Twin Axial Cable Structures for Signal Integrity
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Solution Overview
Problem
Conventional cable structures for differential signaling face challenges in minimizing signal losses and enhancing signal quality due to the limitations of materials that can be extruded, particularly with non-extrudable insulative materials like expanded polyethylene (ePE) and expanded polytetrafluoroethylene (ePTFE) being difficult to incorporate.
Innovation Solution
A cable structure is developed using insulative materials like polyethylene, polytetrafluoroethylene, and expanded polytetrafluoroethylene, which are not extruded, featuring parallel open channels for conductive wires, a conductive sheet for shielding, and grounding elements to reduce signal losses and improve signal quality, allowing for the transmission of multiple differential signals with minimal interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional extrusion processes are used to manufacture cable structures, then manufacturing ease and cost are improved, but signal quality deteriorates due to inability to use non-extrudable insulative materials
Solution Approach 1:
The cable structure is divided into separate components: the insulative body portion is formed first, then channels are cut through it, and conductive wires are inserted into the channels. This segmentation allows the use of non-extrudable materials like ePE and ePTFE for the insulative body while maintaining manufacturing feasibility through subsequent assembly steps.
Solution Approach 2:
Instead of forming the insulative material through extrusion and then shaping it, the invention inverts the process by first forming the insulative body portion and then cutting channels through it. This reversal enables the use of materials that cannot be extruded, such as expanded polyethylene and expanded PTFE, thereby improving signal quality without sacrificing manufacturing capability.
2Reliability
If non-extrudable insulative materials like ePE and ePTFE are used, then signal quality is improved by reducing signal losses, but manufacturing complexity increases
Solution Approach 1:
The manufacturing process is segmented into distinct operations: forming the insulative body portion, cutting channels through it, inserting conductive wires, and applying shielding. This segmentation simplifies each individual step while enabling the use of non-extrudable materials, thereby reducing overall manufacturing complexity despite the advanced material requirements.
Solution Approach 2:
The insulative body portion is prepared in advance with channels cut through it before the conductive wires are inserted. This preliminary action simplifies the final assembly process and allows for the use of non-extrudable materials without significantly increasing manufacturing complexity, as the channels are pre-formed to receive the wires.
3Productivity
If multiple differential signals are transmitted within the same cable structure, then productivity is improved, but signal interference increases
Solution Approach 1:
Each channel in the insulative body portion is designed with specific local properties, including the insertion of conductive wires into individual channels and the application of conductive shielding material around the channels. This local quality control allows multiple differential signals to be transmitted simultaneously while minimizing cross-talk and interference between adjacent channels.
Solution Approach 2:
A conductive shielding material is introduced as an intermediary element between the conductive wires carrying different differential signals. This shielding acts as a mediator that isolates the electromagnetic fields of adjacent signal pairs, thereby enabling high-productivity multi-signal transmission while reducing harmful interference between signals.
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 approach reduces signal losses and enhances signal quality by utilizing non-extrudable materials, enabling efficient transmission of high-speed differential signals with improved noise resilience and cost-effectiveness.
Implementation Method 1
a conductive sheet disposed on the insulative body portion and configured to shield the pair of conductive wires
Implementation Method 2
a grounding element in contact with the conductive sheet and configured to conduct electric current away from the conductive sheet
Data Source
AI summary
A twin axial cable structure is provided for transmitting signals that makes use of insulative materials that are not easily extruded, such as expanded polyethylene (ePE) and expanded polytetrafluoroethylene (ePTFE). The cable structure includes an insulative body portion having a pair of open channels defined through an outer longitudinal surface of the insulative body portion, in which are disposed a pair of conductive wires. A conductive sheet is disposed on the insulative body portion, and a grounding element is placed in contact with the conductive sheet, such as by applying planar conductive sheets and grounding elements and/or ground wires to the insulative body portion. Corresponding methods and apparatuses for manufacturing the same are also provided. The cable structures, methods, and apparatuses described herein can produce a cable structure for transmitting multiple differential signals within the same structure, with minimal negative effects on other, neighboring transmissions.