Communications Connector Impedance Mismatches for Return Loss
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Solution Overview
Problem
Communications connectors, particularly those in high-frequency applications, face challenges in maintaining acceptable return loss and insertion loss performance due to inductive and capacitive couplings, which degrade signal quality and are exacerbated by the need for backwards compatibility with lower frequency standards.
Innovation Solution
The implementation of communications connectors with strategically designed impedance mismatches and discrete reactive elements, such as capacitors and inductors, to create resonances that enhance return loss and insertion loss performance over specific frequency ranges, while ensuring compatibility with existing standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If communications connectors are designed for high-frequency applications, then signal transmission speed increases, but return loss and insertion loss performance deteriorates due to inductive and capacitive couplings
Solution Approach 1:
The patent applies preliminary anti-action by intentionally introducing impedance mismatches and discrete reactive elements (capacitors and inductors) into the transmission line before the harmful inductive and capacitive couplings can degrade the signal. These elements create resonances that counteract the harmful couplings, generating compensating signals that cancel out the degradation effects and improve return loss and insertion loss performance at high frequencies
Solution Approach 2:
The patent converts the harmful inductive and capacitive couplings into beneficial effects by designing impedance mismatches and reactive elements that generate resonances at specific frequencies. These resonances create compensating signals that transform the harmful couplings into useful signal reinforcement, improving return loss and insertion loss performance while maintaining high-frequency signal transmission
2Reliability
If impedance mismatches and discrete reactive elements are added to improve return loss performance, then signal integrity improves, but device complexity increases
Solution Approach 1:
The patent applies local quality by strategically placing impedance mismatches and discrete reactive elements (capacitors and inductors) at specific locations within the connector where they are most effective. Rather than uniformly modifying the entire transmission line, the reactive elements are positioned at critical points to create resonances that target specific frequency ranges, thereby improving signal integrity with minimal additional complexity
Solution Approach 2:
The patent employs parameter changes by carefully selecting the impedance values of the mismatches and the capacitance/inductance values of the reactive elements to achieve desired resonance frequencies. By adjusting these parameters, the connector can be tuned to improve return loss and insertion loss performance at specific frequency ranges without requiring a complete redesign of the entire connector structure
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 significantly improves return loss and insertion loss performance across a wide frequency range, including frequencies above 1 GHz, by tuning resonances to occur outside the operational range, thus maintaining signal integrity and compatibility with Category 6 and 6a standards.
Implementation Method 1
a first transmission line segment having a first impedance that is different from a second impedance of a second transmission line segment
Implementation Method 2
tuning resonances to occur outside the operational range, thus maintaining signal integrity
Data Source
Figure 1~2
Figure 3~4A
Figure 4B~5
AI summary
Communications plugs are provided that include a housing that receives the conductors of the communication cable. A printed circuit board is mounted at least partially within the housing. A plurality of plug contacts are on the printed circuit board, and the printed circuit board includes a plurality of conductive paths that electrically connect respective ones of the conductors to respective ones of the plug contacts. First and second of the conductive paths are arranged as a first differential pair of conductive paths that comprise a portion of a first differential transmission line through the communications plug, where the first differential transmission line includes a first transition region where the impedance of the first differential transmission line changes by at least 20% and a second transition region impedance of the first differential transmission line changes by at least 20%.