Reconfigurable Metasurface Reflection Phase Control for Wide-Angle Steering
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Solution Overview
Problem
Existing anomalous reflectors, such as leaky wave antennas, are not easily reconfigurable and have limited angle separation between incidence and reflection, making them inefficient for wide-angle, low-profile, and low-cost electromagnetic wave reflections in advanced cellular communications.
Innovation Solution
A device comprising a metasurface with an array of electromagnetic unit cells and a controller that adjusts the reflection phase of each unit cell in a supercell to control the angle of reflection of electromagnetic waves over a wide separation angle, utilizing phase holograms and artificially engineered structures for rapid reconfiguration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If leaky wave antenna is used for anomalous reflection, then directive power transfer is achieved, but reconfigurability is poor and angle separation is limited to 70°
Solution Approach 1:
The patent implements dynamic reconfigurability by using independently controllable unit cells with adjustable reflection phases. Each unit cell can be individually tuned to change the overall reflection characteristics of the metasurface, enabling wide-angle anomalous reflection (up to 120° separation) and easy reconfiguration without complex mathematical computations. This dynamic control is achieved through programmable phase modulation of each unit cell element.
2Adaptability or versatility
If metasurface with controlled phase hologram is used, then wide-angle anomalous reflection is achieved, but manufacturing precision requirements increase
Solution Approach 1:
The patent divides the metasurface into discrete unit cells arranged in a grid pattern, where each unit cell can be independently controlled. This segmentation allows the complex phase hologram to be implemented through simple, identical repeating elements with binary or multi-state phase control. The segmentation approach reduces manufacturing precision requirements by using standardized, easily fabricatable unit cells rather than continuously varying complex structures.
Solution Approach 2:
The patent implements local quality by assigning different reflection phases to different unit cells based on the desired phase hologram pattern. Each unit cell's reflection phase is locally adjusted according to its position in the grid, creating the overall anomalous reflection behavior. This local control approach allows wide-angle reflection with simple, uniformly manufactured unit cells, reducing global manufacturing precision requirements.
3Adaptability or versatility
If large number of unit cells are used to achieve wide separation angle, then reflection control is improved, but device area increases
Solution Approach 1:
The patent achieves wide-angle anomalous reflection by changing the reflection phase parameter of each unit cell according to a calculated phase hologram. This parameter modulation approach allows control of reflection direction and angle without increasing the physical size of the unit cells or requiring a larger metasurface area. The phase parameter control enables compact designs with effective wide-angle reflection capability.
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 controllable and anomalous reflection of electromagnetic waves over a wide separation angle of at least 120°, improving spectral and power efficiency in wireless communications without increasing power consumption, and allowing for rapid reconfiguration and low-cost deployment.
Implementation Method 1
devices and methods for controllably reflecting electromagnetic waves
Implementation Method 2
controlling a reflection phase of each unit cell of a supercell of the metasurface
Data Source
AI summary
A device for controllably reflecting electromagnetic (EM) waves is provided. The device includes a metasurface having an array of electromagnetic unit cells. The device further includes a controller for controlling, based on an angle of incidence of the EM waves relative to the metasurface and based on a desired anomalous angle of reflection of the EM waves relative to the metasurface, a reflection phase of each unit cell of a supercell of the metasurface to control an angle of reflection of the EM waves relative to the metasurface to be the desired anomalous angle of reflection. The supercell consists of one or more of the unit cells, and a size (D) of the supercell in a direction of a plane of propagation of the EM waves is at least 2λ, wherein λ is a wavelength of the EM waves.