Foldable Deployable RF Waveguide Using Shape Memory Composite
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Solution Overview
Problem
Conventional satellite waveguides are rigid and cannot be folded without significant loss of electrical transmission efficiency, posing challenges for minimizing launch volume and maintaining performance during deployment.
Innovation Solution
A foldable and deployable RF waveguide made of silicone-based shape-memory composite materials, such as carbon fiber reinforced silicone (CFRS) or graphite with silicone, which maintains low signal loss (<0.5 dB) at Ku and Ka bands and can reduce volume by up to 50% when folded, restoring its original shape with minimal deformation upon deployment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional rigid waveguides are used, then electrical transmission efficiency is maintained, but volume cannot be reduced for launch
Solution Approach 1:
The waveguide material undergoes a parameter change from rigid to flexible through the use of shape memory alloy, allowing the waveguide to be folded into a compact configuration for launch while maintaining its structural integrity and electrical transmission properties when deployed
Solution Approach 2:
The waveguide is constructed using composite materials including shape memory alloy and flexible substrates, combining the electrical conductivity needed for RF transmission with the mechanical flexibility required for folding and deployment
2Volume of moving object
If rigid waveguides are folded, then volume is reduced, but electrical transmission efficiency is significantly lost
Solution Approach 1:
The waveguide transitions from a static rigid structure to a dynamic flexible structure that can adapt its configuration, remaining folded during launch and automatically deploying to its operational shape in orbit, thereby maintaining low signal loss in both states
Solution Approach 2:
The shape memory alloy material changes its physical parameters (rigidity, shape) in response to temperature or stress changes, allowing the waveguide to maintain its folded configuration during launch and then revert to its original operational shape in space, preserving electrical transmission efficiency
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 efficient RF signal transmission with minimal volume occupation during launch and deployment, maintaining performance with negligible deformation and signal loss, thus enhancing satellite usability and commercial efficiency.
Implementation Method 1
silicone based shape memory composite carbon fiber reinforced silicone (CFRS)
Data Source
AI summary
A foldable and deployable assembly for use to transfer RF signals comprises a RF transmitter/receiver adapted to operate in the RF range S and up, a transmit/receive horn unit to attach the assembly to an antenna operable in the RF range S and up and a foldable/deployable RF waveguide connected between the RF transmitter/receiver and the transmit/receive horn and operable in the RF range of S and up, the waveguide is formed as a hollow elongated piece made of at least one of silicone based shape memory composite carbon fiber reinforced silicone (CFRS) and graphite with silicone.