Graphene-Embedded Copper PCB Traces for High-Speed Signal Integrity

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Solution Overview

Problem

Conventional copper-based signal traces face limitations in effectively transmitting high-speed communications signals beyond 2 inches, leading to impracticality at speeds up to 112 Gbps, necessitating a migration to fiber, while seeking to enhance copper-based signal traces for sufficient conductivity to support high-speed communication signals.

Innovation Solution

Incorporating a graphene layer within the copper material at a depth below the surface of conductive signal structures, such as traces or wires, to increase conductivity and reduce signal loss, with the graphene layer remaining within the skin depth region even at high frequencies like 14 GHz or greater, thereby enhancing the performance of printed circuit boards for high-speed signaling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional copper-based signal traces are used, then manufacturing is simple and cost-effective, but signal transmission effectiveness deteriorates beyond 2 inches at high speeds up to 112 Gbps

Engineering Contradiction:

Improvesignal transmission effectivenessVSAvoidtrace length

Core Design Contradiction:

ReliabilityVSLength of stationary object

Solution Approach 1:

The patent embeds graphene layers within copper-based signal traces to create a composite material structure. The graphene layers are positioned at specific depths within the copper trace cross-section to optimize electrical conductivity and signal transmission performance while maintaining the structural integrity and manufacturing advantages of copper traces.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent applies local quality enhancement by embedding graphene layers only in specific regions within the copper trace cross-section, particularly targeting areas where electrical conductivity needs improvement. This localized approach enhances signal transmission effectiveness without requiring complete replacement of the copper trace structure.

Inventive Principle:

Principle #3Local quality

2Reliability

If copper-based signal traces are used, then ease of manufacture is maintained, but conductivity sufficiency deteriorates at high speeds requiring migration to fiber

Engineering Contradiction:

Improveconductivity sufficiencyVSAvoidmanufacturing complexity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent creates a composite structure by integrating graphene layers into copper traces, combining the high electrical conductivity of graphene with the structural advantages of copper. This composite approach enhances conductivity sufficiency for high-speed signals while maintaining compatibility with existing copper trace manufacturing processes.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent modifies the electrical conductivity parameter of copper traces by embedding graphene layers at optimized depths and concentrations. This parameter enhancement allows copper traces to achieve conductivity levels sufficient for high-speed communication without fundamental changes to manufacturing processes.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If graphene layer is embedded within copper material, then conductivity increases and trace loss reduces, but manufacturing precision requirements increase

Engineering Contradiction:

ImproveconductivityVSAvoidgraphene layer depth control

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent optimizes the depth parameter of embedded graphene layers within copper traces to balance conductivity enhancement with manufacturing feasibility. By carefully controlling the depth at which graphene layers are embedded, the patent achieves improved electrical conductivity while maintaining compatibility with existing manufacturing capabilities.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent develops a composite copper-graphene trace structure where the graphene layers are embedded at optimized depths within the copper matrix. This composite structure enhances conductivity while the copper material provides structural support and facilitates manufacturing processes.

Inventive Principle:

Principle #40Composite materials

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

The integration of graphene within copper signal traces significantly increases conductivity and reduces trace loss, enabling effective high-speed signaling up to 224 Gbps, making copper-based traces more practical for high-speed communications by maintaining the graphene layer within the skin depth region, thus supporting enhanced signal transmission.

Implementation Method 1

the graphene layer remaining within the skin depth region even at high frequencies like 14 GHz or greater

Methodology Applied

Scientific EffectSkin effect: Skin Effect

Data Source

PatentUS12160948B2Integrating graphene into the skin depth region of high speed communications signals for a printed circuit board

Publication Date: 2024.12.03 CISCO TECHNOLOGY INC

AI summary

A conductive signal transmission structure for a printed circuit includes a copper material and a graphene layer disposed within the copper material at a depth below a surface of the structure. The depth of the graphene layer is further within a skin depth region of the structure when a transmission signal applied to the conductive signal transmission structure has a signal speed of at least 112 Gbps and/or a Nyquist frequency that is at least about 14 gigahertz (GHz).