Rigid-Flex Port Connection Layout for Low-Loss Network Signals

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Solution Overview

Problem

Conventional mechanisms for connecting processors to port connectors in network devices exhibit poor signal loss behavior, making it challenging to maintain effective signal integrity.

Innovation Solution

The use of a rigid-flex circuit with a first and second rigid portion and a flexible portion joined between them, mounted on opposite sides of a printed circuit board, allows processors to be communicatively coupled to port connectors through conductive vias and conductive elastomer, reducing signal loss and improving signal integrity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If conventional connection mechanisms are used to connect processors to port connectors, then device complexity is reduced, but signal loss increases

Engineering Contradiction:

Improvesignal lossVSAvoidconnection mechanism complexity

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

The connection mechanism is segmented into multiple functional components: rigid portions for stable mounting, flexible portions for signal routing, conductive vias for vertical connections, and conductive elastomer for compliant interfacing. This segmentation allows each component to be optimized for its specific function, reducing overall signal loss while distributing complexity across manageable segments.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The solution employs composite construction combining rigid circuit board materials with flexible circuit materials, conductive metals, and elastomeric materials. This composite approach enables the connection mechanism to simultaneously provide mechanical stability, electrical conductivity, and flexibility, thereby reducing signal loss without excessive complexity increase.

Inventive Principle:

Principle #40Composite materials

2Reliability

If rigid connections are used to connect processors to port connectors, then signal integrity is improved, but adaptability to different configurations is reduced

Engineering Contradiction:

Improvesignal integrityVSAvoidconnection configuration adaptability

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The connection mechanism incorporates dynamic elements including flexible circuit portions that can bend and conform, and conductive elastomer that provides compliant electrical contact. These dynamic components maintain reliable signal integrity while adapting to different mechanical configurations and tolerances, resolving the contradiction between rigidity and adaptability.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

Flexible circuit portions and thin conductive elastomer layers are used to create connections that maintain electrical integrity while accommodating mechanical variations. These flexible elements provide the necessary adaptability for different configurations while preserving signal integrity through controlled impedance and consistent electrical contact.

Inventive Principle:

Principle #30Flexible shells and thin films

3Adaptability or versatility

If flexible connections are used to connect processors to port connectors, then adaptability is improved, but signal loss increases

Engineering Contradiction:

Improveconnection configuration adaptabilityVSAvoidsignal loss

Core Design Contradiction:

Adaptability or versatilityVSLoss of energy

Solution Approach 1:

Different portions of the connection mechanism have different properties optimized for their specific functions: rigid portions for mechanical stability, flexible portions for adaptability, and conductive regions for optimal electrical performance. This local quality differentiation allows flexible connections to provide adaptability while minimizing signal loss through carefully designed conductive paths and material selection in critical signal areas.

Inventive Principle:

Principle #3Local quality

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 minimizes signal loss and enhances signal integrity by providing flexible and rigid connections that optimize signal paths, thereby improving network device performance.

Implementation Method 1

The conductive elastomer can be coupled to the second side of the printed circuit board and to the first rigid portion of the rigid-flex circuit

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentEP4598283A1Network device having port connections with reduced signal loss

Publication Date: 2025.08.06 ARISTA NETWORKS INC

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Figure 3A~3B

AI summary

A network device or a system can include a printed circuit board, an integrated circuit mounted on a first side of the printed circuit board, a rigid-flex circuit having a first rigid portion, a second rigid portion, and a flexible portion joined between the first and second rigid portions, and port connectors mounted on the second rigid portion of the rigid-flex circuit. The first rigid portion of the rigid-flex circuit can be disposed on a second side, opposing the first side, of the printed circuit board. The rigid-flex circuit is configured to communicatively couple the integrated circuit to the port connectors. The network device can include alignment structures for positioning the printed circuit board and the rigid-flex circuit within a housing of the device.