Liquid Crystal Composition for 1 GHz to 10 THz Phase Control
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Solution Overview
Problem
Existing liquid crystal compositions used for phase control of electromagnetic wave signals in the 1 GHz to 10 THz frequency range lack a wide usable temperature range, high gain, low loss, and sufficient dielectric anisotropy, which are essential for efficient phase control in millimeter-wave and microwave applications.
Innovation Solution
A liquid crystal composition comprising specific compounds represented by Formulas (1), (2), and (3), with defined structural features and proportions, is developed to achieve high upper and low lower limit temperatures, low viscosity, and large dielectric anisotropy, ensuring stability and effective phase control across the desired frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional liquid crystal compositions are used for phase control, then the device structure is simple, but the usable temperature range is narrow and dielectric anisotropy is insufficient
Solution Approach 1:
The patent employs a composite liquid crystal composition comprising multiple specific compounds (cyclohexane derivatives, phenyl cyclohexane derivatives, and other liquid crystal compounds) in defined weight ratios. This composite approach enables the composition to maintain nematic phase stability across an extended temperature range while achieving sufficient dielectric anisotropy for effective phase control of electromagnetic waves.
Solution Approach 2:
The patent optimizes specific physical and chemical parameters of the liquid crystal compounds, including molecular structure characteristics (represented by parameters a, b, c in the general formula), weight ratios of different compounds, and resulting macroscopic properties (dielectric anisotropy, viscosity, temperature range). By systematically adjusting these parameters, the composition achieves both wide temperature stability and adequate dielectric anisotropy.
2Reliability
If liquid crystal composition with high dielectric anisotropy is used, then phase control performance is improved, but viscosity increases reducing response speed
Solution Approach 1:
The patent carefully balances the molecular structures and proportions of constituent compounds to achieve optimal parameter combinations. The composition maintains dielectric anisotropy sufficient for reliable phase control while controlling viscosity through selective compound choices and ratios, thereby preserving adequate response speed for practical applications.
Solution Approach 2:
The patent introduces specific functional groups and molecular characteristics at localized positions within the liquid crystal molecules (as defined by the structural parameters in the general formula). This local structural optimization allows different regions of the molecular system to contribute differently to dielectric anisotropy and viscosity, achieving a balanced performance profile.
3Adaptability or versatility
If liquid crystal composition is optimized for wide temperature range, then adaptability is improved, but dielectric anisotropy in microwave frequency region decreases
Solution Approach 1:
The patent designs a multi-component liquid crystal composition where each compound contributes specific properties. The synergistic interaction among cyclohexane derivatives, phenyl cyclohexane derivatives, and other liquid crystal compounds enables the composition to simultaneously achieve wide nematic phase temperature range and sufficient dielectric anisotropy in the microwave frequency region (1 GHz to 10 THz).
Solution Approach 2:
The liquid crystal composition is designed to fulfill multiple functions simultaneously: maintaining nematic phase stability across a wide temperature range, providing adequate dielectric anisotropy for microwave frequency phase control, and ensuring acceptable viscosity for reasonable response speed. The multi-component system achieves this multi-functionality through careful selection and proportioning of constituents.
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 maintains a nematic phase in a wide temperature range, provides large dielectric anisotropy, and minimizes tan δ, enabling excellent phase control of electromagnetic wave signals from 1 GHz to 10 THz with reduced drive voltage and improved voltage retention.
Implementation Method 1
The liquid crystal composition having dielectric anisotropy has different dielectric constants in a vertical direction and a horizontal direction with respect to an orientation direction of the liquid crystal composition
Implementation Method 2
the orientation of a molecule changes according to a bias electric field from outside, and the dielectric constant changes
Data Source
AI summary
A material used in an element for phase control of an electromagnetic wave signal having a frequency of 1 GHz to 10 THz. A liquid crystal composition containing at least one compound selected from a group of compounds represented by Formula (1), at least one compound selected from a group of compounds represented by Formula (2) and at least one compound selected from a group of compounds represented by Formula (3). In Formulae (1) to (3), R1, R21, R22, R31, and R32 may be alkyls having 1 to 12 carbon atoms; a ring A1 may be 1,4-phenylene; Z11, Z13, Z21, Z23, Z31, and Z33 may be single bonds; Z12, Z22, and Z32 may be —C≡C— or —C≡C—C≡C—; L13 to L16, L21 to L23, and L31 to L36 may be hydrogen or fluorine; Y11 and Y12 may be hydrogen or fluorine; and n1 may be 0.