Stowable Rigid Panel Reflector for Space Antennas
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Solution Overview
Problem
Reflectors used in RF antennas and solar collectors face performance limitations due to surface roughness issues in mesh reflectors, which are difficult to adjust and maintain, and solid reflectors are not foldable, making them unsuitable for space-based applications with size constraints.
Innovation Solution
A reflector system comprising rigid panels mounted on a centrally-located hub that can be stowed compactly and deployed by a combination of rotational and linear motion, forming a side-by-side configuration to focus electromagnetic energy effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid reflector is used, then electromagnetic energy focusing performance is improved, but the reflector cannot be folded and requires larger storage volume
Solution Approach 1:
The solid reflector is divided into multiple rigid panels that can be independently folded and stored. Each panel maintains its structural integrity and reflective surface quality, while the modular configuration allows compact folding without compromising the overall focusing performance when deployed.
Solution Approach 2:
The reflector system transitions from a static solid structure to a dynamic deployable structure. The rigid panels are connected through joints that enable controlled movement between stowed and deployed configurations, allowing the reflector to change its spatial arrangement while maintaining structural rigidity during operation.
2Volume of moving object
If a wire mesh reflector is used, then storage volume is reduced, but surface roughness exceeds the required 0.010-inch tolerance for high-frequency RF signals
Solution Approach 1:
Instead of using a continuous mesh or a large solid reflector, the system employs multiple discrete rigid panels. Each panel can be manufactured with precise surface tolerances, and when assembled, they form a complete reflector surface that meets the required roughness specifications while allowing compact storage through folding.
Solution Approach 2:
The reflector combines rigid structural elements with precise surface finishes. Each panel uses composite construction that integrates the structural framework with the reflective surface, ensuring both mechanical strength for rigidity and surface quality for high-frequency RF signal performance.
3Reliability
If a solid reflector with aperture greater than 3.5 meters is used, then electromagnetic energy focusing performance is improved, but the reflector cannot fit in standard fairing volumes for space-based applications
Solution Approach 1:
Large aperture reflectors are divided into multiple smaller rigid panels that can be individually packaged within standard fairing volumes. When deployed in space, these panels assemble to form the complete large-aperture reflector, achieving the required optical performance without exceeding launch vehicle constraints.
Solution Approach 2:
The rigid panels are configured to nest within each other during storage, similar to a nested doll structure. This allows the large-aperture reflector to be compacted into a small volume that fits within standard fairings, while maintaining the capability to expand to the full aperture size once deployed.
4Volume of moving object
If a mesh reflector is used, then the reflector can be folded compactly, but hundreds or thousands of positional adjustments are required during assembly and deployment
Solution Approach 1:
The reflector is segmented into rigid panels with pre-defined geometric relationships. Each panel maintains its shape and position relative to others through rigid connections, eliminating the need for numerous individual cable or rod adjustments required in mesh reflectors. Assembly involves simpler alignment and connection operations.
Solution Approach 2:
The deployable structure uses controlled mechanical motion to transition from stowed to deployed configuration. The rigid panels move in predetermined paths through rotational and linear motion, reducing the need for manual adjustments and enabling more predictable, automated deployment sequences.
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 solution allows for high-performance focusing of electromagnetic energy while reducing storage volume, eliminating the need for extensive adjustments and enabling the use of larger aperture solid reflectors in space-based applications.
Implementation Method 1
The panels are configured to translate with a combination of rotational and linear motion
Implementation Method 2
The panels are configured to translate with a combination of rotational and linear motion
Implementation Method 3
Reflectors that focus electromagnetic energy... shaped so as to focus electromagnetic energy at a particular point or area
Data Source
AI summary
Reflector systems (10) comprising a reflector (11) formed from rigid panels (14) mounted on a centrally-located hub (12) are provided. The panels (14) can be stowed in a relatively compact manner in which the panels (14) overlap. The panels (14) can translate with a combination of rotational and linear motion so that the panels (14) become disposed in a side by side relationship, thereby deploying the reflector (11) so that the reflector (11) can focus electromagnetic energy incident thereupon.