Wave-Transmissive Colored Laminate for Automotive Grille Radar
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Solution Overview
Problem
Existing automobile front grilles with coating films containing metallic fillers face challenges in maintaining electromagnetic wave transmissivity due to the high relative permittivity of these films.
Innovation Solution
A laminate structure comprising a synthetic resin substrate and a colored layer with a relative permittivity ranging from 3.1 to 66.7, where the effective permittivity of the laminate is greater than the substrate's permittivity but not exceeding 3.0, ensuring high millimeter wave transmissivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a coating film containing metallic fillers is applied to the front grille, then appearance color and design flexibility are improved, but electromagnetic wave transmissivity deteriorates due to high relative permittivity exceeding 3.0
Solution Approach 1:
The patent applies parameter changes by precisely controlling the relative permittivity of the colored layer within 3.1 to 66.7 and optimizing its thickness to achieve an effective permittivity of the laminate between 2.0 to 3.0. This parameter optimization allows the colored layer with metallic fillers to maintain both appearance color and electromagnetic wave transmissivity, resolving the contradiction between design flexibility and radar wave transmission.
Solution Approach 2:
The patent uses composite materials by creating a multi-layer laminate structure consisting of a substrate and a colored layer with metallic fillers. The combination of these layers with specific permittivity characteristics creates a composite structure that achieves both coloring function and electromagnetic wave transmissivity, overcoming the limitation of single-material coating films.
2Illumination intensity
If the relative permittivity of the colored layer is increased to enhance color intensity, then appearance quality is improved, but the effective permittivity of the laminate exceeds 3.0, reducing electromagnetic wave transmissivity
Solution Approach 1:
The patent resolves this contradiction by optimizing two parameters simultaneously: the relative permittivity of the colored layer (3.1 to 66.7) and its thickness. By adjusting these parameters together, the effective permittivity of the laminate is controlled within 2.0 to 3.0, allowing high color intensity through metallic fillers while maintaining electromagnetic wave transmissivity.
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 laminate achieves enhanced electromagnetic wave transmissivity while allowing for greater design flexibility in appearance colors, reducing reflection attenuation to -18 dB or less.
Implementation Method 1
A relative permittivity of the colored layer is in a range of 3.1 to 66.7. An effective permittivity of the laminate is greater than a relative permittivity of the substrate and 3.0 or less
Data Source
AI summary
A laminate has an electromagnetic wave transmissivity. The laminate includes a substrate made of a synthetic resin and a colored layer laminated on the substrate. The relative permittivity of the colored layer is in a range of 3.1 to 66.7. The effective permittivity of the laminate is greater than the relative permittivity of the substrate and 3.0 or less.