Insulating Member Arrangement for FPCB Noise Coupling Reduction

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Noise coupling between the flexible printed circuit board (FPCB) and the conductive sheet in electronic devices leads to deterioration of radio frequency (RF) communication performance and emission of electro-magnetic interference (EMI) noise.

Innovation Solution

An insulating member is disposed on one surface of the FPCB and contacts the conductive sheet, preventing noise generation from signal and power components of the FPCB and reducing noise coupling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the FPCB is disposed adjacent to the conductive sheet to transmit signals and power, then the electrical connection between PCB portions is achieved, but noise coupling occurs between the FPCB and conductive sheet deteriorating RF communication performance

Engineering Contradiction:

Improveelectrical connectionVSAvoidnoise coupling

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

An insulating member is introduced as an intermediary between the FPCB and the conductive sheet. This insulating member prevents direct contact while allowing the FPCB to maintain its signal transmission function, thereby blocking the noise coupling path without compromising electrical connection capability.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The harmful noise coupling effect is extracted and isolated by positioning the insulating member to specifically target the interaction zone between the FPCB and conductive sheet. This allows the beneficial electrical connection function to remain while removing the harmful noise transmission path.

Inventive Principle:

Principle #2Taking out (Extraction)

2Volume of moving object

If the FPCB and conductive sheet are disposed adjacent to each other for compact design, then space utilization is improved, but EMI noise emission occurs disrupting surrounding electronic equipment

Engineering Contradiction:

Improvespace utilizationVSAvoidEMI noise emission

Core Design Contradiction:

Volume of moving objectVSObject-generated harmful factors

Solution Approach 1:

The insulating member serves as a mediator that allows the compact adjacent arrangement of FPCB and conductive sheet to be maintained for space efficiency, while simultaneously preventing the generation and emission of EMI noise by blocking the electromagnetic interaction between the two components.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The insulating member converts the potentially harmful electromagnetic interaction between adjacent FPCB and conductive sheet into a beneficial configuration where compact spacing is achieved without EMI emission, effectively transforming a harmful proximity into a safe arrangement.

Inventive Principle:

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

Data Source

PatentUS12328811B2Insulating member arrangement structure and electronic device including the same

Publication Date: 2025.06.10 SAMSUNG ELECTRONICS CO LTD

AI summary

An electronic device is disclosed, including: a housing including a first surface, a second surface parallel to the first surface, and a side surface surrounding a space formed between the first surface and the second surface, a first printed circuit board (PCB) disposed on the first surface of the housing, a second PCB disposed on the first surface of the housing and spaced apart from the first PCB, a flexible printed circuit board (FPCB) connecting the first PCB and the second PCB, a conductive sheet disposed on the second surface of the housing and spaced apart from the first PCB, the second PCB, and the FPCB, and an insulating member disposed on one surface of the FPCB and contacting the conductive sheet.