Radar Antenna Substrate Wave Coupling for Pattern Integrity

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Solution Overview

Problem

Radar sensors experience unwanted substrate waves that cause interference and alter the radiation pattern due to uncontrollable coupling at the edges of the antenna substrate, leading to manufacturing challenges and increased production costs.

Innovation Solution

A radar sensor design incorporating a coupling structure that directs substrate waves into a radiation area where they are absorbed by an absorber, maintaining directional control and reducing interference without additional production steps.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If substrate waves are allowed to propagate freely in the antenna substrate, then the antenna structure can be simple, but the substrate waves cause interference and alter the radiation pattern

Engineering Contradiction:

Improveradiation pattern integrityVSAvoidantenna substrate structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The harmful substrate waves are extracted from the antenna substrate by the coupling structure, which couples them out and directs them to the absorber. This separates the harmful substrate waves from the main antenna operation, preventing interference while maintaining a relatively simple antenna substrate structure.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The harmful substrate waves that cause interference are converted into a beneficial solution by directing them to the absorber. The coupling structure transforms the unwanted substrate waves into controllable coupling waves that are then absorbed, turning a harmful effect into a controlled process that protects radiation pattern integrity.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

2Reliability

If coupling structures are added to control substrate waves, then radiation pattern integrity is improved, but manufacturing complexity increases

Engineering Contradiction:

Improveradiation pattern integrityVSAvoidproduction process

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The coupling structure and absorber are merged into a single integrated component that performs both functions: coupling out substrate waves and absorbing them. This integration reduces the number of separate components and simplifies the manufacturing process while maintaining radiation pattern integrity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The coupling structure serves multiple functions: it acts as a coupling element for substrate waves, directs them toward the absorber, and works together with the absorber to eliminate interference. This multi-functionality reduces the need for additional separate components, simplifying manufacturing.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Object-affected harmful factors

If absorbers are placed in the radiation area to absorb coupling waves, then interference is reduced, but device complexity increases

Engineering Contradiction:

Improveinterference from substrate wavesVSAvoidradar sensor structure

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The absorber acts as an intermediary element that receives the coupling waves from the coupling structure and converts them into heat. This intermediary approach allows the substrate waves to be controlled and absorbed without directly modifying the antenna structure, reducing overall device complexity.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 solution effectively manages substrate waves, maintaining the radar sensor's radiation pattern integrity and reducing manufacturing complexity and costs by using a cost-neutral approach.

Implementation Method 1

the coupling structure is configured to couple substrate waves from an antenna substrate used as a support for the antenna structure and the coupling structure and to radiate them as coupling waves into a radiation area

Methodology Applied

Scientific EffectSubstrate wave coupling:

Implementation Method 2

an absorber arranged in the radiation area for absorbing the coupling waves

Methodology Applied

Scientific EffectElectromagnetic wave absorption: Absorption (EM radiation)

Data Source

PatentEP3870993B1Radar sensor

Publication Date: 2026.01.07 ROBERT BOSCH GMBH

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AI summary

The invention relates to a radar sensor (100) having at least one antenna structure (104) and at least one coupling structure (106), which is designed to couple substrate waves (114) out of an antenna substrate (102) used as a carrier for the antenna structure (104) and for the coupling structure (106), and to emit the same as coupled waves (200) in an emission region (206), wherein the radar sensor (100) also has an absorber (202) arranged in the emission region (206) to absorb the coupled waves (200).