Deployable AMC Antenna With Inflate-to-Latch Thickness Control
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Solution Overview
Problem
Traditional antennas over ground planes with a quarter wavelength spacing result in thick profiles, especially at low frequencies, and artificial magnetic conductor (AMC) antennas with stiff structures are cumbersome for transport and deployment.
Innovation Solution
An AMC antenna apparatus featuring a flexible ground plane with a conductive base surface, a frequency selective surface (FSS) layer, and flexible conductors, along with an inflatable bladder system and latch mechanism, allows for compact stowage and rapid deployment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional quarter wavelength spacing is used between radiating element and ground plane, then directivity performance is improved, but antenna thickness increases significantly
Solution Approach 1:
The patent changes the electromagnetic boundary condition parameters by introducing an artificial magnetic conductor (AMC) ground plane with specific unit cell geometries and spacing, transforming the traditional quarter-wavelength resonance condition into a sub-wavelength resonant condition that achieves similar directivity with reduced thickness
Solution Approach 2:
The patent employs composite material structures including dielectric layers with specific permittivity values, metallic ground plane elements, and AMC unit cells arranged in composite configurations to achieve the desired electromagnetic properties for both performance and thickness reduction
2Length of moving object
If AMC ground plane with frequency selective surface is used, then antenna thickness is reduced, but structural stiffness increases making transport difficult
Solution Approach 1:
The patent introduces deployable mechanical structures including telescopic support elements and articulation joints that allow the antenna to transition between a compact transport configuration and a deployed operational configuration, making the structurally stiff AMC antenna transportable
Solution Approach 2:
The patent divides the antenna structure into modular segments including separate ground plane sections, radiating element modules, and collapsible support structures that can be compacted for transport and assembled for operation
3Ease of operation
If flexible conductors and collapsible ground plane are used, then transportability is improved, but deployment complexity increases
Solution Approach 1:
The patent employs spring-loaded expansion elements and elastic biasing mechanisms that automatically drive the deployment process, allowing the antenna to self-deploy from its compact to operational configuration without complex active control systems
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 that maintains directivity performance while allowing for efficient deployment and stowage, addressing the issues of thickness and transportability in traditional antennas.
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.