Vehicle Radar Antenna Layout With Offset Electronics and Waveguides
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Solution Overview
Problem
Existing radar systems in vehicles face challenges in optimizing spatial resolution, energy consumption, and vulnerability to impacts, particularly in autonomous and electric vehicles, due to the need for multiple radars and limited bodywork space, which increases cost and complexity.
Innovation Solution
A radar system with a directional antenna and separated electronic unit, positioned in less impact-prone areas, using a metasurface for wave guidance and operating at higher frequencies, with waveguides connecting the antenna and electronic unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of radars is increased to improve peripheral detection coverage, then the detection space and resolution are improved, but the cost and energy consumption increase
Solution Approach 1:
The radar system is divided into multiple independent radar units, each with its own emitter and receiver. These segmented units can be distributed across different bodywork parts, allowing selective activation based on detection needs, thereby reducing overall energy consumption while maintaining detection coverage.
Solution Approach 2:
The radar system employs periodic scanning and pulsed emission rather than continuous operation. Each radar unit can be activated in alternating time slots or only when specific detection zones require monitoring, reducing energy consumption while maintaining detection resolution through periodic measurements.
2Measurement precision
If the number of radars is increased to improve peripheral detection coverage, then the detection space and resolution are improved, but the cost increases
Solution Approach 1:
Each radar unit is designed as a universal module capable of performing multiple functions (emission, reception, and signal processing) that can be integrated into different bodywork parts. This standardized multi-functional design reduces overall system cost by avoiding the need for different types of radars for different detection zones.
Solution Approach 2:
The patent combines the emitter and receiver into integrated radar units that can share common structural support and mounting infrastructure when installed on the same bodywork part. This merging approach reduces the total number of separate components and assembly requirements, thereby reducing system cost.
3Measurement precision
If multiple radars are distributed over a given surface area to improve detection coverage, then the peripheral space detection is improved, but the available surface area is limited
Solution Approach 1:
The radar units can be mounted on different dimensional planes of the bodywork parts (front, rear, sides, top, bottom) rather than being constrained to a single two-dimensional surface. This three-dimensional distribution allows comprehensive detection coverage while utilizing the full volumetric space available in the vehicle structure.
Solution Approach 2:
The radar units are designed to be compact and can be nested within or integrated into the existing bodywork structure, utilizing unused spaces and cavities within the vehicle chassis and body panels. This nesting approach allows multiple radars to be distributed throughout the vehicle without increasing the external dimensions or requiring additional surface area.
4Area of stationary object
If radars are positioned close to each other to maximize surface area utilization, then the space efficiency is improved, but interference between radars occurs
Solution Approach 1:
Multiple radar units operate in periodic time slots with alternating emission cycles. When one radar unit is transmitting, other units are in reception mode or idle, eliminating mutual interference while allowing compact spatial arrangement. This time-division multiplexing enables efficient surface area utilization without harmful interference.
5Ease of manufacture
If the electronic unit is positioned close to the directional antenna for compact installation, then the installation simplicity is improved, but vulnerability to impacts increases
Solution Approach 1:
The radar system is segmented into separate functional modules: the directional antenna mounted on the bodywork surface and the electronic unit mounted on internal structural elements. This segmentation allows each component to be optimally positioned for its function while protecting sensitive electronics from external impacts.
Solution Approach 2:
A waveguide serves as an intermediary component connecting the directional antenna on the bodywork surface to the electronic unit positioned deeper inside the vehicle structure. This waveguide allows electromagnetic signal transmission while physically separating the antenna from impact-prone zones, protecting the electronic unit from impacts.
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
Enhances spatial resolution and reduces energy consumption while protecting electronic components from impacts, facilitating installation in vehicles with improved imaging and maneuvering capabilities.
Implementation Method 1
the inner space having a metasurface configured to transmit electromagnetic waves with a preferred direction
Implementation Method 2
at least one waveguide for propagating electromagnetic waves between the primary emitter and the cavity and between the cavity and the primary receiver
Implementation Method 3
a radar system for emitting and/or receiving an electromagnetic wave in a desired direction, in particular for detecting an obstacle
Data Source
AI summary
A radar system for a motor vehicle includes at least one directional antenna comprising a housing comprising an inner space forming a reflecting cavity for electromagnetic waves, the inner space having a metasurface configured to transmit electromagnetic waves with a first direction; an electronic unit located outside and at a distance from the housing, comprising a primary emitter and a primary receiver of electromagnetic waves; and at least one waveguide for propagating electromagnetic waves between the primary emitter and the cavity and between the cavity and the primary receiver.