Automotive Radar Antenna Front Face for Reflection Interference Cancellation
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Solution Overview
Problem
Antenna devices for automotive radar applications face challenges with interference and noise due to interactions with surrounding components like bumpers and radomes, which distort radiation patterns and reduce detection accuracy, and existing solutions such as dummy antennas are complex to manufacture or increase antenna thickness.
Innovation Solution
The antenna device features a design with two layers, including scattering elements like protrusions or indentations on the front face to cancel out unwanted reflections through interference, and the use of absorbing materials to reduce noise, allowing for a simpler and thinner structure that minimizes interference and maintains performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If dummy antennas are used to suppress surface waves and reflections, then interference and noise are reduced, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent extracts the essential function of dummy antennas (suppressing surface waves) and implements it through a simplified ground plane mesh structure. Instead of using complex dummy antenna elements, the invention uses a planar mesh pattern that achieves the same wave suppression function with much simpler manufacturing requirements.
Solution Approach 2:
The patent creates a simplified copy of the dummy antenna function through the ground plane mesh. The mesh structure replicates the wave suppression capability of dummy antennas but with a much simpler geometric pattern that is easier to manufacture and integrate into the antenna device.
2Measurement precision
If dummy antennas or protrusions are used to reduce interference, then detection accuracy is improved, but antenna thickness increases
Solution Approach 1:
The patent extracts the interference suppression function from bulky three-dimensional structures (dummy antennas and protrusions) and implements it through a two-dimensional ground plane mesh pattern. This planar implementation achieves the same detection accuracy improvement without increasing antenna thickness.
3Object-generated harmful factors
If a ground plane mesh is used to suppress surface currents, then radiation interference is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent optimizes the mesh pattern parameters (element size, spacing, geometry) to achieve effective surface current suppression while maintaining tolerance to manufacturing variations. By carefully selecting these parameters, the design achieves robust interference reduction without requiring extremely tight manufacturing tolerances.
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 effectively reduces interference and noise, improving radar detection accuracy by canceling out unwanted reflections and maintaining antenna performance while being easier to manufacture and less bulky.
Implementation Method 1
scattering elements 6 by which primary rays 5, impacting in the area of the scattering elements 6, are at least partially reflected by the scattering elements 6 and thereby separated into first secondary rays 7 and second secondary rays 8, such that the first secondary rays 7 and the second secondary rays 8 cancel out each other at least partially by interference
Implementation Method 2
at least partially reflected by the scattering elements 6
Implementation Method 3
the antenna assembly 2 at least partially absorbs the primary rays 5 impacting at the absorbing material 39
Data Source
AI summary
An antenna device for automotive radar applications including an antenna assembly which comprises a front face in which at least one antenna aperture is arranged, configured to receive an incoming signal in form of primary rays impacting in the at least one antenna aperture. The front face of the antenna assembly further includes adjacent to the at least one antenna aperture scattering elements by which primary rays, impacting an area of the scattering elements, are at least partially reflected by the scattering elements and thereby separated into first secondary rays and second secondary rays, such that the first secondary rays and the second secondary rays cancel out each other at least partially by interference.