Antenna Shield Contact Structure for Stable Noise Suppression

Solution Overview

Problem

The existing method of soldering metal shield cases to circuit boards for antenna devices can lead to heat conduction issues, resulting in solder failures or variations, which compromise the shield's conductivity and fail to adequately suppress noise-related adverse effects on antenna characteristics.

Innovation Solution

An antenna device design featuring a base with a recessed portion acting as a shield case that contacts the circuit board, ensuring sufficient conductivity and noise suppression through secure contact means such as screws, leaf springs, or conductive cushions, reducing the risk of warpage and assembly errors.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If soldering is used to fix the metal shield case to the circuit board, then the shield case can be securely attached, but heat conduction causes solder failures or variations in solder amount, compromising conductivity

Engineering Contradiction:

Improveattachment strengthVSAvoidsolder reliability

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent replaces the thermal soldering process with a mechanical pressing system. A pressing device applies downward force through an upper pressing member that contacts the shield case, while a lower pressing member contacts the circuit board, creating a mechanical bond without heat conduction that would cause solder failures.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces a pressing device as an intermediary mechanism between the shield case and circuit board. This device includes pressing members that transmit mechanical force to achieve secure attachment, eliminating the need for direct thermal contact that causes reliability issues.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Strength

If soldering is used to fix the shield case, then attachment is achieved, but contact between shield case and circuit board becomes insufficient due to solder failure or variation, lowering conduction

Engineering Contradiction:

Improveattachment strengthVSAvoidcontact precision

Core Design Contradiction:

StrengthVSManufacturing precision

Solution Approach 1:

The patent replaces the thermal soldering process with a mechanical pressing system. A pressing device applies downward force through an upper pressing member that contacts the shield case, while a lower pressing member contacts the circuit board, creating a mechanical bond without heat conduction that would cause solder failures.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the attachment method from thermal (soldering) to mechanical (pressing). By controlling pressing force and duration as parameters, the system achieves consistent contact precision without the variations inherent in soldering processes.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If the shield case conductivity is compromised due to solder issues, then the shield function is insufficient, but noise suppression function is not adequately achieved, affecting antenna characteristics

Engineering Contradiction:

Improveshield function reliabilityVSAvoidnoise interference

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent replaces the thermal soldering process with a mechanical pressing system. A pressing device applies downward force through an upper pressing member that contacts the shield case, while a lower pressing member contacts the circuit board, creating a mechanical bond without heat conduction that would cause solder failures.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces a pressing device as an intermediary mechanism between the shield case and circuit board. This device includes pressing members that transmit mechanical force to achieve secure attachment, eliminating the need for direct thermal contact that causes reliability issues.

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 design effectively maintains a stable contact area, enhancing conductivity and reducing noise interference on antenna characteristics while minimizing component count and manufacturing costs.

Implementation Method 1

a base covering at least a part of the circuit portion and provided with a recessed portion functioning as a shield case

Methodology Applied

Scientific EffectElectromagnetic shielding: Faraday Cage

Implementation Method 2

a contact means for bringing the recessed portion and the circuit board into contact with each other

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentUS20240429597A1Antenna device

Publication Date: 2024.12.26 YOKOWO CO LTD

AI summary

To provide an antenna device capable of suppressing an adverse effect on antenna characteristics and the like due to noise. The antenna device includes: an antenna element, a circuit board including a circuit portion, a base covering at least a part of the circuit portion and provided with a recessed portion functioning as a shield case, and a contact means for bringing the recessed portion and the circuit board into contact with each other.