Tessellated Polyhedral RF Housing for Signal Transparency
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Solution Overview
Problem
Existing materials for RF antenna housings, such as traditional honeycombs and foams, are either too dense and heavy or anisotropic to radio frequency signals, which affects signal processing capability and weight optimization in applications like aircraft.
Innovation Solution
A tessellated polyhedral material comprising various polyhedral cells, such as rhombic dodecahedra, tetrahedrons, and octahedrons, filled with conductive or magnetic materials, or coated with conductive ink, is used to create a structure that is partially or fully transparent to RF signals, offering improved mechanical strength and isotropy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional honeycombs are used for RF antenna housings, then structural support is provided, but the material becomes anisotropic to RF signals, negatively impacting signal processing capability
Solution Approach 1:
The structure is divided into multiple polyhedral cells (such as rhombic dodecahedra, tetrahedrons, and octahedrons) arranged in a tessellated pattern. This segmentation creates a more uniform distribution of RF signal transmission paths compared to traditional honeycombs, reducing anisotropy while maintaining structural support through the cellular architecture.
Solution Approach 2:
The patent combines multiple polyhedral cell types in specific ratios to create a composite cellular structure. This composite approach allows optimization of both mechanical properties (structural support) and electromagnetic properties (RF signal transparency), resolving the contradiction between strength and signal processing capability.
2Reliability
If foams are used for RF antenna housings, then RF signal transparency is achieved, but the material becomes dense and heavy, compromising weight optimization
Solution Approach 1:
The patent employs a porous cellular structure composed of polyhedral cells with controlled wall thicknesses (0.1mm to 4mm). This porous architecture provides RF signal transparency similar to foams while significantly reducing density and weight through the hollow cellular configuration, eliminating the need for dense foam materials.
Solution Approach 2:
By segmenting the structure into discrete polyhedral cells with open spaces, the material achieves RF transparency without requiring the continuous dense matrix found in traditional foams. The segmented cellular layout allows RF signals to pass through while maintaining structural integrity with minimal material usage, thus reducing weight.
3Strength
If the face thickness of polyhedral cells is increased to improve mechanical strength, then structural support is enhanced, but RF signal transmission loss increases
Solution Approach 1:
The patent optimizes the face thickness parameter within a specific range (0.1mm to 4mm, preferably 0.3mm to 2mm, most preferably about 0.5mm). This parameter optimization balances mechanical strength requirements with RF signal transmission needs, finding the optimal thickness that provides sufficient structural support while minimizing RF signal attenuation through the cell walls.
Solution Approach 2:
The use of composite cellular structures with optimized polyhedral geometry allows for reduced wall thickness compared to traditional structures. The efficient load distribution in the tessellated polyhedral arrangement enables thinner faces that maintain mechanical strength while improving RF signal transparency.
Data Source
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AI summary
The present invention provides a structure at least partially transparent to radio frequency signals, the structure being formed of a tessellated polyhedral material comprising a plurality of polyhedral cells. The present invention also provides a method of manufacturing the same.