Dielectric Waveguide Radar Routing With Fewer Vehicle Radar ICs
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Solution Overview
Problem
Current automotive radar systems require multiple integrated circuits (ICs) placed at various locations on a vehicle, leading to unsightly holes in the vehicle's body for ultrasonic transducers and limited coverage distance compared to radar systems.
Innovation Solution
The use of dielectric waveguides (DWGs) to distribute radar signals throughout a vehicle, allowing for a single radar module to interface with multiple radar antennas, thereby reducing the need for multiple ICs and eliminating the requirement for holes in the vehicle's body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple integrated circuits are placed at various locations on a vehicle to provide radar coverage, then the radar coverage area is improved, but the device complexity and number of components increases
Solution Approach 1:
The patent combines multiple radar IC functions into a single radar module located in the rearview mirror. This single module integrates the radar transceiver and signal processing capabilities that would otherwise require multiple separate ICs distributed throughout the vehicle, thereby reducing component count while maintaining comprehensive coverage.
Solution Approach 2:
The patent introduces dielectric waveguides as intermediary transmission lines to distribute radar signals from the single rearview mirror module to multiple antenna locations throughout the vehicle. These waveguides enable long-distance signal transmission with minimal loss, allowing one IC to effectively serve multiple coverage zones that would traditionally require multiple ICs.
2Ease of manufacture
If ultrasonic transducers are used in parking assist systems with holes in the bumper, then the manufacturing simplicity is improved, but the aesthetic appearance deteriorates
Solution Approach 1:
The patent replaces ultrasonic transducers with electromagnetic radar antennas. Radar signals can be transmitted through the vehicle's body panels without requiring physical holes, as the electromagnetic waves penetrate the material. This substitution eliminates the aesthetic issue of holes in the bumper while maintaining the functionality of detecting obstacles for parking assist.
3Quantity of substance
If ultrasonic transducers are used for parking assist, then the cost is reduced, but the coverage distance is limited
Solution Approach 1:
The patent changes the operating frequency parameter from ultrasonic frequencies (typically 40kHz) to radar frequencies (77GHz). This parameter change enables significantly longer detection ranges because radar waves have better penetration and propagation characteristics through air and vehicle materials, extending the effective coverage distance well beyond the limited range of ultrasonic systems.
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
This solution provides a low-cost, flexible, and efficient means to distribute radar signals, offering 180-degree coverage without the need for unsightly holes and extending the coverage distance significantly compared to ultrasonic systems.
Implementation Method 1
A dielectric waveguide employs a solid dielectric core rather than a hollow pipe. A dielectric is an electrical insulator that can be polarized by an applied electric field. When a dielectric is placed in an electric field, electric charges do not flow through the material as they do in a conductor, but only slightly shift from their average equilibrium positions causing dielectric polarization.
Implementation Method 2
When a dielectric is placed in an electric field, electric charges do not flow through the material as they do in a conductor, but only slightly shift from their average equilibrium positions causing dielectric polarization. Because of dielectric polarization, positive charges are displaced toward the field and negative charges shift in the opposite direction. This creates an internal electric field which reduces the overall field within the dielectric itself.
Implementation Method 3
Radar signals may be transmitted 通过 body parts of the vehicle. Other embodiments may use any number of now known or later developed launching structures that may be used to launch and receive radar signals through body parts of a vehicle.
Data Source
AI summary
A system is provided for transmitting sub-terahertz electro-magnetic radio frequency (RF) signals using a dielectric waveguide (DWG) having a dielectric core member surrounded by dielectric cladding. Multiple radar signals may be generated by a radar module that is coupled to a vehicle. A set of DWG segments may be used to transport the radar signals to various launching structures placed in various locations of the vehicle.