High-Frequency Connector Contact Structure for Low Crosstalk
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Solution Overview
Problem
High-speed electrical connectors face challenges in maintaining signal integrity due to electrical interference and mechanical requirements that often preclude the use of shielding, leading to noisy impedance changes at the mating interface.
Innovation Solution
The design incorporates multiple points of contact along the elongated dimension of conductive elements with varying beam lengths and configurations, including dual and triple beam structures, to ensure reliable electrical connections while minimizing interference, and uses conductive inserts and stiffeners to manage electromagnetic energy and ground conductors effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If shield members are placed between or around adjacent signal conductors to reduce interference, then crosstalk is reduced and electrical properties are improved, but the connector complexity and manufacturing difficulty increase
Solution Approach 1:
The connector is divided into multiple wafers, each containing a subset of conductive elements. This segmentation allows shields to be implemented in a modular fashion across wafer boundaries, reducing crosstalk between adjacent signal conductors while managing complexity through standardized wafer designs that can be manufactured separately and assembled systematically.
Solution Approach 2:
Ground conductors are introduced as intermediary elements positioned between adjacent signal conductors. These ground conductors act as shields that reduce crosstalk by providing a reference potential that blocks electromagnetic coupling between neighboring signal paths, thereby improving electrical properties without requiring complex active shielding mechanisms.
2Quantity of substance
If conductive elements are placed close together to achieve high density, then the number of circuits per area increases, but electrical interference between adjacent conductors increases
Solution Approach 1:
The connector utilizes a three-dimensional stacked architecture with multiple wafers positioned at different vertical levels. Conductive elements are arranged in columns that extend through multiple wafers, allowing high circuit density to be achieved by exploiting the vertical dimension rather than simply packing more conductors in a single plane. This dimensional approach reduces lateral interference while maintaining high connectivity.
Solution Approach 2:
Ground conductors are strategically positioned between adjacent signal conductors within the same wafer and across wafer interfaces. These ground conductors serve as electromagnetic shields that reduce crosstalk and interference, enabling higher circuit density by allowing conductors to be placed closer together without suffering from excessive electrical interference.
3Reliability
If force is generated by spring characteristics of mating contact portions to press conductive elements together, then reliable electrical connection is achieved, but the mating interface becomes noisy with impedance changes
Solution Approach 1:
The mating contact portions incorporate spring characteristics that provide dynamic compliance during the mating process. This dynamic behavior allows the contacts to self-adjust and maintain optimal electrical connection under varying mechanical conditions, ensuring reliable connectivity while the controlled spring force minimizes abrupt impedance changes at the mating interface.
Solution Approach 2:
Ground conductors are positioned to extend through the mating interface and provide a continuous reference potential across the connection boundary. This intermediary ground structure stabilizes the electrical environment at the mating interface, reducing noise and impedance variations that would otherwise occur during the mechanical mating process.
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 enhances signal integrity by reducing unwanted resonances and crosstalk, improving mechanical reliability, and maintaining uniform contact resistance across the mating interface, thereby supporting high-speed data transmission.
Implementation Method 1
Frequently, this force is generated by spring characteristics of the mating contact portions in one of the connectors. For example, the mating contact portions of one connector may contain one or more members shaped as beams. As the connectors are pressed together, each beam is deflected by a mating contact, shaped as a post or pin, in the other connector. The spring force generated by the beam as it is deflected provides a contact force.
Data Source
AI summary
An electrical connector with improved high frequency performance. The connector has conductive elements, forming both signal and ground conductors, that have multiple points of contact distributed along an elongated dimension. The ground conductors may be formed with multiple beams of different length. The signal conductors may be formed with multiple contact regions on a single beam, with different characteristics. Signal conductors may have beams that are jogged to provide both a desired impedance and mating contact pitch. Additionally, electromagnetic radiation, inside and/or outside the connector, may be shaped with an insert electrically connecting multiple ground structures and/or a contact feature coupling ground conductors to a stiffener. The conductive elements in different columns may be shaped differently to reduce crosstalk.