Cable Assembly Impedance Matching via Wound Electroconductive Tape
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Solution Overview
Problem
Existing cable assemblies face challenges in manufacturing efficiency and impedance matching due to the need for heat-shrinkable tubes, which require time and effort to apply, leading to impedance mismatches at the protruding ends of signal and drain wires.
Innovation Solution
A cable assembly featuring an electroconductive member, such as a plate or tape, is wound around the protruding portions of the wires to lower impedance and facilitate easy manufacturing, allowing for matched impedances between the protruding and inner portions of the wires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If heat-shrinkable tubes are used to cover the protruding end portions of signal and drain wires, then impedance mismatch is suppressed, but manufacturing time and effort increase
Solution Approach 1:
The patent extracts the essential function of the heat-shrinkable tube (impedance matching) and implements it through a simpler structure - an electroconductive plate or tape wound around the protruding wire portions. This removes the complex heating and shrinking process while maintaining the impedance matching effect through the electroconductive layer's proximity to the signal wires.
Solution Approach 2:
The patent replaces the thermal-mechanical system (heating and shrinking of heat-shrinkable tubes) with a simpler electrostatic field-based solution. The electroconductive plate or tape creates a controlled electrostatic environment around the protruding wires, achieving impedance matching without requiring thermal processing equipment or complex mechanical shrinking operations.
2Manufacturing precision
If heat-shrinkable tubes are used to cover the protruding end portions of signal and drain wires, then impedance mismatch is suppressed, but manufacturing complexity increases
Solution Approach 1:
The patent employs simple, easily applicable electroconductive plates or tapes that can be quickly wrapped around the protruding wire portions. These components are simpler and less complex than heat-shrinkable tubes, requiring no special storage conditions, no heating equipment, and can be applied manually or with simple automation, thereby reducing manufacturing process complexity.
3Productivity
If the protruding end portions of signal and drain wires are left uncovered, then manufacturing is simpler, but impedance mismatch occurs
Solution Approach 1:
The patent applies the electroconductive plate or tape only to the specific locations where impedance matching is needed - the protruding end portions of the signal and drain wires. This localized application maintains manufacturing efficiency by not requiring complete cable coverage, while precisely addressing the impedance mismatch problem only where it occurs at the exposed wire ends.
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 reduces manufacturing time and effort while achieving matched impedances, improving the cable assembly's performance and ease of production.
Implementation Method 1
The protruding end portions of the signal and drain wires, excluding tip portions of the end portions, are received in and covered with the heat-shrinkable tube... suppresses impedance increases at the end portions of the signal and drain wires to match between the end portions and other portions
Data Source
Figure 1A
Figure 1B~2B
Figure 3A~3B
AI summary
[Problem] Objects of the invention are to provide a cable assembly with reduced characteristic impedance at a protruding end portion of a first wire of a cable and configured for easy manufacture, and to provide a method for manufacturing the cable assembly. [Configuration] A cable assembly A1 includes a terminal 400a, a cable 100, and an electroconductive member 200. The cable 100 includes an outer insulator 100, a shield conductor 120 inside the outer insulator 110, and at least one first wire 130a being a signal wire inside the shield conductor 120. The first wire 130a includes a protruding portion Pa protruding in the Y-Y' direction from the shield conductor 120 and the outer insulator 110. The electroconductive member 200 is an electroconductive plate or electroconductive tape wound around at least a part in the Y-Y' direction of the protruding portion Pa.