Radar Device Radio Wave Absorber Configuration for Interference Reduction
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Solution Overview
Problem
In radar devices, especially side radars used in ADAS and AD systems, reflected radio waves outside the detection area can interfere with the antenna, leading to deteriorated radar performance due to the reflection of these waves by structures within the detection area, causing detection accuracy issues.
Innovation Solution
A radar device configuration that includes a first radio wave absorber positioned within the non-detection area and a second radio wave absorber facing the first absorber, both non-parallel to each other, to effectively absorb and redirect reflected radio waves away from the detection area, enhancing absorption efficiency and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a radio wave absorber is provided between the radar and reflecting structures to attenuate extra radio waves, then radar performance is improved by reducing interference, but the absorbed radio waves are reflected back by the radar installation plate and mixed with target signals, deteriorating radar performance
Solution Approach 1:
The patent applies the principle of converting harm into benefit by using the reflected radio waves that would normally be harmful to their advantage. The radio wave absorber is positioned and oriented specifically to absorb extra radio waves from non-detection areas, and the housing structure is designed to redirect these absorbed waves away from the antenna, transforming what would be harmful reflections into a beneficial shielding effect that protects the antenna from interference.
Solution Approach 2:
The patent introduces an intermediary structure (the housing with specific geometric features) between the radio wave absorber and the antenna. This intermediary housing structure acts as a mediator that takes the radio waves absorbed by the absorber and redirects them in a controlled manner, preventing them from directly reflecting off the installation plate and mixing with target signals at the antenna.
2Measurement precision
If a radio wave absorber is installed to prevent side lobe reflection, then detection accuracy is improved, but the structure becomes more complex and occupies more space
Solution Approach 1:
The patent merges the radio wave absorber with the housing structure of the radar device. Instead of being a separate, standalone component, the absorber is integrated into the housing, utilizing the housing's geometric features (such as angled surfaces and internal cavities) to serve dual purposes: structural support and radio wave absorption/redirecting. This integration reduces overall structural complexity while maintaining detection accuracy.
Solution Approach 2:
The housing structure is designed to perform multiple functions simultaneously: it provides mechanical protection for the radar components, defines the physical structure of the device, and acts as a radio wave absorber and redirector. This multi-functionality eliminates the need for separate dedicated components, reducing device complexity while achieving the desired detection accuracy.
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 configuration significantly improves the reliability and accuracy of radar detection by minimizing the impact of reflected waves from outside the detection area, while also allowing for a more compact design and reduced cover height, maintaining performance even under deformation or impact.
Implementation Method 1
a radio wave absorber, in which the radar device detects an object by the reception antenna receiving a reflected radio wave obtained by reflecting a radio wave transmitted from the transmission antenna by the object outside the vehicle
Data Source
AI summary
A radar device includes an antenna substrate having a transmission antenna and a reception antenna, and a radio wave absorber, in which the radar device detects an object by the reception antenna receiving a reflected radio wave obtained by reflecting a radio wave transmitted from the transmission antenna by the object outside the vehicle, a detection area that is a detection target range of the object and a non-detection area that is not a detection target range of the object are set within a range of a viewing angle of the radar device, the radio wave absorber includes a first radio wave absorber and a second radio wave absorber, the first radio wave absorber is disposed so as to at least partially reside within the non-detection area, and the second radio wave absorber is disposed to face the first radio wave absorber.