Differential PCB Connector Traces for Impedance Matching
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Solution Overview
Problem
Existing electrical connectors for data and communication cables face challenges in achieving high return loss and low insertion loss, which are critical for maintaining signal quality and data rate, due to variations in impedance caused by geometric and material properties of the conductor tracks.
Innovation Solution
The electrical connector features a housing with a circuit board hosting first and second contact elements connected by conductor tracks with varying widths, where the conductor track width decreases gradually from the second contact element to the first, maintaining a constant distance between tracks, optimizing impedance and reducing degrees of freedom for impedance optimization, thereby ensuring high return loss and low insertion loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conductor track width is varied to optimize impedance, then return loss is improved, but the design complexity increases
Solution Approach 1:
The patent applies parameter changes by systematically varying the conductor track width across different sections to optimize impedance matching. The conductor track width is changed from 0.3mm in the first section to 0.15mm in the second section, and further to 0.075mm in the third section, which directly controls the impedance values (50Ω, 70.7Ω, 100Ω) to minimize signal reflections and maximize return loss.
Solution Approach 2:
The conductor track is divided into multiple sections with different widths, each section having a specific impedance value. This segmentation allows independent optimization of each section's impedance characteristics, enabling precise control over signal reflection at each interface while maintaining manageable design complexity through modular design.
2Reliability
If the conductor track width is decreased to increase impedance, then impedance matching is improved, but insertion loss increases
Solution Approach 1:
The patent uses parameter changes to optimize the balance between impedance matching and insertion loss by carefully selecting the conductor track widths and corresponding impedance values for each section, ensuring that impedance transitions are optimized while keeping the physical dimensions practical for manufacturing.
Solution Approach 2:
Different sections of the conductor track have different local properties (widths and impedances) optimized for their specific function. The first section has wider tracks for lower impedance, the second section has intermediate dimensions for impedance transformation, and the third section has narrower tracks for higher impedance, with each section's properties locally optimized for its role in the overall impedance matching network.
Data Source
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AI summary
Electrical connector (1) for a data or communication cable with the following features: - a housing (10), - a circuit board (20) at least partially arranged in the housing (10), - first contact elements (21) and second contact elements (22) arranged on the circuit board (20), wherein - each of the first contact elements (21) is electrically connected to a second contact element (22) by means of a conductor track (60), - at least one conductor track (60) which has at least three different conductor track widths (B1-B3) from the first contact element (21) to the second contact element (22), characterized by the further features: - the conductor track width (B1-B3) decreases continuously or stepwise from the second contact element (22) to the first contact element (21) for at least three successive conductor track widths (B1-B3),- the distance (63) between the two conductor tracks (60) of a differential line (62) is at least partially constant over each of the at least three successive conductor track widths (B1-B3).