Twist-Aligned Intelligent Reflecting Surface for Faster LC Response
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Solution Overview
Problem
Conventional intelligent reflecting surfaces with liquid crystal layers have slow response speeds due to homogeneous orientation of liquid crystal molecules, which limits their effectiveness in controlling radio wave reflection.
Innovation Solution
An intelligent reflecting surface design incorporating a liquid crystal layer with twist alignment, controlled by alignment films and substrates spaced at least 10 μm apart, with a chiral pitch and distance relationship that enhances response speed by stabilizing twist angles between 90 and 360 degrees.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If liquid crystal molecules are arranged in homogeneous orientation, then the liquid crystal layer can be made thinner, but the response speed becomes slow
Solution Approach 1:
The patent changes the orientation parameter of liquid crystal molecules from homogeneous to twist alignment, and optimizes the relationship between chiral pitch p and distance d (d≤p) to achieve fast response speed while maintaining practical layer thickness
Solution Approach 2:
The patent uses a composite structure including liquid crystal molecules with twist alignment, chiral agents, and specific alignment films to create a system that achieves both fast response and appropriate thickness for radio wave reflection applications
2Speed
If the distance between substrates is increased to allow twist alignment, then response speed improves, but the device complexity increases
Solution Approach 1:
The patent optimizes the distance d between substrates to be greater than or equal to 10 μm and establishes the relationship d≤p (where p is chiral pitch), achieving fast response through twist alignment while controlling structural complexity through parameter optimization
Solution Approach 2:
The patent introduces alignment films and chiral agents as intermediary elements that enable twist alignment of liquid crystal molecules between substrates, facilitating the desired orientation control without requiring complex mechanical structures
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 design significantly increases the response speed of the liquid crystal layer, allowing for rapid control of radio wave reflection direction across various frequency bands.
Implementation Method 1
The phase can be changed by adjusting the dielectric constant of the liquid crystal layer for each antenna element and superposing the reflected waves
Implementation Method 2
The phase can be changed by adjusting the dielectric constant of the liquid crystal layer
Implementation Method 3
a liquid crystal layer including liquid crystal molecules with a twist alignment between the first alignment film and the second alignment film
Data Source
AI summary
An intelligent reflecting surface invention includes a first substrate, a plurality of patch electrodes on the first substrate, a first alignment film covering the plurality of patch electrodes, a second substrate, a plurality of ground electrodes on the second substrate, a second alignment film covering the plurality of ground electrodes, and a liquid crystal layer including liquid crystal molecules with a twist alignment between the first alignment film and the second alignment film. A distance (d) between the first substrate and the second substrate is greater than or equal to 10 μm. A chiral pitch (p) of the liquid crystal layer and the distance (d) satisfy a relational equation d≤p<4d/3.