Laser Textured Anti-Multipactor Coating for RF Components
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing anti-multipactor coatings for RF and MW components are inadequate in reducing secondary electron yield (SEY) and cannot effectively utilize gold due to chemical inertness, and existing production methods are inefficient and unsuitable for complex surfaces, leading to non-uniform textures and increased RF losses.
Innovation Solution
A method involving the deposition of gold, silver, or their alloys on metal substrates followed by femtosecond laser texturing to create regular patterns of cavities, which act as electron traps, reducing SEY and enhancing surface conductivity while allowing precise control over texture and localized application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If chemical etching is used to create anti-multipactor coating, then secondary electron yield is reduced, but the process cannot achieve uniform texture and requires immersion in chemical baths which limits localized application
Solution Approach 1:
The patent replaces chemical etching processes with laser-based texturing to create anti-multipactor surfaces. The laser method uses optical energy instead of chemical reactions, allowing precise control over surface texture without immersion in chemical baths, thereby achieving uniform texture while enabling localized application.
Solution Approach 2:
The patent modifies the surface texture parameters by controlling laser processing conditions (power, speed, pulse duration) to create optimal cavity structures that reduce secondary electron yield. By adjusting these parameters, uniform texture is achieved across the surface while maintaining the ability to apply treatment locally.
2Ease of manufacture
If photolithography is used to create micro-pores, then simple hole shapes are produced, but the process cannot handle three-dimensional surfaces or surfaces with large radius of curvature
Solution Approach 1:
The patent replaces photolithography with laser texturing technology. The laser method uses optical focusing to create micro-cavities directly on the surface without requiring photoresist layers or development processes, enabling treatment of complex three-dimensional surfaces, curved surfaces, and surfaces with varying geometries.
Solution Approach 2:
The patent extends the surface treatment capability from two-dimensional flat surfaces to three-dimensional complex surfaces by using laser focusing in the third dimension. The laser can be positioned and focused on surfaces with varying curvature and geometry, creating uniform micro-cavity patterns regardless of surface complexity.
3Productivity
If conventional laser texturing is used, then surface treatment is achieved, but the cavity interval pitch is too large to optimally reduce secondary electron yield
Solution Approach 1:
The patent optimizes the laser processing parameters including pulse duration, power density, and scanning speed to create micro-cavities with interval pitch between 0-100 μm. This parameter optimization ensures the cavities are closely spaced to effectively trap secondary electrons and reduce yield, while maintaining efficient processing speed.
Solution Approach 2:
The patent uses periodic laser pulsing to create regularly spaced micro-cavities on the surface. The periodic action of the laser ensures uniform cavity distribution with optimal spacing, creating a consistent texture pattern that maximizes electron trapping efficiency while maintaining processing productivity.
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 solution significantly reduces SEY and enhances transmission power by creating uniform, efficient electron traps on complex surfaces, improving RF signal transmission without increasing RF losses and allowing the use of gold, a previously challenging material.
Implementation Method 1
laser treatment of the coating deposited according to step (a), so as to obtain a texturing of the coating deposited, with one or more patterns repeated at regular intervals of cavities
Implementation Method 2
deposition of a coating of a constituent material chosen from the metals of column 10 or column 11 of the Mendeleev table or an alloy of these metals, on at least a surface portion of the metal substrate
Data Source
Figure 1~2B
Figure 3~5
Figure 6~8
AI summary
The invention relates to a method of producing by laser ablation on a metallic substrate an anti-multipactor coating whose constituent material is chosen from the metals of column 10 or column 11 of the Mendeleev table or an alloy of these metals and whose texture comprises one or more repeated patterns, at regular intervals of cavities, the pitch of the interval between two adjacent cavities being between 0 and 100 µm.