Liquid Crystal Composition for Low-Loss Electromagnetic Phase Shift
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Solution Overview
Problem
Conventional liquid crystal compositions used for electromagnetic wave control exhibit poor characteristics such as high insertion loss and poor phase shift, making them unsuitable for high-frequency applications.
Innovation Solution
A liquid crystal composition comprising specific compounds represented by Formulas (1), (2), (3), and (4), optimized to provide large dielectric anisotropy, low dielectric loss tangent, and stable temperature range, enabling effective electromagnetic wave control from 1 GHz to 10 THz.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional liquid crystal compositions are used for electromagnetic wave control, then the device structure is simple, but the insertion loss is high and phase shift performance is poor
Solution Approach 1:
The patent modifies the molecular structure parameters of liquid crystal compounds by introducing specific substituents (fluorine, chlorine, cyano groups) and adjusting the core structure (biphenyl, terphenyl, cyclohexane rings) to optimize dielectric anisotropy and loss tangent values for high-frequency electromagnetic wave control
Solution Approach 2:
The patent creates composite liquid crystal compositions by combining multiple liquid crystal compounds with different molecular structures and properties, where each component contributes specific characteristics (dielectric constant, viscosity, temperature range) to achieve overall optimized performance for electromagnetic wave control
2Reliability
If liquid crystal composition is optimized for large dielectric anisotropy, then electromagnetic wave control performance is improved, but the temperature stability range may be reduced
Solution Approach 1:
The patent introduces different types of liquid crystal compounds with specific local molecular structures (cyclic structures for thermal stability, linear structures for dielectric properties) into the composition, where each component contributes its unique properties to the overall system to balance dielectric anisotropy and temperature range
Solution Approach 2:
The patent adjusts the composition ratios of different liquid crystal compounds dynamically to optimize performance across different temperature conditions, ensuring stable dielectric anisotropy throughout the operating temperature range by compensating for temperature-dependent property changes
3Loss of energy
If liquid crystal composition uses complex molecular structures to achieve low loss tangent, then high-frequency characteristics are improved, but manufacturing complexity increases
Solution Approach 1:
The patent systematically varies molecular parameters (substituent types, ring structures, chain lengths) of liquid crystal compounds to achieve optimal loss tangent values, balancing molecular complexity with manufacturability by selecting structures that can be synthesized using established chemical processes
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 high-frequency characteristics with large dielectric anisotropy, low loss tangent, and stable temperature range, enhancing the performance of electromagnetic wave control elements.
Implementation Method 1
A liquid crystal composition having a nematic phase and a positive dielectric anisotropy... the liquid crystal composition has dielectric anisotropy... the liquid crystal composition can change an orientation direction of molecules in response to an external field (electric field) to change the dielectric constant in one direction
Implementation Method 2
a small dielectric loss tangent (tan δ) proportional to absorption energy of electromagnetic wave signals of the liquid crystal composition
Data Source
AI summary
A liquid crystal composition contains at least one compound selected from compounds represented by Formula (1), at least one compound selected from compounds represented by Formula (2), at least one compound selected from compounds represented by Formula (3), and at least one compound selected from compounds represented by Formula (4), and does not contain a compound represented by Formula(S).