Resonance Trace Loop for Printed Board Noise Isolation

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Solution Overview

Problem

Existing printed boards fail to adequately reduce the propagation of electromagnetic noise from frame ground traces to circuit members, particularly when high-frequency noise is present, leading to potential malfunctions in circuit components.

Innovation Solution

Incorporating a resonance trace between the frame ground trace and the circuit member with a gap, connected at multiple positions to form a closed loop, which confines electromagnetic noise and prevents its propagation to the circuit member.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the frame ground trace is electrically connected to the signal ground trace via a connecting component, then electrical connectivity is improved, but electromagnetic noise propagates through the connecting component to circuit members

Engineering Contradiction:

Improveelectrical connectivityVSAvoidelectromagnetic noise propagation

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The invention divides the ground trace system into separate frame ground trace and signal ground trace that do not directly connect. A resonance trace is introduced as a separate segment that is spaced from the frame ground trace with a gap, preventing direct electrical connection while maintaining functional separation between frame ground and signal ground systems.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The resonance trace acts as an intermediary element between the frame ground trace and circuit members. It is connected to the circuit member at at least two positions but maintained at a gap distance from the frame ground trace, serving as a mediator that allows electromagnetic noise to be confined and dissipated without directly transmitting it to sensitive circuit members.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If gaps are introduced between traces to reduce electromagnetic noise, then noise propagation is reduced, but electrical connectivity and signal integrity deteriorate

Engineering Contradiction:

Improveelectromagnetic noise propagationVSAvoidelectrical connectivity

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The invention applies different spatial relationships to different trace segments. The resonance trace is positioned with a gap from the frame ground trace in the region where electromagnetic noise is present, while maintaining proper electrical connections to the circuit member where connectivity is required. This local differentiation allows gap introduction only where needed for noise reduction.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The resonance trace is connected to the circuit member at multiple positions, creating a distributed connection pattern that maintains electrical connectivity through alternative pathways while the gap from the frame ground trace provides noise isolation in the spatial dimension.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Reliability

If conventional grounding methods are used, then electrical connectivity is maintained, but high-frequency electromagnetic noise causes circuit malfunctions

Engineering Contradiction:

Improveelectrical connectivityVSAvoidhigh-frequency electromagnetic noise

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The resonance trace is designed to resonate at specific frequencies, creating controlled electromagnetic resonance that confines high-frequency noise within the loop member formed by the resonance trace and circuit member connections. This resonance effect dissipates high-frequency energy without allowing it to propagate to sensitive circuit members.

Inventive Principle:

Principle #18Mechanical vibration

Solution Approach 2:

The invention changes the electrical parameters of the grounding system by introducing a resonant element with specific inductance and capacitance characteristics. The resonance trace, when connected at multiple positions to the circuit member, creates a resonant circuit that alters the impedance characteristics at high frequencies, thereby confining and dissipating electromagnetic noise while maintaining low-frequency connectivity.

Inventive Principle:

Principle #35Parameter changes

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 effectively reduces the amount of electromagnetic noise propagating to the circuit member, mitigating the risk of malfunctions and ensuring stable operation even under high-frequency noise conditions.

Implementation Method 1

The resonance trace and the circuit member together form a loop member configured in the form of a closed circuit of the resonance trace and the circuit member

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS10912187B2Printed board

Publication Date: 2021.02.02 MITSUBISHI ELECTRIC CORP

AI summary

A printed board including an external interface, a frame ground trace electrically connected to the external interface, a circuit member spaced from the frame ground trace, and a resonance trace disposed between the frame ground trace and the circuit member with a gap present between the resonance trace and the frame ground trace. The resonance trace is connected to the circuit member at at least two positions. The resonance trace and the circuit member together form a loop member configured in the form of a closed circuit of the resonance trace and the circuit member.