One-Piece RF Match Strap Assembly for Low-Reflection RF Coupling
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Solution Overview
Problem
The existing multi-component RF coupling arrangement in SACVD processes experiences cyclical stress and impaired RF coupling due to the flexing of chamber lid straps, leading to reduced RF power transfer and potential arcing issues.
Innovation Solution
A one-piece RF match strap is introduced, which eliminates the connection between the fixed chamber lid strap and the RF match strap, providing structural rigidity and a continuous RF power transfer path from the RF match unit to the flexible chamber lid strap, ensuring efficient and constant RF power transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a multi-component RF coupling arrangement is used, then the RF match strap can be connected to the chamber lid strap, but cyclical stress and impaired RF coupling occur due to flexing of the chamber lid strap
Solution Approach 1:
The patent combines the RF match strap and chamber lid strap into a single integrated one-piece structure. This eliminates the connection interface between separate components, preventing cyclical stress and flexing that occurred in multi-component arrangements. The unified structure maintains both the flexibility needed for chamber lid operation and the RF coupling stability required for reliable power transfer.
2Ease of manufacture
If separate fixed chamber lid strap and RF match strap connections are used, then assembly is simplified, but structural rigidity is reduced leading to arcing issues
Solution Approach 1:
By merging the RF match strap and chamber lid strap into one continuous piece, the invention achieves optimal structural rigidity throughout the entire assembly. The one-piece construction eliminates weak connection points between separate components, providing uniform structural strength while preventing arcing issues. The integrated design maintains manufacturing simplicity through a single continuous structure.
3Reliability
If multiple connection points are used between RF match strap and chamber lid strap, then electrical connection is improved, but RF power decay increases due to repeated flexing
Solution Approach 1:
The patent eliminates multiple connection points by creating a continuous one-piece structure. This single uninterrupted conductive path prevents RF power decay that occurs at connection interfaces during repeated flexing. The merged design maintains excellent electrical connection stability throughout the operational life of the chamber, eliminating energy loss at connection points.
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 one-piece RF match strap maintains stable RF power transfer and reduces RF power decay and arcing issues, even with repeated opening and closing of the process chamber lid, minimizing RF reflections to less than 1 W.
Implementation Method 1
a one-piece RF match strap that has a head, a main body and a body extension. The main body of the one-piece RF match strap is configured to extend through the top electrically insulating column and the bottom electrically insulating column. In addition, a top of the one-piece RF match strap is configured to electrically contact an associated flexible chamber lid strap of the process chamber and a bottom of the one-piece RF match strap is configured to electrical connect with the RF match unit
Data Source
AI summary
A radio frequency (RF) match assembly for a chemical vapor deposition processing chamber. The assembly includes a top electrically insulating column and a bottom electrically insulating column. The assembly further includes a one-piece RF match strap that has a head, a main body and a body extension. The main body of the one-piece RF match strap is configured to extend through the top electrically insulating column and the bottom electrically insulating column. A flexible chamber lid strap connects the processing chamber to the top of the one piece RF match strap.