Antenna Conductor Structure for Reflected Wave Suppression

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing antenna designs face a decrease in electromagnetic wave amplitude due to phase shift and reflection from metallic conductors, which affects wireless communication efficiency.

Innovation Solution

A structure comprising a first conductor, a second conductor, a third conductor for capacitive connection, and a fourth conductor with a resist layer, arranged to minimize the impact of reflected waves by creating an artificial magnetic conductor, reducing phase shift and maintaining wave amplitude.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If the distance between the antenna and the metallic conductor is set to be 1/4 of a wavelength, then the influence of reflected waves is reduced, but the device complexity increases due to precise spacing requirements

Engineering Contradiction:

Improveinfluence of reflected wavesVSAvoidprecise spacing requirements

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent introduces a resistive sheet as an intermediary layer between the antenna and the metallic conductor. This resistive sheet with specific surface resistance (typically around 377 ohms) acts as a mediator that absorbs and dissipates the reflected electromagnetic energy, preventing it from interfering with the antenna operation. The intermediary layer eliminates the need for precise 1/4 wavelength spacing while still reducing reflected wave influence.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the parameter of the intermediate layer by introducing a resistive sheet with controlled surface resistance. Instead of relying on the geometric parameter (distance = 1/4 wavelength), the solution transforms the problem into controlling the electrical parameter (surface resistance) of the intermediate material. This parameter change allows flexibility in spacing while maintaining performance.

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If an artificial magnetic conductor is used to reduce the influence of reflected light, then the harmful effects are reduced, but the device complexity and manufacturing difficulty increase

Engineering Contradiction:

Improvereflected wave influenceVSAvoidmanufacturing difficulty

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The patent employs a simple resistive sheet that can be manufactured using conventional techniques such as painting, spraying, or laminating resistive material onto a substrate. This approach uses inexpensive, easily manufactured materials compared to complex artificial magnetic conductor structures. The resistive sheet can be applied as a disposable or easily replaceable component, significantly reducing manufacturing complexity.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Volume of moving object

If the antenna is placed close to a metallic conductor, then the device size is reduced, but the amplitude of electromagnetic waves decreases due to phase shift and reflection

Engineering Contradiction:

Improvedevice sizeVSAvoidamplitude decrease

Core Design Contradiction:

Volume of moving objectVSLoss of energy

Solution Approach 1:

The resistive sheet serves as an intermediary that allows the antenna to be placed close to the metallic conductor without suffering from reflection issues. The sheet absorbs the reflected energy, enabling compact device design while maintaining electromagnetic wave amplitude. This intermediary layer decouples the antenna from the harmful effects of the nearby conductor.

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 reduces the influence of reflected waves, maintaining the amplitude of electromagnetic waves and enhancing wireless communication efficiency by utilizing an artificial magnetic conductor configuration.

Implementation Method 1

a third conductor that is configured to capacitively connect the first conductor and the second conductor

Methodology Applied

Scientific EffectCapacitance: Capacitance

Implementation Method 2

a first resist layer that covers the fourth conductor. The fourth conductor includes a plurality of first areas exposed to outside via a plurality of through holes of the first resist layer

Methodology Applied

Scientific EffectElectrical Resistance: Electrical Resistance

Data Source

PatentUS11831082B2Structure, antenna, wireless communication module, and wireless communication device

Publication Date: 2023.11.28 KYOCERA CORP

AI summary

A structure includes: a first conductor that extends in a second direction; a second conductor that faces the first conductor in a first direction and that extends along the second direction; a third conductor configured to capacitively connect the first conductor and the second conductor; a fourth conductor that is electrically connected to the first conductor and the second conductor, and that extends along a first plane; and a first resist layer that covers the fourth conductor. The fourth conductor includes a plurality of first areas exposed to outside via a plurality of through holes of the first resist layer. Each of the first conductor and the second conductor includes one or more second areas. The first resist layer extends on the first conductor and the second conductor to cover the fourth conductor, excluding the second areas. The first areas and the second areas are arranged along the first plane.