Vehicle Exterior Radar Cover Angles for Low Millimeter-Wave Loss
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Solution Overview
Problem
Existing vehicle exterior components, such as emblems and light emitting devices, attenuate millimeter waves emitted by radar devices, leading to reduced detection accuracy and increased attenuation of electromagnetic waves.
Innovation Solution
A vehicle exterior component comprising a cover, a housing, and a substrate with a light emitting unit, where the cover forms an angle of 0° to 5° with respect to the orthogonal plane, and the housing's rear wall forms an angle of 2° to 10°, along with an electromagnetic wave absorber or a distance between the substrate and the emission range, to minimize wave attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a cover and light emitting device are disposed in front of the radar device, then the aesthetic appeal and visibility of the vehicle are improved, but the millimeter wave transmission is attenuated
Solution Approach 1:
The patent applies parameter changes by optimizing the angle of the cover (0° to 5° relative to orthogonal plane) and the angle of the rear wall (2° to 10° relative to orthogonal plane). These angular parameters are specifically tuned to minimize millimeter wave attenuation while maintaining the cover's aesthetic and illuminating functions. The light emitting device parameters are also optimized to provide sufficient illumination without excessive wave absorption.
Solution Approach 2:
The cover is constructed using composite materials that combine aesthetic properties with millimeter wave transmissivity. The material composition is designed to allow millimeter waves to pass through while maintaining visual appeal and structural integrity. This composite approach enables the cover to fulfill multiple functions simultaneously without significant wave attenuation.
2Volume of moving object
If the cover is positioned closer to the radar device, then the structural compactness is improved, but the millimeter wave detection accuracy is reduced
Solution Approach 1:
The patent optimizes the distance parameter between the cover and radar device, setting it to an integer multiple of half the millimeter wave wavelength. This parameter tuning ensures that the electromagnetic wave path length maintains detection accuracy while achieving compact structural design. The angular parameters of the cover and rear wall are also adjusted to compensate for the reduced distance.
3Volume of moving object
If the substrate is disposed adjacent to the emission range, then the space utilization is improved, but the electromagnetic waves are scattered or absorbed
Solution Approach 1:
The patent applies local quality by providing electromagnetic wave absorbers at specific locations where wave scattering would occur, such as at the ends of the substrate facing the emission range. This localized treatment allows the substrate to be positioned close to the emission range for space efficiency while minimizing wave loss only at critical points. The absorbers are strategically placed rather than uniformly distributed throughout the entire structure.
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 configuration reduces millimeter wave attenuation through the exterior component, enhances detection accuracy of the radar device, and improves the aesthetic appeal by uniform illumination of the cover.
Implementation Method 1
an electromagnetic wave absorber is provided at an end of the substrate that faces the emission range of the electromagnetic waves, the electromagnetic wave absorber absorbing the electromagnetic waves
Implementation Method 2
A millimeter wave radar device installed in a land vehicle typically emits millimeter waves to the outside of the land vehicle. When the millimeter waves that are emitted from the millimeter wave radar device hit and are reflected by an object outside the land vehicle
Implementation Method 3
The cover and the housing have millimeter wave transmissivity. The millimeter waves emitted and received by the millimeter wave radar device are attenuated when being transmitted through the emblem and the light emitting device
Data Source
AI summary
A vehicle exterior component includes a cover, a housing, and a substrate. The cover is configured to arranged forward of a radar device in an emission direction of electromagnetic waves. The housing covers a rear surface of the cover. The substrate is arranged in the housing. The substrate includes a light emitting unit configured to emit visible light. The cover forms an angle in a range of 0° to 5° with respect to an orthogonal plane that is orthogonal to the emission direction. The rear wall of the housing faces the cover in the emission direction and forms an angle in a range of 2° to 10° with respect to the orthogonal plane.