Deployable Conical Space Antenna for CubeSat Volume Constraints
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Solution Overview
Problem
Small satellites, particularly CubeSats, face challenges in accommodating high-performance antennas due to size constraints, especially at lower L-band and S-band frequencies, which are difficult to implement and deploy effectively within the limited volume of these miniaturized platforms.
Innovation Solution
A deployable antenna system comprising a ground plane and a flexible antenna with sinuous arms, which transitions from a flat stored configuration to a conical deployed configuration using an actuator, such as an inflatable membrane or circumferential ring support, allowing for compact storage and efficient deployment in space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-performance wideband antennas are designed for L-band and S-band frequencies, then communication performance is improved, but antenna volume increases making it difficult to fit in small satellites
Solution Approach 1:
The antenna is designed with a deployable structure that transitions from a compact flat configuration during launch to a large conical configuration in orbit. This dynamic transformation allows the antenna to achieve its full operational size and performance characteristics only when needed, resolving the contradiction between requiring large antenna volume for performance and needing compact volume for launch constraints.
Solution Approach 2:
The flat antenna structure is nested within the limited satellite volume during launch, similar to how smaller objects are placed inside larger containers. The antenna arms are folded flat against the satellite body, allowing the large-area antenna to be contained within the small satellite form factor, then deployed to full size in orbit.
2Volume of moving object
If antennas are designed for higher frequencies (20 GHz and above), then antenna size is reduced, but implementation in small satellites remains difficult due to volume constraints
Solution Approach 1:
The deployable mechanism allows the antenna to achieve its operational configuration in orbit, making implementation in small satellites feasible. The dynamic deployment capability means the antenna can be manufactured in a compact state for integration into small satellites, then transformed to its functional state after launch, reducing implementation difficulty while maintaining performance.
3Volume of moving object
If compact stowage is implemented to fit within launch vehicle payload fairings, then launch compatibility is improved, but antenna deployment becomes more challenging
Solution Approach 1:
The antenna employs a dynamic deployment mechanism that transforms from a compact flat stowage configuration to a large conical operational configuration. This dynamic capability allows the antenna to meet both the compact stowage requirement for launch vehicle compatibility and the large operational size requirement for antenna performance, while the deployment mechanism itself becomes the solution to the complexity challenge.
Solution Approach 2:
The deployment mechanism is designed to automatically transition the antenna from its flat stowage configuration to its conical operational configuration using stored mechanical energy or simple actuation, reducing the need for complex control systems and external assistance during deployment.
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 the deployment of high-performance antennas with wider bandwidth and multi-polarization capabilities within the limited space of small satellites, facilitating effective communication in various frequency bands while maintaining compactness during launch and expanding orthogonally for optimal operation.
Implementation Method 1
an actuator, such as an inflatable membrane or circumferential ring support, allowing for compact storage and efficient deployment in space
Data Source
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AI summary
An outer space deployable antenna may include a ground plane and a flexible antenna coupled to the ground plane and moveable between a flat stored configuration and a conical deployed configuration. The flexible antenna may include a dielectric layer and a plurality of antenna arms. The flexible antenna may have a circular shape with a circular sector notch in the flat stored configuration that closes in the conical deployed configuration.