Corrugated Flexible Waveguide for Satellite RF Systems
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Solution Overview
Problem
Conventional waveguides, both rigid and semi-flexible, face challenges in complex satellite systems due to high complexity in connections, mechanical fatigue, and thermo-elastic displacements, leading to difficulties in accommodating multiple signal paths and supporting structures, especially in multi-beam antennas where many waveguide connections are required.
Innovation Solution
The design of an elongate flexible waveguide section with both longitudinal and circumferential corrugations, featuring sinusoidal, triangular, or square patterns, which enhances flexibility and reduces stress concentration, allowing for compact configurations and increased endurance by accommodating thermo-elastic displacements and repetitive bending without mechanical fatigue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rigid waveguides are used to ensure structural stability, then strength is improved, but flexibility and adaptability deteriorate
Solution Approach 1:
The waveguide employs a corrugated membrane structure that acts as a flexible shell, allowing the waveguide to bend and deform while maintaining its electromagnetic wave guiding function. The corrugations enable the membrane to flex without compromising structural integrity, resolving the contradiction between rigidity and flexibility.
Solution Approach 2:
The waveguide is divided into multiple segments including rigid sections and flexible corrugated sections. This segmentation allows different parts of the waveguide to serve different functions - rigid sections provide structural stability while corrugated sections provide flexibility and adaptability.
2Adaptability or versatility
If conventional semi-flexible waveguides are used to improve flexibility, then adaptability is improved, but mechanical fatigue and endurance deteriorate
Solution Approach 1:
The corrugated membrane structure provides flexible deformation capability while the distributed corrugation pattern disperses mechanical stresses, preventing stress concentration that leads to fatigue. This allows the waveguide to withstand repeated bending cycles without mechanical failure.
Solution Approach 2:
The corrugated structure acts as a cushioning mechanism that absorbs and distributes mechanical stresses before they can cause damage. The corrugations deform elastically to cushion against thermal expansion forces and mechanical vibrations, preventing fatigue damage.
3Adaptability or versatility
If long waveguides are used to accommodate complex routing, then adaptability is improved, but device complexity and volume increase
Solution Approach 1:
The flexible corrugated membrane allows the waveguide to be routed through complex three-dimensional paths without requiring multiple rigid sections, connectors, or support structures. The single continuous flexible structure adapts to complex routing requirements while maintaining simplicity.
4Device complexity
If unsupported lengths of waveguide are increased to reduce support structure complexity, then device complexity decreases, but reliability deteriorates due to vibrations
Solution Approach 1:
The corrugated membrane structure inherently dampens vibrations through its flexible geometry. The corrugations act as vibration isolators, converting vibrational energy into small local deformations that dissipate energy, thereby maintaining reliability over long unsupported lengths without additional support structures.
5Adaptability or versatility
If waveguides are made more flexible to absorb thermo-elastic displacements, then adaptability is improved, but the length required increases the volume
Solution Approach 1:
The corrugated membrane structure provides high flexibility in a compact form. The corrugations enable large displacement absorption capacity within a short length, as the corrugated geometry can expand and contract significantly without requiring proportional increases in overall waveguide length.
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 achieves greater flexibility and endurance, enabling a higher number of connections in compact volumes, reducing mass and improving resistance to mechanical loading, while maintaining RF signal quality and extending the waveguide's lifespan through reduced stress and optimized displacement functions.
Implementation Method 1
The waveguide contains corrugations in its wall, which accommodate bending of the waveguide by facilitating stretching of the waveguide wall at the outside of a bend, and compression of the waveguide wall at the inside of a bend
Implementation Method 2
since the antenna typically runs much hotter than the spacecraft platform or payload there is a lot of differential thermal expansion across the interface between the antenna and the payload or platform, which results in enforced displacement on the waveguides
Data Source
AI summary
An elongate flexible waveguide section for radio frequency signals is provided, wherein the waveguide section is corrugated in the longitudinal direction, and the waveguide section is at least partially corrugated in a circumferential direction perpendicular to the longitudinal direction. Also provided is an apparatus for connecting a VHTS antenna system to a spacecraft.