Shape-Memory Membrane Antenna for Compact Stow and Large Deployment
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Solution Overview
Problem
Conventional stowable antennas require large areas for effective RF wave collection, which poses challenges in compacting them for space deployment while maintaining sensitivity and resolution, as they need to be folded into a small volume and then deployed accurately in space without additional weight or space for inflation components.
Innovation Solution
The use of shape memory composite materials in support structures and reflector surfaces allows for a compact stowed configuration that deploys to a larger volume, utilizing flexible membranes and ribs to maintain a parabolic shape for efficient RF signal collection, with the ability to flex and return to a remembered configuration for storage and deployment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional rigid stowable antennas are used, then the antenna can be folded into a compact configuration, but the structure requires pre-formed rigid shapes and discrete locking positions that increase device complexity
Solution Approach 1:
The patent applies parameter changes by transitioning the support structure from a rigid state to a flexible state during deployment. The flexible support structure changes its mechanical properties, allowing it to be compacted into a small volume for launch and then deployed to form a large parabolic antenna in space, resolving the contradiction between compact stowed volume and deployment complexity
Solution Approach 2:
The patent uses composite materials combining flexible support structures with reflective surfaces. This composite approach allows the antenna to maintain structural integrity while flexible, enabling compact stowing without requiring complex rigid folding mechanisms and discrete locking positions
2Area of stationary object
If inflatable structures are used, then the antenna can achieve large area without pre-formed rigid shapes, but additional components for storing and applying inflation gas increase weight and volume
Solution Approach 1:
The patent extracts the inflation system from the antenna deployment mechanism. Instead of using inflatable structures that require gas storage tanks and delivery systems, the invention uses a flexible support structure that deploys passively or through minimal actuation, removing the heavy inflation components while maintaining large antenna area capability
Solution Approach 2:
The flexible support structure is designed to deploy automatically or through minimal actuation without requiring external inflation gas. The structure itself provides the deployment mechanism through its flexible nature, eliminating the need for separate inflation systems and reducing overall weight
3Volume of moving object
If the antenna is made compact for space deployment, then the stowed volume is reduced, but maintaining large aperture diameter for RF wave collection becomes difficult
Solution Approach 1:
The patent applies dynamics by designing the antenna as a flexible, deployable structure rather than a rigid fixed-form antenna. The flexible support structure allows the antenna to transition from a compact stowed configuration to a fully deployed large-aperture configuration in space, enabling both small launch volume and large operational aperture area
Solution Approach 2:
The patent utilizes dimensional transformation by folding the antenna structure into a compact form for launch and then unfolding it to achieve a large aperture in three-dimensional space. The flexible support structure enables this dimensional transition, allowing the antenna to occupy minimal volume during transport and expand to a large parabolic surface for RF collection
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
This design enables compact, lightweight antennas with high gain and efficiency, capable of deploying to large aperture diameters, such as tens of meters, while minimizing mass and maintaining antenna performance across various thermal conditions.
Implementation Method 1
the support structure and the reflector surface may comprise a shape memory composite material that permits the antenna to collapse under imposition of an outside force in a non-structured fashion; the remembered or biased configuration may be a deployed configuration in which the antenna is configured for use as an RF reflector
Data Source
AI summary
Exemplary embodiments are described herein for compactable antennas and methods of making such an antenna. Exemplary compactable antennas include a support structure and a reflector surface. The support structure may directly or indirectly define the reflector shape. Exemplary embodiments comprise deployable support structures to permit the compactable antenna to have a smaller volume stowed configuration and a larger volume deployed configuration.