Acoustically Permeable Metalized Laminate Antenna Reflector
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Solution Overview
Problem
Spacecraft RF antenna reflectors face challenges in achieving excellent RF performance, compatibility with acoustic launch environmental loads, and meeting stringent mass and cost objectives while enduring temperature variations and solar radiation.
Innovation Solution
A laminated structure comprising a first layer of acoustically permeable, nonwoven metallized fiber matte and a second layer of acoustically permeable, open weave fabric, which can be co-cured or bonded, with a honeycomb core optionally sandwiched between, to form a lightweight and cost-effective RF antenna reflector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a traditional solid or closed-cell structure is used for the antenna reflector, then structural strength and rigidity are improved, but acoustic permeability deteriorates causing excessive acoustic launch loads
Solution Approach 1:
The patent employs an open-cell foam core material with high acoustic permeability that allows acoustic energy to pass through during launch, significantly reducing acoustic loads on the antenna reflector. The porous structure enables acoustic waves to penetrate the material rather than reflecting off a solid surface, thereby protecting the spacecraft during launch while maintaining structural integrity.
Solution Approach 2:
The antenna reflector uses a composite structure combining an open-cell foam core with outer skin layers. This composite design integrates the acoustic permeability of the foam core with the structural strength and RF reflectivity of the outer layers, achieving both acoustic load reduction and mechanical strength requirements simultaneously.
2Object-affected harmful factors
If acoustic permeability is increased to reduce acoustic launch loads, then compatibility with acoustic launch loads is improved, but structural strength and rigidity deteriorate
Solution Approach 1:
The composite structure combines an acoustically permeable open-cell foam core with strong outer skin layers. The foam core provides acoustic permeability to reduce launch loads, while the outer skins provide structural strength and rigidity. This composite approach allows each layer to perform its specialized function, resolving the contradiction between acoustic permeability and structural strength.
Solution Approach 2:
Different regions of the antenna reflector structure have different properties optimized for their specific functions. The core region uses highly permeable open-cell foam for acoustic load reduction, while the outer surface layers use dense, strong materials for structural support and RF reflectivity. This local differentiation of material properties allows simultaneous optimization of acoustic performance and structural strength.
3Weight of moving object
If mass is reduced to meet stringent mass objectives, then cost and mass objectives are improved, but structural strength and ability to withstand launch loads deteriorates
Solution Approach 1:
The antenna reflector employs thin outer skin layers that provide sufficient structural strength and RF reflectivity while minimizing mass. The thin films are strategically designed to provide the necessary structural support without the excessive mass of thicker traditional structures, achieving mass reduction while maintaining strength through optimized thickness and material selection.
Solution Approach 2:
The composite structure with open-cell foam core and thin outer skins achieves high strength-to-weight ratio. The lightweight foam core provides volume and structural support with minimal mass, while the thin outer layers provide necessary strength and functionality. This composite approach enables mass reduction while maintaining the structural strength required to withstand launch loads.
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
The laminated structure achieves excellent RF performance, compatibility with acoustic launch loads, and reduced mass and cost, maintaining high acoustic permeability and thermal stability, with minimal impact on the reflector's performance under varying environmental conditions.
Implementation Method 1
The first layer includes an electrically conductive and electrically reflective front surface
Implementation Method 2
a first layer of acoustically permeable, nonwoven metallized fiber matte and a second layer of acoustically permeable, open weave fabric
Data Source
AI summary
An antenna reflector includes a laminated structure including a first layer and a second layer, where the first layer has an electrically conductive and electrically reflective front surface and includes a nonwoven metallized fiber matte and the second layer includes an open weave fabric. The laminated structure is acoustically permeable. In some implementations, a laminated structure is formed by co-curing the first layer and the second layer.