Foldable Paraboloid Antenna Mesh for High-Frequency Reflection
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Solution Overview
Problem
Existing foldable antenna designs for space applications, such as those using metallic fabrics, suffer from reduced frequency reflection capabilities due to the size of holes in the fabric, which allows high band frequencies to pass through and not be reflected, limiting their effectiveness above 60 GHz.
Innovation Solution
A computer-assisted method for manufacturing a foldable paraboloid antenna using a two-dimensional radial Origami pattern with triangular cells, where the pattern is projected onto a paraboloid surface, transformed into triangles with straight sides, and scaled to create a mesh with flexible segments acting as hinges, filled with reflective rigid material, and manufactured with a flexible mesh that avoids overlapping when folded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If metallic fabric is used to create a foldable antenna structure, then the antenna can be folded and unfolded, but the holes in the fabric allow high band frequencies (above 60 GHz) to pass through and not be reflected
Solution Approach 1:
The antenna surface is segmented into discrete triangular reflective elements arranged in an Origami pattern, separated by flexible mesh segments. This segmentation allows the structure to fold while maintaining continuous reflective surfaces that block high band frequencies, resolving the contradiction between foldability and frequency reflection capability.
Solution Approach 2:
A flexible mesh structure is used as the underlying support shell, allowing the rigid triangular reflective elements to be folded and deployed. The flexible mesh acts as a continuous substrate that maintains structural integrity during folding while supporting the reflective surfaces needed for high band frequency operation.
2Reliability
If a continuous reflective surface is used to reflect high band frequencies, then frequency reflection capability is improved, but the structure cannot be folded for space deployment
Solution Approach 1:
The continuous reflective surface is segmented into discrete triangular elements that maintain electrical continuity through the flexible mesh substrate. This segmentation enables folding capability while preserving the continuous reflective property needed for high band frequency operation above 60 GHz.
Solution Approach 2:
The antenna structure transitions from a static continuous surface to a dynamic segmented structure with flexible joints. The triangular reflective elements are connected through flexible mesh segments that allow folding motion, enabling the antenna to deploy from a compact configuration to a full operational paraboloid shape while maintaining frequency reflection capability.
3Volume of moving object
If the mesh segments are made narrow to reduce size, then the antenna compactness is improved, but the rigid triangles may overlap when folded
Solution Approach 1:
The width of the flexible mesh segments is optimized as a critical parameter to prevent rigid triangle overlap during folding. By carefully selecting the mesh segment width to be at least the sum of the thicknesses of adjacent rigid triangles, the design achieves compact folding capability while maintaining structural integrity and preventing interference between reflective elements.
Data Source
AI summary
A computer assisted method for manufacturing a foldable paraboloid antenna includes election of a two-dimensional radial Origami pattern with triangular cells and election of a paraboloid surface. The Origami pattern is projected from the paraboloid surface focus onto the paraboloid surface to print the Origami pattern on the paraboloid surface, obtaining triangles with curved sides. A pattern with triangles with straight sides on the paraboloid surface is obtained by joining vertices of the projected curved-sided triangles. The method includes scaling and calculating centroids of the triangles, to reduce each triangle referenced on the corresponding centroid and to determine spacing, obtaining a mesh with segments and triangular cells delimited by the segments. The triangular cells have triangles of reflective rigid material. The mesh is flexible, so each segment width is at least the sum of the thicknesses of two adjacent rigid triangles, and periphery cells have a rounded outer edge.