Vehicle Radar Antenna Ground Segmentation for Phase Stability
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Solution Overview
Problem
Existing vehicle radars face challenges in maintaining the stability of antenna patterns and phases, particularly due to the design of the ground structure which affects the accuracy of electromagnetic wave transmission and reception.
Innovation Solution
The radar system incorporates a waveguide antenna embedded within a frame, with a metallic plated region and an unplated region adjacent to the waveguide antenna, allowing for adjustable size and shape of the ground to enhance stability, and featuring an unplated region that is at least half the wavelength wide and longer than the waveguide antenna, reducing the overall ground volume and improving pattern stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional ground structure is used for the waveguide antenna, then the antenna can be manufactured with standard procedures, but the antenna pattern and phase stability deteriorates
Solution Approach 1:
The ground structure is segmented into multiple regions: a plated region surrounding the outer peripheral surface of the frame and an unplated region adjacent to the waveguide antenna. This segmentation allows different portions of the ground to serve different functions - the plated region provides structural support and grounding, while the unplated region near the antenna improves electromagnetic field distribution and stability without requiring complex manufacturing
Solution Approach 2:
Different regions of the ground structure are given different properties - the plated region has metallic coating for electrical connectivity and structural integrity, while the unplated region adjacent to the waveguide antenna has a different electromagnetic characteristic that enhances pattern and phase stability. This local differentiation resolves the contradiction by optimizing each region for its specific function
2Reliability
If the ground volume is reduced to improve pattern stability, then the antenna performance improves, but the structural support and shielding capability may deteriorate
Solution Approach 1:
The ground is divided into plated and unplated regions, where the plated region maintains structural support and shielding functions by surrounding the frame's outer peripheral surface, while the unplated region adjacent to the antenna is reduced in volume to improve electromagnetic pattern stability. This segmentation allows structural integrity to be maintained while achieving the desired electromagnetic performance
Solution Approach 2:
The ground structure has non-uniform properties - the plated region provides structural strength and electromagnetic shielding where needed, while the unplated region near the antenna has reduced volume to optimize the electromagnetic field distribution. This local quality differentiation resolves the contradiction between structural support and pattern stability
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 improves the stability of the antenna pattern and phase, allowing for more accurate transmission and reception of electromagnetic waves, enabling better vehicle control and adaptability to various antenna structures.
Implementation Method 1
a radar for a vehicle and a vehicle including the same which can improve the stability of an antenna pattern and a phase
Implementation Method 2
an unplated region in which the metallic material is not disposed is formed on one surface of the frame, and wherein the unplated region is disposed to be adjacent to the waveguide antenna
Data Source
AI summary
A radar for a vehicle may include a frame having a waveguide antenna embedded therein and extending in a direction crossing an extension direction of the waveguide antenna, a plated region covering at least a portion of the outer peripheral surface of the frame and formed of a metallic material, and an un-plated region not coated with the metallic material on one surface of the frame, wherein the un-plated region is located to be adjacent to the waveguide antenna. Therefore, the radar for the vehicle can improve the stability of an antenna pattern and a phase.