Shape Memory Wire AMC Antenna for Thin Portable Deployment
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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 transportation and deployment.
Innovation Solution
An AMC antenna apparatus with a flexible antenna element layer and a ground plane featuring a conductive base surface, frequency selective surface (FSS) layer, and memory metal wires that transition from flexible to rigid states for deployment, allowing the FSS layer to be collapsed for stowage and automatically expand for operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional quarter wavelength spacing is used for antenna over ground plane, then directivity is improved, but antenna thickness increases significantly
Solution Approach 1:
The patent changes the electrical parameters of the ground plane by introducing a frequency selective surface (FSS) layer with specific impedance characteristics. This transforms the ground plane from a simple reflective surface to an artificial magnetic conductor (AMC) with tailored electromagnetic properties, enabling reduced spacing while maintaining directivity
Solution Approach 2:
The patent employs a composite ground plane structure consisting of a conductive base surface, a dielectric layer, and a frequency selective surface layer. This multi-layer composite achieves AMC properties that enable both thin profile and maintained directivity performance
2Length of stationary object
If AMC ground plane with FSS layer is used to reduce thickness, then antenna thickness is improved, but structural stiffness increases making transport difficult
Solution Approach 1:
The patent introduces memory metal wires that can dynamically change their mechanical properties between rigid and flexible states. During operation, the wires maintain a rigid memory-shaped state to preserve FSS spacing, while during stowage, they can be deformed to a flexible non-memory-shaped state enabling compact folding
Solution Approach 2:
The memory metal wires undergo parameter changes in their mechanical state based on temperature or stress conditions, transitioning between rigid operational configuration and flexible stowage configuration, thus resolving the transportability contradiction
3Ease of operation
If memory metal wires are used to enable flexible stowage, then transportability is improved, but structural complexity increases
Solution Approach 1:
The memory metal wires are self-activating components that automatically return to their memory-shaped rigid configuration when released from stowage, without requiring external actuators or complex control systems. The wires self-regulate their structural properties based on thermal or mechanical triggers
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 while allowing for compact stowage and efficient deployment, addressing the thickness and transportability issues of traditional antennas.
Implementation Method 1
The memory metal wires automatically transform from flexible to rigid states when ambient temperature exceeds a threshold
Data Source
AI summary
An artificial magnetic conductor (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 memory metal wires, 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 memory metal wires electrically connects one of the conductive patches to the base surface. Each of the memory metal wires is rigid in a memory-shaped state, causing the FSS layer to be fixedly spaced from the base surface during operation of the AMC antenna apparatus. The memory metal wires are each flexible in a non-memory-shaped state, enabling the FSS layer to be collapsed towards the base surface when the antenna apparatus is stowed.