Electrical Connector Electrostatic Shielding Crosstalk Reduction
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Solution Overview
Problem
High-speed signals experience significant crosstalk and loss of signal integrity when passing through connectors due to close proximity of contacts, which is exacerbated by the disturbance of transmission lines as they move through the connector.
Innovation Solution
The connector employs a design with a carrier holding contacts that include a first conductive element for signal transmission and a second conductive element acting as an electrostatic shield, along with polymer columns and flexible insulative layers to reduce crosstalk by electromagnetically coupling signals and grounding them tightly, thereby minimizing electromagnetic coupling between neighboring contacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If contacts are placed in close proximity to increase component density, then space on the circuit board is saved, but crosstalk and loss of signal integrity increase
Solution Approach 1:
A ground contact is introduced as an intermediary element positioned between signal-bearing contacts. This ground contact acts as a mediator that absorbs or redirects electromagnetic interference, preventing crosstalk between adjacent signal contacts while allowing the contacts to remain in close proximity for high density.
Solution Approach 2:
The connector contacts are segmented into different functional types: signal-bearing contacts and ground contacts. This segmentation allows the design to differentiate between contacts that carry signals and those that provide electromagnetic shielding, enabling close spacing of signal contacts while inserting ground contacts periodically to reduce crosstalk.
2Object-affected harmful factors
If transmission line benefits are used to reduce crosstalk, then signal integrity is improved, but the benefits are lost when the signal encounters a connector
Solution Approach 1:
Ground contacts are positioned upstream and downstream of signal-bearing contacts within the connector, creating a preliminary electromagnetic shield before the signal enters the connector and maintaining shielding as the signal exits. This preliminary action ensures that the transmission line benefits are preserved through the connector transition.
Solution Approach 2:
The electromagnetic shielding property is applied locally at specific positions within the connector rather than uniformly throughout. Ground contacts are strategically positioned at intervals between signal contacts, providing localized shielding where crosstalk is most problematic while maintaining signal integrity through the connector.
3Reliability
If more ground contacts are added to reduce crosstalk, then signal integrity is improved, but device complexity increases
Solution Approach 1:
Rather than providing continuous ground shielding throughout the entire connector, the design uses partial action by placing ground contacts only at critical intervals between signal contacts. This provides sufficient electromagnetic shielding to reduce crosstalk while avoiding the excessive complexity of a fully continuous ground 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 design effectively reduces crosstalk and preserves signal integrity even at high contact densities, maintaining the benefits of transmission lines through the connector by tightly coupling signals and grounds, minimizing signal degradation.
Implementation Method 1
The second conductive element provides an electrostatic shield for the first conductive element
Implementation Method 2
reduce crosstalk by electromagnetically coupling signals and grounding them tightly
Data Source
AI summary
An electrical connector includes a carrier having opposite first and second sides. A plurality of contacts are held in the carrier. Each contact includes a first conductive element and a second conductive element. The first conductive element defines a conductive path configured to electrically connect an electrical component on the first side of the carrier to an electrical component on the second side of the carrier. The second conductive element provides an electrostatic shield for the first conductive element.