Connector Ground Shields with Lossy Coating for Resonance Mitigation
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Solution Overview
Problem
Electrical connectors experience signal degradation due to resonance spikes at high frequencies, despite the presence of ground conductors, which inhibit signal integrity during high-speed data transmission.
Innovation Solution
The electrical connector incorporates ground shields with a lossy coating on the outer sides to absorb and dissipate electrical resonances, while the inner sides remain uncoated to maintain low resistance connections and signal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ground conductors are added to improve signal integrity, then electrical shielding is enhanced, but electrical resonances propagate along the ground conductors causing signal degradation
Solution Approach 1:
The patent applies a lossy coating to the ground shields that converts harmful electrical resonance energy into heat through resistive dissipation. The lossy material absorbs the resonant energy that would otherwise propagate along the ground conductors, transforming the harmful electromagnetic energy into thermal energy that is dissipated, thereby eliminating the resonance problem while maintaining the grounding function.
Solution Approach 2:
The lossy coating is selectively applied only to specific portions of the ground shields, particularly at locations where resonances are most likely to occur or have the greatest impact. This localized treatment allows the ground shield to maintain its electrical shielding function in uncoated areas while providing resonance absorption in coated areas, optimizing both signal integrity and resonance mitigation.
2Speed
If high speed electrical signals are transmitted, then data transfer rate is increased, but resonance spikes occur at certain frequencies degrading transmission performance
Solution Approach 1:
The lossy coating on the ground shields converts harmful resonance energy into heat, allowing high-speed signal transmission without the detrimental effects of resonance spikes. By dissipating the resonant energy that occurs at certain frequencies during high-speed transmission, the coating enables maintained signal quality even at elevated data transfer rates.
3Reliability
If ground shields surround signal contacts, then electrical shielding is improved, but electrical resonances reflect back and forth along the conductors creating standing waves
Solution Approach 1:
The lossy coating converts the resonance energy that reflects back and forth along the ground shields into heat through resistive dissipation. This prevents the formation of standing waves by continuously absorbing the reflected energy, transforming the harmful oscillating electromagnetic fields into thermal energy that is dissipated, thereby eliminating standing wave formation while maintaining shielding effectiveness.
Solution Approach 2:
The lossy coating is strategically positioned on the ground shields at locations where resonance reflection and standing wave formation are most problematic. This localized application provides targeted damping of reflected waves without compromising the overall shielding structure, allowing the ground shields to maintain their electrical shielding function while preventing standing wave formation in critical areas.
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 design effectively mitigates electrical resonances, enhancing signal integrity and reducing interference at high frequencies, thereby improving the overall performance of high-speed connectors.
Implementation Method 1
The outer sides of the ground shields have a lossy coating to absorb electrical resonances
Implementation Method 2
a lossy coating on the metal body along at least a majority of the surface area of the outer side to absorb electrical resonances
Data Source
AI summary
An electrical connector includes a housing, signal contacts, and ground shields. The housing has a base wall that defines openings therethrough. The signal contacts are arranged in pairs and project through at least some of the openings beyond a top side of the base wall. The ground shields project through at least some of the openings beyond the top side of the base wall. Each ground shield has at least two walls and at least partially surrounds a corresponding pair of the signal contacts. Each ground shield has an inner side that faces the corresponding pair of signal contacts and an outer side that is opposite the inner side. The outer sides of the ground shields have a lossy coating to absorb electrical resonances, and the inner sides of the ground shields lack the lossy coating.