Conductive Sleeve Impedance Control for Twinax Cable Termination
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Solution Overview
Problem
The termination region of twinax cables experiences impedance mismatch when the conductive foil is removed for connectorization, leading to inefficient signal transmission and increased crosstalk.
Innovation Solution
A conductive sleeve with a capacitive section is used to maintain impedance control by forming a capacitive shorting circuit with the cable's insulator and drain wire, ensuring a continuous ground reference and reducing crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the conductive foil is removed in the termination region for connectorization, then the cable can be connected to connectors, but the impedance match is disturbed and impedance control is lost
Solution Approach 1:
A conductive sleeve is introduced as an intermediary component in the termination region. The sleeve maintains the conductive path and impedance control where the original conductive foil was removed, allowing both connectorization and impedance matching to coexist. The sleeve acts as a mediator between the cable interior and the external connector environment.
Solution Approach 2:
The conductive sleeve is applied locally only in the termination region where the conductive foil was removed, rather than along the entire cable length. This localized application restores impedance control precisely where needed without affecting other regions of the cable.
2Ease of operation
If the conductive foil is removed for termination, then connector connection is enabled, but crosstalk increases due to loss of shielding
Solution Approach 1:
The conductive sleeve serves as a shielding intermediary in the termination region, replacing the protective function of the removed conductive foil. It maintains electromagnetic field confinement and prevents crosstalk between adjacent cable pairs while allowing connector access.
3Ease of operation
If the conductive foil is removed to expose conductors for connection, then connectorization is achieved, but the ground reference continuity is interrupted
Solution Approach 1:
The conductive sleeve restores the ground reference continuity by providing a conductive path in the termination region. It mediates between the cable's internal ground system and the external connector ground, ensuring uninterrupted reference potential despite the removal of the conductive foil.
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 effectively maintains impedance match and reduces crosstalk, enhancing signal transmission efficiency across a wider frequency range by confining the electromagnetic field and providing a stable ground reference.
Implementation Method 1
capacitive section that extends from a portion of the central portion at the rear of the central portion... adapted to be placed immediately adjacent to an insulator of the cable and another conductor of the cable to form substantially a capacitive shorting circuit
Data Source
AI summary
A conductive sleeve includes a central portion with a front, a rear, and sides; at least one flange mated with at the sides of the central portion; and capacitive section that extends from a portion of the central portion at the rear of the central portion. The central portion is adapted to be placed over an end of a cable and extend over at least one conductor of the cable. The at least one flange is adapted to connect with a mating conductor. The capacitive section has a width smaller than a width of the central portion and is adapted to be placed immediately adjacent to an insulator of the cable and another conductor of the cable to form substantially a capacitive shorting circuit.