Antenna Capacitor for Metallic Device Noise

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Solution Overview

Problem

Electronic devices with metallic exteriors face challenges in maintaining antenna radiation efficiency due to radiation degradation caused by peripheral metallic members, requiring solutions to enhance antenna performance while minimizing noise interference in various frequency bands.

Innovation Solution

The integration of a substrate with an antenna radiator, a metallic member, a connector member electrically connected to the substrate, and a dielectric capacitor that switches between open and short states based on frequency response characteristics to block noise in low frequency bands and enhance radiation in high frequency bands.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a metallic member is disposed near the antenna radiator to enhance exterior appearance and rigidity, then the aesthetic quality and structural strength are improved, but radiation degradation occurs due to electromagnetic interference from the metallic material

Engineering Contradiction:

ImproverigidityVSAvoidantenna radiation efficiency

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

A dielectric member is introduced as an intermediary between the metallic member and the antenna radiator. This dielectric member prevents direct electromagnetic interference from the metallic material while maintaining the structural rigidity and aesthetic appearance provided by the metallic exterior.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The harmful electromagnetic interference effect is extracted and isolated by positioning the dielectric member to block the interference path, separating the beneficial structural function of the metallic member from its harmful radiation-degrading effect.

Inventive Principle:

Principle #2Taking out (Extraction)

2Length of moving object

If the antenna radiator is made slimmer to meet consumer demand for thinner devices, then the device thickness is reduced, but the mounting space for the antenna radiator is decreased leading to radiation performance degradation

Engineering Contradiction:

Improvedevice thicknessVSAvoidantenna radiation efficiency

Core Design Contradiction:

Length of moving objectVSReliability

Solution Approach 1:

The dielectric member acts as a mediator that enables the antenna radiator to maintain optimal radiation performance even in the reduced space of slim devices. It improves the electromagnetic field distribution around the antenna without requiring additional mounting space.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Strength

If peripheral metallic members are used to form the exterior of the electronic device, then the aesthetic quality and durability are enhanced, but noise interference in low frequency bands increases causing radiation degradation

Engineering Contradiction:

Improveexterior durabilityVSAvoidnoise interference

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The dielectric member serves as a shield that blocks noise interference from the metallic members while preserving the exterior durability and aesthetic quality. It specifically targets and attenuates low frequency band noise that would otherwise degrade antenna radiation.

Inventive Principle:

Principle #24Intermediary (Mediator)

4Adaptability or versatility

If multiple antenna radiators are mounted to support various communication bands, then the communication functionality is improved, but the volume and complexity of the antenna system increase

Engineering Contradiction:

Improvecommunication band coverageVSAvoidantenna system volume

Core Design Contradiction:

Adaptability or versatilityVSVolume of stationary object

Solution Approach 1:

The dielectric member provides universal benefit to multiple antenna radiators simultaneously, enabling a single dielectric component to support various communication bands (GSM, LTE, Bluetooth, GPS, WiFi) without requiring separate interference mitigation structures for each antenna.

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 configuration improves antenna efficiency by reducing radiation degradation and noise interference, particularly in low frequency bands, while maintaining optimal performance across different communication bands.

Implementation Method 1

The capacitor is opened from the at least one metallic member in a low frequency band and shorted to the at least one metallic member in a high frequency band according to frequency response characteristics of the capacitor

Methodology Applied

Scientific EffectCapacitance frequency response: Capacitance

Implementation Method 2

a capacitor formed by a dielectric interposed between the connector member and the at least one metallic member

Methodology Applied

Scientific EffectDielectric property: Dielectric

Data Source

PatentUS10468750B2Antenna and electronic device including the same

Publication Date: 2019.11.05 SAMSUNG ELECTRONICS CO LTD

AI summary

Provided are an antenna and an electronic device including the same. The antenna includes a substrate, an antenna radiator fed from the substrate, at least one metallic member disposed near the antenna radiator, a connector member electrically connected to the substrate, and a capacitor formed by a dielectric interposed between the connector member and the at least one metallic member.