Behind-License-Plate Radar Array for Sub-Degree Angular Resolution
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Solution Overview
Problem
Existing front radar sensors in automotive applications face challenges in achieving high angular resolution due to integration difficulties and signal distortions caused by varying material properties of vehicle components, which affect radar detection performance and accuracy.
Innovation Solution
A radar system with a two-dimensional antenna array arrangement on a large area, typically behind the vehicle's license plate, utilizing a MIMO configuration with antennas placed on the edges to minimize interference from license plate materials and characters, allowing for improved resolution and integration without affecting aesthetic or aerodynamic properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If radar sensors with larger physical apertures are used to achieve higher angular resolution, then measurement precision is improved, but device complexity and integration difficulty increase
Solution Approach 1:
The patent transitions from conventional one-dimensional linear antenna arrays to two-dimensional planar antenna arrays. This dimensional change enables the radar system to achieve higher angular resolution (sub-degree level) without proportionally increasing the physical aperture size, thereby reducing integration difficulty while maintaining measurement precision.
Solution Approach 2:
The patent divides the large aperture into multiple smaller antenna elements arranged in a two-dimensional grid pattern. This segmentation allows the system to achieve high angular resolution through spatial distribution of multiple small elements rather than requiring a single large aperture, simplifying integration into vehicle bumpers and fascias.
2Ease of operation
If radar sensors are integrated behind the front bumper or fascia to maintain aesthetic and aerodynamic properties, then ease of operation is improved, but signal quality deteriorates due to material interference
Solution Approach 1:
The patent introduces a specialized antenna substrate as an intermediary layer between the radar electronics and the vehicle's plastic bumper/fascia. This substrate is designed with specific electromagnetic properties to minimize signal attenuation and distortion caused by the plastic materials, thereby maintaining signal quality while allowing aesthetic integration behind the bumper.
Solution Approach 2:
The patent optimizes the electromagnetic parameters (permittivity, permeability, thickness) of the antenna substrate to compensate for the attenuating and distorting effects of the plastic bumper materials. By adjusting these parameters, the system maintains reliable signal transmission while integrated behind the aesthetic coverings.
3Measurement precision
If antennas are arranged on a large two-dimensional area to achieve sub-degree resolution, then measurement precision is improved, but the area required for installation increases
Solution Approach 1:
The patent employs two-dimensional antenna arrays that utilize both horizontal and vertical spatial dimensions efficiently. This allows the system to achieve sub-degree angular resolution with a compact footprint by distributing antennas across a planar surface rather than requiring a large linear aperture, thus reducing the overall installation area required.
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 system achieves sub-degree level resolution and enhanced radar performance by optimizing antenna placement and material selection, reducing signal distortions, and enabling integration into various vehicle models without additional modifications.
Implementation Method 1
Radar sensors are used in automotive applications (e.g. in motor vehicles such as cars) to provide safety and comfort functions
Implementation Method 2
The varying material properties of the elements covering the radar sensors can massively influence the radar signal quality
Implementation Method 3
Since the radar antennas are arranged on a relatively large two-dimensional area, the radar system has an improved, sub degree level resolution
Implementation Method 4
The distance between these two antennas thus corresponds to a diagonal extension of the two-dimensional area
Data Source
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AI summary
The present disclosure relates to a radar system for automotive applications. The radar system comprises a multitude of radar antennas which are arranged on an enlarged two-dimensional area. The present disclosure further relates to a component of a car, in particular a front component of a car. The component comprises a radar housing, and a radar system supported by the radar housing.