Liquid Crystal Composition for High-Frequency Electromagnetic Wave Control
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Solution Overview
Problem
Conventional liquid crystal compositions used in electromagnetic wave control elements are insufficient in terms of characteristics such as high-frequency control, exhibiting high insertion loss and insufficient phase shift, and require optimization for improved performance in controlling electromagnetic waves in the 1 GHz to 10 THz frequency range.
Innovation Solution
A liquid crystal composition containing specific compounds with a defined structure, which provides a large dielectric constant anisotropy, small dielectric loss tangent, and excellent temperature stability, enabling efficient electromagnetic wave control with a wide temperature range and low viscosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional liquid crystal compositions are used in electromagnetic wave control elements, then the elements can be constructed with simple structure, but the insertion loss is high and phase shift control is insufficient
Solution Approach 1:
The patent applies parameter changes by carefully selecting and combining liquid crystal compounds with specific molecular structures (Formula 1) that have optimized dielectric constant anisotropy and refractive index anisotropy parameters. The composition contains compounds where R1 is hydrogen, halogen, or alkyl; ring A1 is specific cyclic structures; and L11-L16, Y11, Y12 are specific substituents. This parameter optimization enables large phase shift control while maintaining low insertion loss at high frequencies
Solution Approach 2:
The patent uses composite materials by formulating a liquid crystal composition containing multiple compounds with different molecular structures (Formula 1, Formula 2, Formula 3, Formula 4) in specific weight ratios. This composite approach combines the advantages of different compounds to achieve both low dielectric loss tangent and high dielectric constant anisotropy, resolving the contradiction between low insertion loss and effective phase shift control
2Power
If liquid crystal composition is used for high-frequency electromagnetic wave control (1 GHz to 10 THz), then the dielectric constant anisotropy can be utilized for phase control, but the dielectric loss tangent increases causing energy absorption
Solution Approach 1:
The patent applies parameter changes by selecting liquid crystal compounds with specific structural parameters (Formula 1) that maintain low dielectric loss tangent even at high frequencies up to 10 THz. The molecular structure parameters including R1 groups, ring A1 structures, and L11-L16 substituents are optimized to minimize energy absorption while preserving dielectric constant anisotropy for effective phase control power
3Reliability
If liquid crystal composition has large dielectric constant anisotropy for effective phase control, then the phase control performance is improved, but the viscosity increases reducing response speed
Solution Approach 1:
The patent applies parameter changes by optimizing the molecular structure parameters of liquid crystal compounds (Formula 1) to achieve the right balance between dielectric constant anisotropy and viscosity. The specific R1, ring A1, L11-L16, and Y11-Y12 parameters are selected to provide large phase control performance while maintaining acceptable viscosity for adequate response speed
Solution Approach 2:
The patent uses composite materials by combining multiple liquid crystal compounds (Formula 1, Formula 2, Formula 3, Formula 4) in specific weight ratios. This composite formulation balances the viscosity and dielectric constant anisotropy characteristics of individual compounds, achieving both effective phase control performance and acceptable response speed
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 composition achieves effective electromagnetic wave control with a large dielectric constant anisotropy and low dielectric loss tangent, supporting high-frequency applications and reducing energy absorption, thereby enhancing the efficiency of electromagnetic wave transmission.
Implementation Method 1
In a liquid crystal composition having dielectric constant anisotropy, the dielectric constants in a perpendicular direction and a horizontal direction with respect to the orientation direction of the liquid crystal composition are different
Implementation Method 2
Orientation polarization is polarization that accompanies the orientation of the dipole moment, and as described above, it relaxes at a frequency of about several 100 kHz to several 100 MHz
Implementation Method 3
The mechanisms by which dielectric polarization occurs can be roughly divided into three: electronic polarization, ionic polarization, and orientation polarization
Implementation Method 4
the larger the refractive index anisotropy (Δn) in visible light caused by electronic polarization, the greater the dielectric constant anisotropy (Δε) in a high-frequency region is also thought to become
Data Source
AI summary
A liquid crystal composition as a material used for elements for controlling electromagnetic wave signals in a frequency range of 1 GHz to 10 THz, and an element containing this composition are provided. In the liquid crystal composition, a characteristic balance is excellent, and at least one of characteristics of a wide temperature range of a nematic phase, a large refractive index anisotropy in a frequency region used for control, and a small dielectric loss tangent (tan δ) is satisfied. A liquid crystal composition containing at least one compound selected from compounds represented by Formula (1) is provided:wherein R1 is an alkyl having 1 to 12 carbon atoms; ring A1 is 1,4-phenylene; L11, L13, L14, L16, Y11, and Y12 are each hydrogen; L12 is fluorine; and L15 is methyl.