Radar Sensor Housing Design with Distance-Controlled Radome
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Solution Overview
Problem
Traditional radar sensor housing designs in automotive applications face challenges in being waterproof, providing thermal dissipation, and minimizing multi-path reflections, which affect the radiation pattern.
Innovation Solution
The design incorporates a radome, printed circuit board, PCB holder, metal shield, and housing with specific distance control between the antenna and radome, along with potting glue or thermal dissipation material for waterproofing, heat dissipation, and electromagnetic wave absorption, and optional metal structures for shaping the far-field antenna pattern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional radome design is used, then the radiation pattern is affected by antenna cover design, but waterproofing and thermal dissipation are compromised
Solution Approach 1:
The housing is divided into separate components: a radome portion and a housing portion that can be mated together. This segmentation allows each component to be optimized independently - the radome for radiation characteristics and the housing for thermal management and waterproofing, resolving the contradiction between these functions.
Solution Approach 2:
A potting material is introduced as an intermediary substance that fills the cavity between the PCB assembly and housing. This material simultaneously provides thermal dissipation pathways, waterproofing seals, and structural support, resolving the multiple contradictory requirements through a single mediating medium.
2Device complexity
If the radome is integrated with the housing, then assembly is simplified, but multi-path reflection from back-end objects increases
Solution Approach 1:
The radome is extracted as a separate functional component from the housing structure. By separating the radiation function (radome) from the structural function (housing), the design allows the radome to be optimized for minimal reflection while the housing provides structural support, resolving the contradiction between assembly simplicity and reflection minimization.
Solution Approach 2:
A metal shield is positioned between the PCB and housing to preemptively block electromagnetic waves from reflecting off back-end objects. This preliminary anti-action prevents multi-path reflection before it can affect the radiation pattern, while the separate radome design maintains assembly simplicity through modular construction.
3Ease of manufacture
If distance between antenna and radome is not controlled, then manufacturing is easier, but radiation pattern optimization is compromised
Solution Approach 1:
The PCB holder is designed with integrated positioning features that pre-establish the correct distance between the antenna and radome during assembly. This preliminary action embeds the precision requirement into the tooling and fixtures, making it easy to achieve accurate spacing without requiring complex post-assembly adjustments or tight tolerances on all components.
Solution Approach 2:
The housing and radome are designed with self-aligning features such as ribs, grooves, or定位 structures that automatically establish the correct relative position and distance when mated together. This self-service mechanism ensures precise antenna-to-radome spacing without requiring external measurement or adjustment, resolving the contradiction between manufacturing ease and precision.
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 design enhances waterproofing, thermal management, and reduces multi-path reflections, optimizing the radiation pattern and system performance while simplifying the assembly process.
Implementation Method 1
The second space between the housing and the PCB assembly can be filled with a thermal dissipation material that can be in direct contact with the second side of the PCB assembly
Implementation Method 2
The metal shield may be disposed between the housing and the PCB assembly, and the metal shield can reduce multi-path reflection from one or more objects facing the second side of the PCB assembly
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
Various examples pertaining to a sensor housing design for millimeter wave (mmWave) sensors are described. A sensor housing may include a radar sensor, a printed circuit board (PCB), a radome and a PCB holder. The radar sensor may be capable of emitting a radio wave. The PCB may have a first side and a second side opposite the first side with the radar sensor mounted on the first side thereof to form a PCB assembly (PCBA). The radome may include a cavity in which the PCBA is disposed. The PCB holder may be disposed along a circumference of an inner wall of the radome, and the PCB holder may be configured to hold the PCBA such that a distance between an inner surface of the radome and a side of the radar sensor facing the inner surface of the radome is proportional to half wavelength of the radio wave.