Waveguide Antenna Pin Structure for Radar Leakage Suppression
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Solution Overview
Problem
Vehicle radars experience leakage and false detection due to minute gaps and misalignments in multilayer antenna structures, which affect detection range and accuracy.
Innovation Solution
A radar device with a circuit board, waveguide antenna, and polygonal pins surrounding the port openings to form an artificial magnetic conductor structure, minimizing electromagnetic wave leakage and misalignment issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multilayer bonding structure is used to form antenna, then device integration is improved, but minute gaps between layers cause electromagnetic wave leakage and reflection
Solution Approach 1:
A ground pin is introduced as an intermediary element between the feed line and radiator in the waveguide antenna structure. This ground pin serves as a mediator to provide a reference potential and suppress electromagnetic wave leakage caused by manufacturing gaps, thereby resolving the contradiction between integrated multilayer structure and transmission stability
Solution Approach 2:
The invention changes the structural parameters of the waveguide antenna by adding a ground pin with specific dimensions and positioning. This parameter modification addresses the electromagnetic wave leakage issue without altering the fundamental multilayer integrated structure, maintaining integration while improving reliability
2Measurement precision
If higher frequency electromagnetic waves are used, then radar detection performance is improved, but sensitivity to manufacturing errors increases
Solution Approach 1:
The ground pin is designed beforehand to compensate for potential manufacturing errors. By pre-positioning the ground pin at critical locations in the waveguide antenna structure, the design provides cushioning against the increased sensitivity to manufacturing variations that occurs at higher frequencies, protecting detection accuracy
Solution Approach 2:
The ground pin acts as an intermediary that decouples the high-frequency electromagnetic field from sensitive manufacturing variations. This mediator structure provides a stable reference that reduces the impact of fabrication tolerances on overall antenna performance at 77 GHz
3Reliability
If axial alignment of waveguide lines is improved, then electromagnetic wave transmission is improved, but manufacturing complexity increases
Solution Approach 1:
The ground pin serves as an intermediary alignment reference that simplifies the manufacturing process. By providing a visible and tangible reference point during assembly, the ground pin mediates between the need for precise axial alignment and the practical constraints of manufacturing, making alignment easier while maintaining transmission efficiency
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
The device reduces electromagnetic wave leakage and enhances detection performance by suppressing power loss and reflection, improving detection range and accuracy.
Implementation Method 1
suppresses the occurrence of leakage in a process of transmitting electromagnetic waves
Implementation Method 2
A radar device with a circuit board, waveguide antenna, and polygonal pins surrounding the port openings to form an artificial magnetic conductor structure
Data Source
AI summary
A radar device is disclosed. The radar device may include a circuit board on which a circuit element that generates or receives electromagnetic waves is placed; a waveguide antenna stacked on one surface of the circuit board, and in which a port through which the electromagnetic waves pass is through-formed; and a plurality of pins spaced apart from each other, in the form of surrounding an opening of the port, on one surface of the waveguide antenna facing the circuit board, and having a pillar shape.