3D Printed Slow-Wave Structures for Millimeter-Wavelength Devices
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Solution Overview
Problem
Current methods for fabricating slow-wave structures for high-power vacuum electronic devices operating at millimeter-wavelength and terahertz-frequency bands are costly, complex, and environmentally unfriendly due to the need for precise fabrication techniques, such as LIGA, DRIE, EDM, CNC machining, and Laser Ablation, which are not always effective for producing features smaller than a fraction of a millimeter.
Innovation Solution
A 3D printing process is used to fabricate slow-wave structures and electromagnetic meta-material structures by loading a digital model into a 3D printer, depositing metal powder, melting, and solidifying it layer by layer, allowing for precise construction of elements with dimensions and spacings suitable for millimeter-wavelength and terahertz-frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional fabrication methods (LIGA, DRIE, EDM, CNC machining, Laser Ablation) are used to achieve precise dimensions and spacings, then manufacturing precision is improved, but device complexity and cost increase, and environmental harm worsens
Solution Approach 1:
The patent changes the fundamental fabrication parameter from subtractive/removal-based methods to additive layer-by-layer deposition. This allows achieving the same manufacturing precision (dimensions and spacings comparable to or less than wavelength) through a different physical process (3D printing) that inherently reduces process complexity and environmental impact while maintaining the required precision for millimeter-wavelength and terahertz-frequency operation
Solution Approach 2:
The patent replaces complex mechanical fabrication systems (CNC machining, EDM, LIGA) with a 3D printing system that uses digital modeling and automated layer-by-layer construction. This substitution reduces device complexity by eliminating multiple fabrication steps, tooling requirements, and manual interventions while maintaining manufacturing precision through software-controlled deposition
2Manufacturing precision
If traditional fabrication methods are used to achieve precise features smaller than a fraction of a millimeter, then manufacturing precision is improved, but productivity decreases and loss of time increases
Solution Approach 1:
The patent applies preliminary action by creating a complete digital 3D model of the slow-wave structure before fabrication. This digital prototype allows for virtual verification of dimensions and spacings, enabling rapid iteration and design optimization before physical manufacturing begins. The digital model is then directly used to guide the 3D printing process, eliminating time-consuming intermediate steps such as toolpath programming, fixture setup, and manual measurement adjustments required by traditional methods
Solution Approach 2:
The patent changes the fabrication parameter from sequential subtractive removal to parallel additive construction. The 3D printing process can deposit multiple layers and features simultaneously in a single build operation, achieving the same sub-fraction-millimeter precision while dramatically improving productivity by reducing the total fabrication time and eliminating the need for multiple separate machining operations
3Manufacturing precision
If traditional fabrication methods are used to achieve precise dimensions, then manufacturing precision is improved, but environmental harm worsens
Solution Approach 1:
The patent extracts and eliminates the harmful elements from the fabrication process by replacing methods that use toxic chemicals (LIGA photoresists, DRIE plasma chemistry, EDM dielectric oils) with a 3D printing process that uses metal powder and binder materials. This extraction removes the source of environmental contamination while maintaining the ability to achieve precise dimensions and spacings through controlled material deposition
Solution Approach 2:
The patent converts the potential harm of material waste in traditional subtractive methods into a benefit by using additive manufacturing. Instead of removing large amounts of material that must be disposed of as hazardous waste, the 3D printing process deposits only the necessary material to create the slow-wave structure, transforming the waste problem into material efficiency and environmental sustainability
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
Enables rapid and cost-effective fabrication of prototypes during the design phase, reducing the complexity and environmental impact of traditional methods while achieving precise dimensions and spacings necessary for high-power vacuum electronic devices.
Implementation Method 1
operating the 3D printer to deposit a layer of the metal powder material having a thickness at least ten times less than the lesser of the predetermined dimensions of each one of the elements of electrically conductive material and/or the predetermined distance between these elements of electrically conductive material
Implementation Method 2
melting the deposited layer of the metal powder material in accordance with the loaded three dimensional model of the slow-wave structure to transform the deposited layer of the metal powder material into a layer of melted metal shaped in accordance with the loaded three dimensional model of the slow-wave structure
Implementation Method 3
solidifying the layer of melted metal to transform it into a layer of solid metal shaped in accordance with the loaded three dimensional model of the slow-wave structure
Data Source
AI summary
A method for fabricating slow-wave structures, including electromagnetic meta-material structures, for high-power slow-wave vacuum electronic devices operating in millimeter-wavelength (30 GHz-300 GHz) and terahertz-frequency (300 GHz and beyond) bands of electromagnetic spectrum. The method includes: loading a digital three dimensional model of a slow-wave structure in a memory of a 3D printer, the loaded digital three dimensional model having data therein representative of the slow-wave structure to be fabricated by the 3D printer; loading metal powder material into the 3D printer; and operating the 3D printer to melt the metal powder material in accordance with the loaded three dimensional model of the slow-wave structure and then to solidify the melted layer of the metal powder material to fabricate the slow-wave structure layer by layer.