Multilayer Reflective Films for mm-Wave Transparent Vehicle Panels
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Solution Overview
Problem
The automotive industry's increasing reliance on connected vehicles requires more sensors, leading to higher data transmission rates, particularly in the mm-wave spectral channel, but conventional metals impede mm-wave electromagnetic radiation, making it difficult for sensors to penetrate and transmit data effectively.
Innovation Solution
The development of discrete metallic particles and multilayer thin films with a reflective core layer, specifically using nickel-chromium (NiCr) alloys, which have a greater skin depth and reduced transmission attenuation, allowing for improved penetration and transmission of mm-wave electromagnetic radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional metals are used in vehicle components, then structural strength and design aesthetics are maintained, but mm-wave electromagnetic radiation transmission is impeded
Solution Approach 1:
The patent employs composite material structures including multilayer thin films with alternating high and low refractive index dielectric layers combined with metallic particles. This composite approach enables simultaneous achievement of mechanical strength from metal components and mm-wave transmission through optimized dielectric-metal composite structures with controlled layer thicknesses and material properties.
Solution Approach 2:
The patent utilizes parameter changes by controlling the skin depth of metallic particles through adjustments in metal type, particle size, shape, and concentration. By optimizing these parameters, the metallic components maintain structural integrity while their electromagnetic interaction parameters are tuned to allow mm-wave penetration at specific frequency ranges.
2Productivity
If more sensors are incorporated into vehicles for connected vehicle applications, then data transmission capability is improved, but vehicle design complexity and aesthetic impact increase
Solution Approach 1:
The patent creates multilayer thin film structures that serve multiple functions simultaneously: they provide mechanical strength, enable mm-wave transmission for sensor operation, maintain design aesthetics through controlled optical properties, and can be integrated into existing vehicle panels. This multi-functionality reduces overall system complexity despite increased sensor count.
Solution Approach 2:
The patent applies local quality by implementing sensor-friendly zones with optimized multilayer structures at specific vehicle locations where sensors are positioned, while maintaining conventional metal structures in other areas. This localized approach enables data transmission capability where needed without compromising overall vehicle design or requiring complete system redesign.
3Object-generated harmful factors
If metallic particles with optimized skin depth are used, then mm-wave transmission is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent manages manufacturing precision requirements by establishing specific parameter ranges for metallic particles (size, shape, concentration) and dielectric layers (thickness, refractive index) that provide optimized mm-wave transmission. By defining these parameter windows, the patent balances performance optimization with manufacturability, allowing standard fabrication tolerances to achieve the desired skin depth 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
These NiCr-based particles and films enable enhanced mm-wave electromagnetic radiation transmission through vehicle components, supporting the integration of more sensors without compromising the vehicle's design aesthetics or functionality.
Implementation Method 1
the discrete metallic particle has a skin depth δ of greater than or equal to 1.0 μm in a frequency range from 20-40 GHz
Implementation Method 2
a multilayer thin film that reflects an omnidirectional structural color
Implementation Method 3
a second layer extending across the reflective core layer, wherein the second layer is a dielectric absorber or dielectric material
Data Source
AI summary
A multilayer thin film that reflects an omnidirectional structural color having a reflective core layer comprising a metallic material, a second layer extending across the reflective core layer, a third layer extending across the second layer, and an outer layer extending across the third layer. The multilayer thin film reflects a single narrow band of visible light that is less than 30° measured in Lab color space when viewed from angles between 0° and 45°, and the reflective core layer has a skin depth δ of greater than or equal to 1.0 μm in a frequency range from 20-40 GHz, as calculated by:δ=2ρ(2πf)(μ0μr)≈503ρμrf,δ is skin depth in meters (m); ρ is resistivity in ohm meter (Ω·m); f is frequency of an electromagnetic radiation in hertz (Hz); μ0 is permeability; and μr is relative permeability of the metallic material.