Fixed Mesh Antenna Reflector Surface Accuracy
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Solution Overview
Problem
Current solid surface and fixed mesh reflectors face challenges in achieving high surface accuracy for high operational frequencies, such as Ka-Band, due to fabrication errors, thermal distortions, and increased mass, making them unsuitable for larger diameters.
Innovation Solution
A manufacturing process for a fixed mesh reflector that involves assembling a support structure, tensioning a mesh on a mold, attaching the support structure to the mesh, measuring and adjusting the geometry, and permanently connecting them to achieve improved surface accuracy and geometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If solid surface reflectors are used for large diameters, then surface accuracy may be achieved, but mass increases significantly
Solution Approach 1:
The patent employs a thin mesh surface structure instead of solid surface panels. The mesh is stretched over a support structure of splines and ribs, creating a lightweight yet accurate reflector surface. This flexible membrane approach allows achieving required surface accuracy for Ka-band frequencies while maintaining low mass, directly resolving the contradiction between surface accuracy and reflector mass for large diameter antennas.
2Weight of stationary object
If fixed mesh reflectors are used to reduce mass, then mass decreases, but surface accuracy decreases for diameters greater than 2 meters
Solution Approach 1:
The support structure is divided into multiple segments including ribs, splines, and adjustable support elements distributed across the reflector surface. This segmentation allows each element to be independently positioned and adjusted, enabling precise control of the mesh surface geometry across large diameters while maintaining low mass. The segmented approach overcomes the surface accuracy limitation of conventional fixed mesh designs.
Solution Approach 2:
The patent incorporates adjustable support elements that can be modified during assembly and operation to optimize surface accuracy. The splines and support structures include adjustment mechanisms allowing dynamic tuning of the mesh surface geometry, transforming the static fixed mesh design into a dynamically adjustable system capable of achieving high surface accuracy for large diameter reflectors.
3Reliability
If solid surface reflectors are used for high operational frequencies, then reflectivity is maintained, but mass increases significantly
Solution Approach 1:
The mesh surface, while thin and lightweight, is designed with sufficient conductivity and surface continuity to maintain reflectivity performance for high operational frequencies including Ka-band and V-band. The mesh structure with its conductive elements provides the necessary electromagnetic reflection properties without requiring solid surface panels, thus maintaining reliability while reducing mass.
Solution Approach 2:
The patent utilizes a mesh structure with controlled porosity that maintains electromagnetic reflection properties. The mesh openings are sized and distributed to preserve surface continuity for radio frequency waves while significantly reducing mass compared to solid surfaces. This porous mesh design achieves both low mass and maintained reflectivity performance for high frequency applications.
4Ease of manufacture
If conventional manufacturing techniques are used, then production is simplified, but thermal distortions and fabrication errors reduce surface accuracy
Solution Approach 1:
The mesh surface is pre-stretched and pre-positioned on the support structure before final assembly and deployment. This preliminary action allows for pre-adjustment of surface geometry and pre-correction of potential distortions, ensuring high surface accuracy is achieved before the reflector is subjected to operational thermal and mechanical loads, thereby overcoming limitations of conventional manufacturing techniques.
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 process results in a reflector with superior surface accuracy and geometry, suitable for high operational frequencies, reducing mass and acoustical loads while maintaining reflectivity and cross-polarization performance.
Implementation Method 1
placing the reflector surface on a mold includes tensioning the mesh on a concave mold that replicates the desired shape of the reflector surface
Data Source
AI summary
A reflector antenna, preferably a fixed mesh reflector antenna, and a process for manufacturing the reflector antenna, is disclosed that includes forming a support structure, placing a reflector surface on a mold, attaching the support structure to the reflector surface, measuring the geometry of the reflector surface, adjusting the surface geometry of the reflector if appropriate to obtain improved accuracy for the reflector surface, and fixedly connecting the support structure and the reflector surface. In an embodiment, the antenna reflector system includes a mesh reflector surface, a plurality of spline support elements, a plurality of splines connected to the reflector surface, and a plurality of adjustable spline supports attachable to the spline support elements and the splines, wherein the adjustable spline supports are adjustably repositionable with respect to the spline support elements, and also fixedly connectable to the spline support elements.