Magnetic Antenna Framework for Earphone Shell

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Solution Overview

Problem

Conventional Bluetooth earphone antennas with electric frameworks experience frequency band deviation due to the human body's dielectric properties, affecting efficiency and requiring additional clearance space on circuit boards.

Innovation Solution

The earphone module employs a magnetic antenna framework with a slot antenna design, where a first slot between radiators and an insulating member enhances antenna efficiency by minimizing resonant mode interference from the human body and eliminates the need for antenna clearance areas on circuit boards.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If an electric antenna framework is used in the earphone module, then the antenna can be disposed in the shell, but frequency band deviation occurs due to human body dielectric affecting antenna efficiency

Engineering Contradiction:

Improveantenna efficiencyVSAvoidfrequency band deviation

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the fundamental parameter of antenna type from electric field-based to magnetic field-based. The magnetic antenna framework uses magnetic flux distribution instead of electric field distribution, which fundamentally alters how the antenna interacts with the human body dielectric, thereby eliminating frequency band deviation and improving antenna efficiency

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent substitutes the electric field mechanism with a magnetic field mechanism. By replacing the electric antenna framework with a magnetic antenna framework, the system uses magnetic coupling and magnetic flux confinement instead of electric field radiation, which reduces sensitivity to human body dielectric effects and eliminates frequency band deviation

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Device complexity

If an electric antenna framework is used, then the antenna can be integrated in the shell, but additional clearance space is required on circuit boards

Engineering Contradiction:

Improveantenna integrationVSAvoidclearance space on circuit board

Core Design Contradiction:

Device complexityVSArea of stationary object

Solution Approach 1:

The patent merges the antenna framework with the shell structure itself. The magnetic antenna framework is formed by conductive portions of the shell (such as the housing body and earpiece component), eliminating the need for separate antenna components and clearance spaces on circuit boards. The shell becomes the antenna, integrating multiple functions into a single structure

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent makes the shell serve multiple functions: it provides structural protection, housing for components, and simultaneously acts as the magnetic antenna framework. The conductive portions of the shell perform both structural and electromagnetic functions, eliminating the need for dedicated antenna clearance areas on circuit boards

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 design improves antenna efficiency and allows for a larger touch panel area and better impedance matching, optimizing radiation performance across the Bluetooth frequency band while reducing frequency deviation and space constraints.

Implementation Method 1

The antenna structure couples out a frequency band, and a length of the first slot is two-thirds of a wavelength of the frequency band

Methodology Applied

Scientific EffectElectromagnetic coupling: Electromagnetic Induction

Implementation Method 2

Since its resonant mode is less likely to be affected by the human body, the antenna efficiency is enhanced

Methodology Applied

Scientific EffectResonance: Resonance

Implementation Method 3

a shell of the earphone module forms a magnetic antenna framework

Methodology Applied

Scientific EffectMagnetic field generation: Magnetic Field

Data Source

PatentUS20220345804A1Earphone module

Publication Date: 2022.10.27 MERY ELECTRONICS CO LTD

AI summary

An earphone module includes an antenna structure. The antenna structure includes a first radiator, a second radiator, a conductive member, and a first insulating member. The first radiator includes a feeding end. The second radiator includes a ground end, and a first slot is formed between the first radiator and the second radiator. The conductive member is connected to the first radiator and the second radiator. The first insulating member is disposed in the first slot. The first radiator, the second radiator, the conductive member, and the first insulating member collectively serve as at least a part of a shell of the earphone module.