Deployable AMC Antenna With Inflate-to-Latch Spacing Control
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Solution Overview
Problem
Traditional antennas over ground planes require a quarter wavelength spacing, resulting in a thick profile, especially at low frequencies, and artificial magnetic conductor (AMC) antennas with stiff structures are cumbersome for large aperture antennas below 1 GHz.
Innovation Solution
An AMC antenna apparatus with a flexible ground plane, a frequency selective surface layer, and an inflatable bladder system that transitions from an unlatched to a latched state to maintain a predetermined distance between the conductive base surface and the FSS layer, allowing for compact stowage and efficient deployment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional quarter wavelength spacing is used, then directivity performance is improved, but antenna thickness increases
Solution Approach 1:
The patent changes the electrical parameters of the ground plane by using an artificial magnetic conductor (AMC) structure with frequency selective surface (FSS) patches and flexible conductors. This transforms the ground plane's electromagnetic characteristics to achieve magnetic wall boundary conditions, enabling reduced spacing while maintaining directivity performance.
Solution Approach 2:
The patent employs a composite structure combining flexible conductors, low loss dielectric material, and FSS patches to create an AMC ground plane. This composite design enables the ground plane to exhibit magnetic conductor properties at specific frequencies, allowing reduced antenna thickness while preserving radiating performance.
2Length of stationary object
If AMC ground plane with FSS is used, then antenna thickness is reduced, but structural flexibility deteriorates
Solution Approach 1:
The patent implements a deployable structure that transitions from a compact stowed configuration to an expanded operational configuration. The ground plane elements are designed to be flexible and movable, allowing the antenna to be easily deployed and stowed while maintaining structural integrity and electrical performance in the operational state.
Solution Approach 2:
The patent divides the ground plane into discrete FSS patches connected by flexible conductors, allowing each element to move independently during deployment. This segmentation enables the structure to be compact when stowed while maintaining the required electrical connections and geometric relationships when deployed.
3Manufacturing precision
If fixed spacing structure is used, then manufacturing precision is improved, but adaptability deteriorates
Solution Approach 1:
The patent employs a dynamic deployment mechanism that allows the antenna to transition between stowed and operational states. The spacing between the radiating element and ground plane is maintained with high precision when deployed through mechanical constraints and elastic forces, while allowing compact configuration during storage and transport.
Solution Approach 2:
The patent utilizes elastic forces from the flexible conductors and dielectric material to automatically maintain the predetermined spacing between ground plane elements when deployed. The structure self-regulates to achieve the correct geometric relationships without requiring active control mechanisms, ensuring manufacturing precision is maintained while enabling deployment adaptability.
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 solution enables a thinner, more portable AMC antenna with comparable directivity performance to traditional antennas, facilitating easier transportation and deployment while maintaining efficient antenna performance.
Implementation Method 1
An inflatable bladder system is disposed between the base layer and the FSS layer and configured to receive a gas input during deployment of the antenna apparatus and inflate to produce force sufficient to cause the latch mechanism to transition from an unlatched state to a latched state
Data Source
AI summary
An AMC antenna apparatus includes a ground plane and a flexible antenna element layer above the ground plane. The ground plane includes a conductive base surface, a plurality of flexible conductors, and a frequency selective surface (FSS) layer above the base surface, where the FSS layer includes a plurality of conductive patches separated from one another. Each of the flexible conductors electrically connects one of the conductive patches to the base surface. A latch mechanism is arranged between the base layer and the FSS layer. An inflatable bladder system between the base layer and the FSS layer is configured to receive a gas input during deployment of the antenna apparatus and inflate to produce force sufficient to cause the latch mechanism to transition from an unlatched state to a latched state in which the conductive base surface is fixedly separated from the FSS layer at a predetermined distance.