Twinax Connection Pad Positioning for Impedance Homogeneity
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Solution Overview
Problem
Existing connection methods for high-frequency data signals, such as twinax or shielded twisted pair cables, suffer from insufficient impedance homogeneity at the electrical transition, leading to suboptimal signal integrity as data rates increase.
Innovation Solution
The connection pad for the drain wire is positioned between the connection pads of the two cores, maintaining a virtually constant effective distance between the cores by ensuring the drain wire contacts the cylindrical insulations, thereby reducing impedance irregularities and enhancing coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional connection methods are used for high-frequency data signals, then the connection structure is simple, but impedance homogeneity deteriorates leading to poor signal integrity
Solution Approach 1:
The drain wire connection pad serves as an intermediary element positioned between the two core connection pads. This intermediary structure provides a reference potential that stabilizes the electrical transition region, enabling homogeneous impedance control without requiring complex external matching networks or additional shielding structures.
Solution Approach 2:
The connection device implements local quality optimization by creating a specific electrical configuration in the transition region where the drain wire connection pad is positioned between the two cores. This local arrangement establishes a reference potential that improves impedance homogeneity specifically at the critical connection interface, while the rest of the cable structure remains unchanged.
2Productivity
If data rates are increased to achieve higher transmission capacity, then productivity improves, but signal integrity deteriorates due to impedance irregularities
Solution Approach 1:
The drain wire connection pad acts as a mediator that stabilizes the electrical transition region, providing a reference potential that maintains impedance homogeneity even at high data rates. This intermediary structure prevents signal degradation that would otherwise occur when increasing transmission capacity.
3Manufacturing precision
If the connection pad for the drain wire is positioned between the two cores, then impedance homogeneity improves, but the connection device complexity increases
Solution Approach 1:
The drain wire connection pad performs multiple functions simultaneously: it provides a reference potential for impedance control, establishes a stable electrical transition region, and maintains mechanical alignment. This multi-functionality achieves impedance homogeneity without requiring additional separate components or complex structures.
Solution Approach 2:
The invention merges the drain wire connection function with the impedance control function by positioning the drain wire connection pad between the two cores. This combined arrangement achieves both proper drain wire grounding and homogeneous impedance control in a single structural configuration, rather than requiring separate mechanisms for each function.
Data Source
AI summary
In order to improve the signal integrity, for a connection device for twinax cables the connecting pad belonging to the respective drain wire is disposed directly between the two connecting pads of the two leads belonging to the same data line. Groups of connecting pads can be disposed so that they are offset with respect to one another in order to prevent crosstalk. To this end the data lines can be fastened to the connection device, which for example consists of a circuit board.