Endless Pantograph Deployable Structure for Reflectarray Antennas
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Solution Overview
Problem
Existing deployable high-gain antennas for space-related applications face challenges in compact deployment mechanisms, high part counts, and reliability issues, particularly with reflectarray antennas, which require a compact stowed state and efficient deployment in space-constrained volumes.
Innovation Solution
A deployable structure featuring a flexible reflectarray and an endless pantograph deployment mechanism with an energy-providing device, allowing the reflectarray to transition from a folded to an unfolded state, utilizing a polygonal or circular pantograph design with sub-pantographs and vertex structures to increase perimeter length and maintain stiffness, along with deployable tapes for positioning the reflectarray and feed antenna.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a deployable reflectarray antenna is designed for space applications, then the antenna can transition from a compact stowed state to a deployed functional state, but the deployment mechanism increases device complexity and part count
Solution Approach 1:
The patent employs a deployable structure that transitions from a static compact stowed configuration to a dynamic deployed functional configuration. The reflectarray elements are arranged in a deployable framework that can change its spatial configuration, allowing the antenna to expand from a small stowed volume to a large deployed aperture while maintaining structural integrity through mechanical linkages and tensioning systems
Solution Approach 2:
The reflectarray antenna is divided into multiple discrete elements that can be independently positioned and configured. These segmented elements are arranged in a deployable framework that allows compact stowing and controlled deployment. The segmentation enables the structure to reduce volume when stowed while maintaining the ability to form a functional reflectarray surface when deployed
2Reliability
If the reflectarray elements are arranged to function in a deployed state, then the antenna achieves high-gain performance, but the structure occupies a large volume in the deployed state
Solution Approach 1:
The antenna structure is designed to dynamically change its volume based on operational requirements. In the deployed state, the reflectarray elements are arranged in a configuration that provides the necessary aperture area for high-gain performance. In the stowed state, the same elements are compacted into a small volume for launch or storage, demonstrating dynamic adaptability between conflicting volume and performance requirements
3Volume of moving object
If a compact stowed state is achieved for space applications, then the antenna fits within constrained launch volumes, but the deployment mechanism requires high reliability to ensure successful transition
Solution Approach 1:
The deployable structure incorporates self-tensioning mechanisms and self-aligning features that reduce the need for complex external deployment systems. The reflectarray elements and framework are designed to automatically tension and stabilize themselves during deployment, using the mechanical properties of the structure and materials to ensure reliable transition from stowed to deployed state without requiring additional active control systems
Solution Approach 2:
The deployment mechanism includes pre-positioned限位 structures, tensioning elements, and alignment features that prevent deployment errors before they occur. These beforehand cushioning elements ensure that the transition from stowed to deployed state follows a predetermined reliable path, protecting against mechanical failures or misalignments that could compromise deployment reliability
Data Source
AI summary
A deployable structure for use in establishing a reflectarray antenna is provided that includes a flexible reflectarray and a deployment structure that includes an endless pantograph for deploying the flexible reflectarray from a folded, undeployed state towards a deployed state in which the flexible reflectarray is substantially planar. In a particular embodiment, the deployment structure includes a plurality of tapes that engage the endless pantograph and are used to establish a positional relationship between the deployed reflectarray and another component of the reflectarray antenna.