Porous Polypropylene Cable Dielectric for High-Speed Signal Stability

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Solution Overview

Problem

Existing electrical cables face challenges in achieving high signal propagation speeds and maintaining mechanical integrity due to the temperature sensitivity of conventional dielectric materials like polyethylene and PTFE, which compromise signal quality and flexibility.

Innovation Solution

Utilizing a linearly-stretched polypropylene film with a porous structure and trapped air molecules to form a dielectric layer, which is cross-linked to reduce temperature sensitivity and enhance porosity, resulting in a lower dielectric constant and improved signal propagation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If conventional dielectric materials like polyethylene and PTFE are used, then the cable structure is simple and easy to manufacture, but the signal propagation speed is limited and temperature sensitivity compromises signal quality

Engineering Contradiction:

Improvesignal propagation speedVSAvoiddielectric layer structure complexity

Core Design Contradiction:

SpeedVSDevice complexity

Solution Approach 1:

The patent applies porous materials by using a linearly-stretched polypropylene film with a porous structure containing trapped air molecules as the dielectric layer. The porosity is achieved through linear stretching of the polypropylene film, which creates voids filled with air. This porous structure reduces the dielectric constant and enables signal propagation speeds exceeding 90% of the speed of light, directly resolving the contradiction between achieving high speed and maintaining structural simplicity.

Inventive Principle:

Principle #31Porous materials

Solution Approach 2:

The patent employs composite materials by combining polypropylene with trapped air molecules to form a composite dielectric structure. The linearly-stretched polypropylene film creates a composite material system where the polypropylene matrix and air voids work together to achieve low dielectric constant and high signal propagation speed. This composite approach allows the dielectric layer to maintain mechanical integrity while achieving superior electrical performance.

Inventive Principle:

Principle #40Composite materials

2Reliability

If conventional dielectric materials are used, then the manufacturing process is simple, but temperature sensitivity compromises signal quality and flexibility

Engineering Contradiction:

Improvesignal quality stability at elevated temperaturesVSAvoiddielectric layer manufacturing complexity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent applies parameter changes by linearly stretching the polypropylene film to transform its physical structure. The linear stretching process changes the molecular orientation and creates the porous structure with trapped air molecules. This parameter change (structural transformation through stretching) enhances the dielectric properties and reduces temperature sensitivity, while the stretching process itself is a relatively simple manufacturing step that can be integrated into existing production lines.

Inventive Principle:

Principle #35Parameter changes

3Speed

If the dielectric layer uses trapped air molecules in porous structure, then signal propagation speed exceeds 90% of speed of light, but the mechanical integrity and flexibility are compromised

Engineering Contradiction:

Improvesignal propagation speedVSAvoidmechanical integrity of dielectric layer

Core Design Contradiction:

SpeedVSStrength

Solution Approach 1:

The patent applies flexible shells and thin films by using a linearly-stretched polypropylene film as the dielectric structure. The film format provides inherent flexibility, and the linear stretching creates a structure that maintains mechanical integrity while accommodating the porous structure with trapped air molecules. This approach enables the dielectric layer to maintain flexibility and mechanical strength despite the presence of voids, resolving the contradiction between high signal propagation speed and mechanical integrity.

Inventive Principle:

Principle #30Flexible shells and thin films

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 solution achieves signal propagation speeds exceeding 90% of the speed of light with reduced distortion and flexibility, while maintaining structural integrity, even at elevated temperatures.

Implementation Method 1

a linearly-stretched polypropylene film having a porous structure that includes a plurality of pores that extend through a thickness of the linearly-stretched polypropylene film

Methodology Applied

Scientific EffectPorosity: Porosity

Implementation Method 2

The linearly-stretched polypropylene film is cross-linked

Methodology Applied

Scientific EffectCross-linking:

Data Source

PatentUS12518894B2Electrical cable with dielectric film

Publication Date: 2026.01.06 SWIFT BRIDGE TECH (M) SDN BHD

AI summary

A cable includes an inner conductor and a dielectric layer extending around the inner conductor. The dielectric layer includes a linearly-stretched polypropylene film having a porous structure that includes a plurality of pores that extend through a thickness of the linearly-stretched polypropylene film. The dielectric layer includes air molecules trapped within the pores of the linearly-stretched polypropylene film such that the dielectric layer includes polypropylene and air. The cable includes an outer conductor extending around the dielectric layer.