Radar Antenna Isolation Structure for Reflection Suppression
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Solution Overview
Problem
Automotive radar sensors experience performance degradation due to disturbing effects such as radome insertion and transmission losses, boresight errors, and specular multibounce reflections when mounted behind vehicle components, which are challenging to mitigate with existing designs and materials.
Innovation Solution
A radar sensor design incorporating a dual-purpose structure with angled corrugations and a diffraction grating surface that isolates antenna elements and suppresses reflections through deflection and destructive interference, eliminating the need for expensive absorber materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If highly dissipative dielectric materials are used as absorber layers to reduce reflections and improve isolation, then the disturbing effects are mitigated, but the cost of the radar sensor increases significantly
Solution Approach 1:
The patent replaces expensive highly dissipative dielectric absorber materials with a cost-effective metallic mesh structure that achieves the same isolation and reflection suppression functions. The metallic mesh is a simpler, cheaper alternative that provides durable performance without the high cost of specialized absorber materials.
Solution Approach 2:
The patent changes the material parameter from expensive dissipative dielectric to inexpensive metallic mesh, while maintaining the functional parameters of isolation and reflection suppression through geometric design (mesh pattern, spacing, conductivity) rather than relying on material dissipation properties.
2Volume of moving object
If metallic waveguide antenna technology is applied to achieve compact structure, then the structural radar cross-section increases due to highly reflective metallic surfaces
Solution Approach 1:
The patent converts the harmful reflective property of metallic surfaces into a beneficial function by using the metallic mesh structure specifically designed to reflect and redirect radar waves away from the sensor. The same metallic material that causes high RCS is configured (as a mesh with specific geometry) to actively suppress unwanted reflections and improve angular coverage.
Solution Approach 2:
The patent applies metallic mesh with specific local geometric properties (opening size, pattern, orientation) in specific locations to control radar wave behavior. The local structure of the mesh is optimized to provide reflection suppression and isolation functions, transforming the general harmful reflective property into a localized beneficial effect.
3Ease of operation
If radar sensor is integrated behind vehicle components for aerodynamic and aesthetic reasons, then the integration is improved, but the performance is degraded due to disturbing effects and multibounce reflections
Solution Approach 1:
The patent applies preliminary anti-action by pre-configuring the metallic mesh structure to counteract the disturbing effects and multibounce reflections that will occur when the sensor is integrated behind vehicle components. The mesh is designed beforehand to reflect and redirect waves away from problematic paths, preventing performance degradation before it occurs.
Solution Approach 2:
The metallic mesh structure serves multiple functions simultaneously: it provides isolation between antenna elements, suppresses reflections from the radome and surrounding structures, redirects radar waves to improve angular coverage, and maintains a compact form factor suitable for integration behind vehicle components.
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 design reduces structural radar cross-section, improves angle finding performance, and enhances coverage in azimuth and elevation angles, while maintaining cost-effectiveness across various frequencies, including those used in automotive radar sensors.
Implementation Method 1
each dual-purpose structure is configured to isolate the associated antenna element from the other antenna elements with respect to the transmitted and received radar waves
Implementation Method 2
each dual-purpose structure is configured to suppress and to deflect reflections of incident radar waves
Implementation Method 3
a good isolation may be achieved between antenna elements, and surface waves as well as multibounce reflections may be efficiently absorbed
Data Source
AI summary
A radar sensor comprises a layer including at least one active region and at least one passive region. The active region includes a plurality of antenna elements being configured to transmit and to receive radar waves, and the passive region is free of antenna elements. A respective dual-purpose structure is associated with each antenna element of the active region, wherein each dual-purpose structure is configured to isolate the associated antenna element from the other antenna elements with respect to the transmitted and received radar waves. At the same time, each dual-purpose structure is configured to suppress and redirect reflections of incident radar waves.