Foldable Reflectarray Antenna for CubeSat Beam Steering
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Solution Overview
Problem
Current high gain antennas for CubeSat missions, such as reflectarrays, are limited to radiating in only one direction, requiring complex and power-intensive beamforming networks for directional steering, which are costly and unreliable for space applications.
Innovation Solution
Deployable arrays with a foldable substrate and actuation systems, such as motors or robotics, that change their electromagnetic behavior by folding, allowing for beam steering and multiple operation states, eliminating the need for electronic feeding networks and reducing complexity and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If beamformers (passive or active networks) are used to steer the beam in different directions, then directional beam steering capability is improved, but device complexity and power consumption increase significantly
Solution Approach 1:
The patent applies the dynamics principle by making the reflectarray structure mechanically reconfigurable through folding mechanisms. The array can transition between different folded states, where each state presents a different effective aperture and beam direction. This mechanical reconfiguration replaces the need for complex electronic beamforming networks, as the physical structure itself determines the radiation pattern in each state.
Solution Approach 2:
The patent employs parameter changes by varying the physical configuration of the reflectarray through folding. By changing the folding state of the substrate, the effective area, shape, and orientation of the antenna array are modified, which directly changes the beam direction and radiation characteristics. This physical parameter change achieves beam steering without requiring complex electronic control networks.
2Adaptability or versatility
If beamformers are used to achieve multiple radiating directions, then adaptability is improved, but power consumption increases
Solution Approach 1:
The mechanically reconfigurable reflectarray uses folding mechanisms to dynamically change its physical configuration. Each folded state corresponds to a specific radiating direction, eliminating the need for continuous power consumption associated with electronic beamforming. The structure transitions between states mechanically, and once in a state, it maintains the beam direction without requiring ongoing power input for active beam control.
Solution Approach 2:
The patent replaces electronic beamforming systems with a mechanical reconfiguration system. Instead of using powered electronic networks to steer beams, the invention uses mechanical folding of the substrate to physically reposition the antenna elements. This substitution of mechanical for electronic systems significantly reduces power consumption while achieving the same adaptability of multiple radiating directions.
3Ease of manufacture
If conventional reflectarrays are used, then low cost and low mass are achieved, but only one pre-defined radiating direction is possible
Solution Approach 1:
The patent applies segmentation by dividing the reflectarray substrate into multiple foldable sections or panels. These segmented sections can be independently folded or reconfigured, allowing the array to transition between different geometric states. Each state provides a different radiating direction, thus achieving versatility while maintaining the simplicity and low cost of the underlying reflectarray structure.
Solution Approach 2:
By introducing mechanical folding capabilities to the conventional reflectarray, the patent transforms a static structure into a dynamic one. The array can now change its physical configuration to achieve multiple radiating directions, while the base reflectarray design remains simple and cost-effective. The dynamic reconfiguration adds versatility without significantly increasing manufacturing complexity or cost.
Data Source
AI summary
Arrays that are deployable and can change their electromagnetic behavior by changing their shape are provided. The arrays can steer the beam using folding techniques and/or can achieve multiple operation states by folding the structure. An array can include a foldable substrate with antenna elements disposed thereon. In a folded state, a first plurality of unit cells is visible from above the array and can be configured to steer in a particular first direction and/or operate at a particular first frequency. In the unfolded state a second plurality of unit cells, and also possibly the first plurality of unit cells, are visible from above the array and can be configured to steer in a particular second direction and/or operate at a particular second frequency.