C-C Triple Bond Liquid Crystal Compounds for Low-Loss Antennas
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Solution Overview
Problem
Existing liquid crystalline media for high-frequency applications, such as tunable antennas, face challenges with high losses and inadequate material quality, particularly in the microwave range, and require improved low-temperature behavior and optical anisotropy.
Innovation Solution
Development of compounds with a C-C triple bond within a chain of ring systems that exhibit low melting points, high clearing points, and neutral dielectric anisotropy, suitable for broad nematic phase ranges and high optical anisotropy, which are used to create liquid-crystalline media with reduced loss factors and improved material quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional liquid crystal media are used in high-frequency applications, then the basic function of voltage-controlled dielectric property adjustment is achieved, but high losses and inadequate material quality occur in the microwave range
Solution Approach 1:
The patent changes the molecular structure parameters of liquid crystal compounds by introducing C-C triple bonds within ring system chains, which fundamentally alters the dielectric properties and reduces loss factors in the microwave frequency range while improving material quality for high-frequency applications
Solution Approach 2:
The patent creates composite liquid crystal media by combining compounds with C-C triple bonds and other liquid crystal components, achieving a synergistic effect that reduces energy losses and improves overall material quality for microwave and gigahertz range applications
2Adaptability or versatility
If liquid crystalline media are used for tunable antennas, then voltage-controlled dielectric property adjustment is achieved, but undesirable rotation occurs at high frequencies
Solution Approach 1:
The patent introduces specific local structural features (C-C triple bonds within ring systems) that create anisotropic molecular properties, allowing the molecules to maintain stable orientation along the triple bond axis while still enabling voltage-controlled dielectric adjustment, thus reducing undesirable rotation at high frequencies
3Temperature
If existing liquid crystal compounds are used, then basic liquid crystalline properties are achieved, but low-temperature behavior is insufficient
Solution Approach 1:
The patent modifies the molecular parameters by incorporating flexible alkyl chains and specific ring structures with C-C triple bonds, which lowers the melting point and broadens the liquid crystalline phase temperature range, enabling reliable operation at lower temperatures
4Illumination intensity
If liquid crystalline media are designed for high optical anisotropy, then optical performance is improved, but dielectric anisotropy becomes non-neutral affecting high-frequency performance
Solution Approach 1:
The patent creates local anisotropic regions through C-C triple bonds within ring systems that contribute to optical anisotropy, while the overall molecular symmetry and electron distribution are designed to achieve neutral dielectric anisotropy, thus improving optical performance without increasing dielectric losses at gigahertz frequencies
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 compounds provide enhanced performance in high-frequency applications by minimizing undesirable rotation, reducing loss factors in the microwave spectrum, and maintaining effective dielectric properties across varying temperatures, making them suitable for phase shifters and other high-frequency components.
Implementation Method 1
the compounds according to the invention have low melting points and high clearing points (transition of the nematic phase into the isotropic phase). In the liquid crystalline range, the compounds are predominantly nematic or support the nematic phase
Implementation Method 2
At the same time, the optical anisotropy (Δn) is high, making them ideal for use as a high-frequency medium
Implementation Method 3
the compounds according to the invention have low melting points and high clearing points (transition of the nematic phase into the isotropic phase). In the liquid crystalline range, the compounds are predominantly nematic or support the nematic phase. At the same time, the optical anisotropy (Δn) is high, making them ideal for use as a high-frequency medium, for example. It was found that the compounds according to the invention can be used to produce liquid-crystalline media with a broad nematic phase range and at the same time high values for Δn and advantageous high-frequency properties
Data Source
AI summary
The present invention relates to compounds having at least one C-C triple bond of the formula (I) having neutral dielectric anisotropy, and to the use thereof for high-frequency components, to liquid-crystalline media comprising the compounds and to high-frequency components comprising these media, especially antennas, specifically for the giga- and terahertz sector. The liquid-crystalline media serve, for example, to shift the phase of microwaves for tunable 'phased-array' antennas.