Platformed Post Waveguides for Shorter Radar Sensor Posts
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Solution Overview
Problem
Waveguide antennas in automotive sensors, such as RADAR sensors, face manufacturing limitations due to the aspect ratio restrictions of posts used in die casting, which can limit the reduction of post height relative to their cross-section, contradicting electrodynamic considerations.
Innovation Solution
The use of platforms to boost the effective height of posts and the incorporation of trenches between adjacent rows of posts allows for shorter posts while maintaining functional equivalence, enabling reduced post height without compromising performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the post height is reduced in relation to cross section for ease of manufacturing, then manufacturing cost and complexity are reduced, but electromagnetic performance deteriorates
Solution Approach 1:
The patent introduces platforms that extend horizontally beneath the posts, adding a dimensional element that compensates for reduced post height. The platforms create an extended effective height structure where the combination of platform height and post height equals the required electromagnetic effective height, allowing shorter posts while maintaining performance
Solution Approach 2:
The platforms act as intermediary structures between the ground plane and the posts. These platforms provide the necessary electromagnetic path length without requiring tall posts, serving as a mediating element that resolves the conflict between manufacturing constraints and electromagnetic requirements
2Reliability
If platforms are added to increase effective post height, then electromagnetic performance is maintained, but device complexity increases
Solution Approach 1:
The platforms are integrated with the ground plane structure, merging two separate components (platform and ground plane) into a unified structural element. This integration reduces the number of discrete parts and simplifies manufacturing while maintaining the electromagnetic function of extending effective height
3Ease of manufacture
If trenches are formed between post rows to reduce distance to cover, then manufacturing is improved, but device complexity increases
Solution Approach 1:
The waveguide structure is segmented into distinct regions by forming trenches between rows of posts. This segmentation creates separate functional zones that can be manufactured and assembled independently, simplifying the overall manufacturing process while the trench geometry maintains electromagnetic performance
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 approach enables the manufacturing of shorter posts while maintaining electromagnetic efficiency, reducing costs and improving manufacturing efficiency without sacrificing performance.
Implementation Method 1
a first plurality of posts arranged in a first row on the conductive member. A second plurality of posts may be arranged in a second row on the conductive member so as to define a waveguide between the first plurality of posts and the second plurality of posts
Data Source
AI summary
Waveguides and related assemblies for use, for example, in RADAR sensor assemblies and the like. In some embodiments, the waveguide may comprise a conductive member having a first plurality of posts arranged in a first row thereon. A second plurality of posts may be arranged in a second row on the conductive member to define a waveguide between the first plurality of posts and the second plurality of posts. One or more platforms may be provided to project at least a subset of the first plurality of posts and the second plurality of posts beyond at least a portion of the conductive member adjacent to the one or more platforms. A second conductive member, such as a cover, may be coupled to the conductive member such that the first and second pluralities of posts extend between the conductive member and the cover.