear sections (first linear section, second linear section, third linear section) that can be independently controlled. Each section has its own electromagnetic wave input capability through incoming waveguides, allowing the overall plasma area to be extended while maintaining uniformity in each segment. This segmentation enables the plasma source to cover large-area base material beyond conventional wavelength limitations.
Solution Approach 2:
Each linear section of the plasma source is designed with specific local characteristics, including dedicated incoming waveguides and slot arrangements optimized for that section. This local quality approach ensures that each segment maintains optimal plasma uniformity independently, while the combination of multiple segments achieves large-area coverage with overall uniformity.
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 apparatus achieves uniform plasma generation across large areas by maintaining electromagnetic wave power and density, addressing non-uniformity issues and enabling efficient plasma treatment on flexible materials.
Implementation Method 1
the electromagnetic waves input to the central waveguide in a normal direction are resonated with each other while traveling in a rotating manner along the central waveguide so that the resonating strong electromagnetic wave is generated in the central waveguide
Implementation Method 2
the electromagnetic waves introduced through the slots into the electromagnetic wave transmission window are radiated through the electromagnetic wave transmission window into the plasma chamber
Data Source
AI summary
A plasma generator by means of a resonant waveguide is disclosed. The plasma generator comprises: an annular or elliptical central waveguide that includes a plurality of slots on the inner side surface thereof; a first incident waveguide that is tangentially connected to the central waveguide to enable electromagnetic wave communication; an electromagnetic wave supply unit that transmits electromagnetic waves to the incident waveguide; and a plasma chamber that has an electromagnetic wave incident window which is positioned on an outlet side of the slots to seal the inside of the central waveguide, and through which electromagnetic waves introduced through the slots may be radiated to the outside.