Multilayer Millimeter-Wave Window With Perforated Thermal Conductors
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Solution Overview
Problem
High-frequency electromagnetic radiation systems require windows that are transparent, have low thermal resistance, and can handle high power levels, but existing materials like synthetic diamond are expensive and limited in size, and common materials become less effective at millimeter-wave frequencies due to high loss tangents.
Innovation Solution
A multilayer window design featuring thermally conductive elements with multiple perforations and a dielectric seal between them, which provides transparency, thermal conductivity, and vacuum tightness, allowing for efficient heat dissipation and reduced thermal resistance, while being adaptable to various frequencies and surface shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If synthetic diamond is used as window material, then transparency and thermal conductivity are improved, but cost and availability in large sizes worsen
Solution Approach 1:
The window is divided into multiple separate elements arranged in a multilayer configuration. Each element can be manufactured independently using more economical materials, and the overall window performance is achieved through the combined effect of multiple layers with specific perforation patterns and spacing.
Solution Approach 2:
The invention uses composite structures combining thermally conductive elements with perforations and dielectric materials. This composite approach allows achieving the thermal and electromagnetic performance of synthetic diamond through a combination of more affordable materials with optimized geometric configurations.
2Ease of manufacture
If common materials are used for windows, then cost is reduced, but effectiveness at millimeter-wave frequencies worsens due to high loss tangents
Solution Approach 1:
The thermally conductive elements incorporate periodic arrays of perforations (holes) that create a porous structure. This porous configuration allows common materials to achieve transparency at millimeter-wave frequencies by enabling electromagnetic wave passage through the perforations while maintaining thermal conductivity through the solid material framework.
Solution Approach 2:
The invention optimizes specific parameters including perforation diameter, spacing, pattern geometry, and layer spacing to achieve frequency-selective transparency. By carefully tuning these geometric parameters, common materials can be made effective at specific millimeter-wave frequencies despite their inherently higher loss tangents.
3Area of stationary object
If a single large window is used, then size requirements are met, but cost and thermal management worsen
Solution Approach 1:
Instead of using a single large window element, the invention segments the window into multiple smaller elements arranged in layers. This segmentation allows each element to be manufactured more economically and facilitates better thermal management through distributed heat paths, while the overall assembly achieves the required aperture size.
Solution Approach 2:
The invention transitions from a two-dimensional single-plane window to a three-dimensional multilayer structure. By adding the depth dimension with multiple spaced layers, the system achieves large effective aperture area while maintaining manageable individual element sizes and improved thermal conductivity through the layered configuration.
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 multilayer window design effectively transmits millimeter-wave radiation with minimal loss and heat dissipation, maintaining transparency and structural integrity, even in large sizes, by using thermally conductive elements and a dielectric seal, optimizing perforation patterns for specific frequencies and shapes.
Implementation Method 1
The window includes multiple perforations in a thermally conductive element to be disposed in the path of the passing wave
Implementation Method 2
A dielectric is positioned between at least two thermally conductive elements and acts as a seal between the wave source and an ambient environment
Implementation Method 3
The metallic plate is made transparent over a range of frequencies by perforating it with a periodic array of slots
Data Source
AI summary
Methods and apparatus for a multilayer millimeter-wave window according to various aspects of the present invention operate in conjunction with a multilayer window that is substantially transparent to a passing millimeter-wave. The window may include multiple perforations in a thermally conductive element to be disposed in the path of the passing wave. A dielectric is positioned between each thermally conductive element and acts as a seal between wave source and art ambient environment. The window may also be configured to conform to a contoured surface or structure.