Resin Composition High Dielectric Constant Antenna
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Solution Overview
Problem
Conventional resin compositions for high dielectric constant materials face challenges in achieving a balance between high dielectric constant, low dielectric loss tangent, impact resistance, and good outer appearance, particularly in antenna applications, where increased ceramic powder content leads to high specific gravity and fragility, and carbon black addition results in poor dispersion and plating issues.
Innovation Solution
A resin composition containing 40-80% by mass of a resin material and 20-60% by mass of carbon black with specific DBP absorption and iodine adsorption values, optimized for high dielectric constant and low dielectric loss tangent, along with a two-color molding process using a polycarbonate resin, and a master batch for coloring with a carbon black having controlled DBP absorption, ensuring excellent dispersion and handling properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the amount of ceramic powder is increased to achieve a higher dielectric constant, then the dielectric constant is improved, but the specific gravity increases and impact resistance deteriorates
Solution Approach 1:
The patent changes the particle size parameter of the ceramic powder to ultra-fine levels (0.1-10 μm), which allows achieving high dielectric constant with reduced powder content, thereby lowering specific gravity while maintaining electrical performance
Solution Approach 2:
The patent creates a composite resin composition combining multiple materials (resin base + ultra-fine ceramic powder + carbon black) with optimized ratios, where the carbon black content is controlled below percolation threshold to maintain insulation while the ultra-fine ceramic provides high dielectric constant with minimal weight penalty
2Reliability
If the amount of carbon black is increased to achieve a higher dielectric constant, then the dielectric constant is improved, but the dispersion quality deteriorates and plating characteristics worsen
Solution Approach 1:
The patent changes the particle size parameter of carbon black to ultra-fine levels and controls the content below percolation threshold (0.1-5 parts by mass per 100 parts resin), which maintains insulation properties while achieving desired dielectric constant with excellent dispersion and plating characteristics
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 a resin composition with excellent dielectric characteristics, improved impact resistance, and a master batch for coloring that ensures a high dielectric constant, low dielectric loss tangent, and a good outer appearance, enabling the production of lightweight, durable antenna components with enhanced performance.
Implementation Method 1
the carbon black (B) has a DBP absorption of 10 to 50 mL/100 g
Implementation Method 2
an iodine adsorption of 5 to 40 mg/g
Data Source
AI summary
This resin composition for high dielectric constant materials contains 40-80% by mass of (A) a resin material and 20-60% by mass of (B) a carbon black. The carbon black (B) has a DBP absorption of 10-50 mL/100 g and an iodine adsorption of 5-40 mg/g. This resin composition for high dielectric constant materials has a dielectric constant of 4 or more and a dielectric loss tangent of 0.05 or less.