Intelligent Reflecting Surface Structure for Thin Liquid Crystal Layers
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Solution Overview
Problem
Existing intelligent reflecting surfaces using liquid crystal materials face increased costs and reduced response characteristics due to the need for thicker dielectric layers to achieve desired reflection characteristics.
Innovation Solution
A reflector unit cell design incorporating three dielectric layers with specific dielectric constants and thicknesses, including a liquid crystal layer that is thinner than prior designs, and a configuration that allows for efficient phase and control methods to the reflection characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness of the dielectric layer is increased to achieve desired reflection characteristics, then the reflection performance is improved, but the cost increases and response characteristics are reduced
Solution Approach 1:
The patent changes the dielectric constant parameter of the liquid crystal material to a specific range (2.5 ≤ εr ≤ 3.5) to achieve optimal reflection characteristics with a reduced dielectric layer thickness of 20-30 μm, thereby lowering cost while maintaining performance
Solution Approach 2:
The patent employs a composite structure with multiple dielectric layers (first dielectric layer with liquid crystal, second dielectric layer with different dielectric constant) to achieve enhanced reflection characteristics with thinner overall thickness, resolving the contradiction between performance and cost
2Reliability
If the thickness of the dielectric layer is increased to achieve desired reflection characteristics, then the reflection performance is improved, but the response characteristics are reduced
Solution Approach 1:
By optimizing the dielectric constant to a specific range (2.5 ≤ εr ≤ 3.5) and reducing the dielectric layer thickness to 20-30 μm, the patent achieves both desired reflection characteristics and improved response speed, eliminating the trade-off between these parameters
3Length of stationary object
If the dielectric constant is increased to reduce dielectric layer thickness, then the structure becomes more compact, but the manufacturing precision requirements increase
Solution Approach 1:
The patent specifies an optimal dielectric constant range (2.5 ≤ εr ≤ 3.5) that balances compact structure achievement with manufacturability, avoiding excessively high dielectric constants that would demand impractical manufacturing precision while still enabling reduced layer thickness
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 provides an intelligent reflecting surface with improved radio wave reflection characteristics and reduced cost by optimizing the dielectric layer thickness and maintaining sufficient phase difference.
Implementation Method 1
a phase shifter that utilizes a change in a dielectric constant due to an alignment state of a liquid crystal
Implementation Method 2
the dielectric constant of the first dielectric layer is 2.5 or more and 3.5 or less... a dielectric constant of the second dielectric layer is 2.0 or more and to 4.0 or less
Data Source
AI summary
An intelligent reflecting surface according to an embodiment includes a reflector unit cell including a ground electrode, a first dielectric layer arranged on the ground electrode, a first electrode arranged on the first dielectric layer, a second dielectric layer arranged on the first electrode, and a second electrode arranged on the second dielectric layer and overlapping the first electrode. A dielectric constant of the first dielectric layer is 2.5 or more and 3.5 or less. A thickness of the first dielectric layer is 20 μm or more and 30 μm or less. A dielectric constant of the second dielectric layer is 2.0 or more and to 4.0 or less. A thickness of the second dielectric layer is 10 μm or more and 30 μm or less.