Deployable Space Antenna Structure Using Shape Memory Composites
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Solution Overview
Problem
Space structures face challenges in balancing strength, deployability, and size, particularly for antennas on small satellites, due to material limitations and environmental conditions in space, leading to compromised beam patterns and logistical issues during launch and deployment.
Innovation Solution
The use of a satellite base structure with a degradable layer and shape memory composite materials that allow for deployment from a stored to a deployed configuration, supported by an envelope that inflates and degrades to reduce mass and interference post-deployment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional rigid antenna structures are used for space deployment, then the antenna can maintain structural strength and reliability, but the antenna size and mass increase exponentially, creating logistical problems for small satellites
Solution Approach 1:
The patent employs thin-film materials and flexible membrane structures to create deployable antenna surfaces that can be packed compactly for launch and then expanded in space. These thin-film structures provide the necessary reflective surface for microwave transmission while minimizing mass, replacing traditional rigid metal panels with lightweight flexible membranes that maintain structural integrity through tension and geometric design.
Solution Approach 2:
The antenna structure is divided into multiple deployable segments or panels that can be folded or rolled for launch and then assembled or expanded in orbit. This segmentation allows the large-area antenna to be transported in a compact configuration while achieving full operational size in space, reducing the initial mass and volume requirements without compromising the final structural strength.
2Length of moving object
If the antenna is made compact for launch, then logistical problems are reduced, but the beam pattern is compromised or narrowed
Solution Approach 1:
The antenna design transitions from a static compact configuration during launch to a dynamic deployed configuration in space. The structure incorporates movable joints, tensioning mechanisms, and adjustable surface elements that allow the antenna to achieve its optimal geometric shape for microwave transmission only after deployment, ensuring high beam pattern quality while maintaining compact stowed dimensions.
Solution Approach 2:
The antenna panels or segments are designed to nest within each other or roll into a compact cylindrical form for launch, similar to a nested doll structure. This nesting arrangement minimizes the stowed volume while preserving the integrity of individual panels, which then assemble or unfold in space to form the large-area structure necessary for high-quality beam patterns.
3Reliability
If stronger materials are used to withstand deployment forces, then the antenna can maintain structural integrity during deployment, but the antenna becomes heavier and larger
Solution Approach 1:
The antenna structure utilizes composite materials that combine lightweight substrates with high-strength reinforcement layers or tensioning elements. These composite constructions provide the necessary mechanical strength to withstand deployment forces and maintain structural integrity in the space environment, while the lightweight base materials keep the overall mass low, avoiding the need for purely heavy-duty materials.
Solution Approach 2:
The deployment mechanism incorporates pre-engineered stress distribution features, such as reinforcement ribs, tensioning cables, or energy-absorbing elements, that are built into the structure before deployment. These features cushion and distribute the forces encountered during deployment, protecting critical components from damage without requiring the entire antenna structure to be made of heavy-duty materials throughout.
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
Enables reliable deployment and maintenance of antenna structures in space while minimizing weight and interference, allowing for efficient transition from a stowed to a deployed configuration with reduced logistical challenges.
Implementation Method 1
The degradable layer may comprise a layer degradable in outer space, such as in contact with atomic oxygen and/or radiation
Implementation Method 2
The degradable layer may comprise a layer degradable in outer space, such as in contact with atomic oxygen and/or radiation
Implementation Method 3
The use of a satellite base structure with a degradable layer and shape memory composite materials that allow for deployment from a stored to a deployed configuration, supported by an envelope that inflates
Implementation Method 4
shape memory composite materials that allow for deployment from a stored to a deployed configuration
Data Source
AI summary
Systems and methods described herein include collapsible and deployable antenna structures. The antenna structures may include any combination of shape memory composites, inflatable envelopes, and/or degradable materials.