Antenna Device with Auxiliary Loop Conductor for Compact Integration

Solution Overview

Problem

In near field radio communication systems, coil antennas are hindered by adjacent ground conductors or metallic members, leading to reduced communication distances due to magnetic field interference.

Innovation Solution

The use of an antenna device with a coil antenna and an auxiliary loop conductor on an insulating substrate, where the coil conductor's winding axis is parallel to the substrate, and the auxiliary loop conductor generates a magnetic flux in phase with the coil antenna, reducing interference from adjacent conductive members.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If a coil antenna is disposed adjacent to a ground conductor pattern or metallic member, then the antenna can be compactly integrated into the electronic apparatus, but magnetic field generation is hindered and communication distance significantly decreases

Engineering Contradiction:

Improveantenna integration compactnessVSAvoidcommunication distance

Core Design Contradiction:

Volume of moving objectVSLength of moving object

Solution Approach 1:

The patent introduces a magnetic shielding member as an intermediary component positioned between the coil antenna and the ground conductor pattern or metallic member. This shielding member acts as a mediator that blocks or redirects magnetic flux from reaching the conductive surfaces, thereby preventing magnetic field hindrance while allowing the antenna to maintain its compact integration adjacent to these structures

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent converts the potentially harmful effect of adjacent conductive structures (which normally hinder magnetic field generation) into a beneficial configuration by strategically positioning the magnetic shielding member. The shielding member transforms the harmful magnetic flux interaction into a controlled configuration where the magnetic field is redirected through the shielding member rather than being blocked by the conductive surfaces, thus maintaining communication distance despite compact integration

Inventive Principle:

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

2Stability of the object's composition

If a metal body is disposed below the coil antenna to maintain resonant frequency, then frequency stability is ensured, but magnetic flux is still hindered by the metal surface and communication distance remains limited

Engineering Contradiction:

Improveresonant frequency stabilityVSAvoidcommunication distance

Core Design Contradiction:

Stability of the object's compositionVSLength of moving object

Solution Approach 1:

The patent introduces a magnetic shielding member as an intermediary component positioned between the coil antenna and the ground conductor pattern or metallic member. This shielding member acts as a mediator that blocks or redirects magnetic flux from reaching the conductive surfaces, thereby preventing magnetic field hindrance while allowing the antenna to maintain its compact integration adjacent to these structures

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent converts the potentially harmful effect of adjacent conductive structures (which normally hinder magnetic field generation) into a beneficial configuration by strategically positioning the magnetic shielding member. The shielding member transforms the harmful magnetic flux interaction into a controlled configuration where the magnetic field is redirected through the shielding member rather than being blocked by the conductive surfaces, thus maintaining communication distance despite compact integration

Inventive Principle:

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

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 significantly reduces magnetic field hindrance, maintaining stable antenna characteristics and extending communication distances even when adjacent conductive members are present.

Implementation Method 1

an auxiliary loop conductor that is connected to the coil conductor and generates a magnetic flux that is in phase with that of the coil antenna

Methodology Applied

Scientific EffectElectromagnetic Induction: Electromagnetic Induction

Data Source

PatentUS10224632B2Antenna device and electronic apparatus

Publication Date: 2019.03.05 MURATA MFG CO LTD

AI summary

An insulating substrate including a principal surface and coil antennas disposed on the substrate and each including a coil conductor. The coil conductor includes a winding axis in a direction parallel or substantially parallel to the principal surface of the substrate. An auxiliary loop conductor that is connected to the coil conductors of the coil antennas and generates a magnetic flux that is in phase with those of the coil antennas as seen from the direction of the winding axis of the coil conductor is provided in and on the substrate.