Antenna Device Conductor Patterns Resonance

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Solution Overview

Problem

Existing antenna devices on dielectric substrates face interference from reflected waves and manufacturing variations, such as overetching or underetching, which affect the antenna directive and frequency characteristics.

Innovation Solution

The antenna device incorporates a dielectric substrate with a base plate and an additional function part comprising conductor patterns that resonate in specific directions, generating polarized waves different from the antenna's transmitted/received waves, and feature line patterns narrower than the total width in perpendicular directions, which suppress interference and stabilize frequency characteristics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If conventional conductor patterns are used in the additional function part, then manufacturing variations such as overetching or underetching occur, but this causes frequency characteristics to shift and antenna directive to be disturbed

Engineering Contradiction:

Improveconductor pattern dimensionsVSAvoidfrequency characteristics stability

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The conductor patterns in the additional function part are designed with specific dimensional parameters (width, length, spacing) that create resonance at frequencies different from the antenna part's operating frequency. This parameter design ensures that even with manufacturing variations, the resonance frequency remains distinct from the operating frequency, preventing frequency characteristic shifts and maintaining stable antenna performance.

Inventive Principle:

Principle #35Parameter changes

2Ease of manufacture

If the additional function part uses wide conductor patterns, then manufacturing is easier, but this increases sensitivity to etching variations and affects frequency characteristics

Engineering Contradiction:

Improveconductor pattern fabricationVSAvoidfrequency characteristic control

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The conductor patterns are designed with optimized dimensional parameters that balance manufacturability with frequency stability. The specific width, length, and spacing parameters are chosen to achieve the desired resonance characteristics while being tolerant to normal manufacturing variations, thus maintaining both ease of manufacture and frequency control.

Inventive Principle:

Principle #35Parameter changes

3Device complexity

If conventional antenna design is used without additional function part, then device complexity is low, but reflected waves from bumper interfere with antenna directive

Engineering Contradiction:

Improveantenna structureVSAvoidreflected wave interference

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The additional function part with conductor patterns is designed to resonate at frequencies different from the antenna part's operating frequency. This resonance converts the potentially harmful reflected waves into beneficial effects by creating a frequency separation that prevents interference, thus converting the harmful reflection into a beneficial frequency discrimination mechanism.

Inventive Principle:

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

Solution Approach 2:

The additional function part acts as an intermediary element between the antenna part and the bumper environment. The conductor patterns in this intermediate structure resonate at different frequencies, serving as a mediator that prevents the direct interference path between reflected waves and the antenna's operating frequency.

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

This configuration effectively reduces antenna directive disturbance and maintains stable frequency characteristics despite manufacturing variations, improving the antenna's performance by minimizing interference and maintaining consistent operation across different manufacturing tolerances.

Implementation Method 1

The plurality of conductor patterns resonate in one or more resonance directions to incident waves having an operating frequency of the antenna part

Methodology Applied

Scientific EffectResonance: Resonance

Implementation Method 2

generating emitted waves having polarized waves different from those of electromagnetic waves transmitted/received by the antenna part

Methodology Applied

Scientific EffectPolarization: Polarisation

Data Source

PatentUS11088444B2Antenna device

Publication Date: 2021.08.10 DENSO CORP

AI summary

A dielectric substrate has a first surface formed with a base plate and a second surface formed with an antenna part. The antenna part has one or more antenna patterns. An additional function part has a plurality of conductor patterns arranged around the antenna part. The plurality of conductor patterns resonate in one or more resonance directions to incident waves having an operating frequency of the antenna part, thereby generating emitted waves having polarized waves different from those of electromagnetic waves transmitted/received by the antenna part. For each of the resonance directions, at least one of the conductor patterns includes at least one line pattern having a width which is narrower than the total width of the conductor patterns in the direction perpendicular to the resonance direction.