RJ-45 Receptacle Contact Array Crosstalk Reduction
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Solution Overview
Problem
Electrical connectors, such as RJ-45 connectors, experience significant signal degradation due to crosstalk and impedance mismatch, leading to increased noise and return loss, especially at higher frequencies and wider bandwidths.
Innovation Solution
A receptacle assembly design featuring a contact array with specific bend patterns and spatial arrangements of array contacts and contact holes on a circuit board, which includes first and second tail sub-sections of array contacts extending in different directions and distances, and a wire termination contact pattern that isolates noisy pairs and optimizes signal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple differential pairs are positioned in close proximity to each other in the connector, then the connector can transmit more signals, but electromagnetic signal coupling or crosstalk increases which degrades signal quality
Solution Approach 1:
The patent applies dimensionality change by transitioning from a planar contact arrangement to a three-dimensional contact array with contacts positioned at different depths and angles. The contacts are arranged in a staggered configuration where some contacts extend further forward than others, creating spatial separation in multiple dimensions. This 3D arrangement reduces electromagnetic coupling between adjacent differential pairs while maintaining high signal transmission capacity.
Solution Approach 2:
The contact array is segmented into multiple groups corresponding to different differential pairs, with each group spatially separated from others. The contacts within each differential pair are positioned close together, while contacts from different pairs are separated by insulating material and spatial gaps. This segmentation approach allows multiple signals to be transmitted simultaneously while minimizing crosstalk between pairs.
2Speed
If the connector assembly is used to transmit data across higher frequencies and wider bandwidths, then the data transmission capability is improved, but signal degradation due to EM signal coupling, return loss and impedance mismatch increases
Solution Approach 1:
The patent applies local quality by providing different contact geometries and positions for different contacts within the array. Each contact is specifically designed with unique dimensions, bend radii, and positioning to optimize its local electromagnetic characteristics. The contact array includes contacts with varying lengths, thicknesses, and orientations tailored to their specific positions and signal requirements, enabling high-frequency transmission with minimized signal degradation.
Solution Approach 2:
The patent utilizes parameter changes by varying multiple geometric parameters of the contacts including length, thickness, bend radius, and angular orientation. The contact array features contacts with different effective lengths and impedance characteristics to match specific signal requirements. By adjusting these parameters, the design achieves impedance matching and minimizes return loss at higher frequencies while maintaining signal integrity.
3Ease of manufacture
If a conventional contact array design is used, then the manufacturing process is simple, but crosstalk and return loss are significant
Solution Approach 1:
The patent applies preliminary action by pre-forming the contacts with specific bend configurations and spatial orientations before final assembly. The contact array is manufactured with pre-established geometric features including bends, angles, and positions that are designed to optimize electromagnetic performance. This preliminary structuring allows the complex 3D contact arrangement to be achieved through standardized manufacturing processes while maintaining the sophisticated geometry needed to reduce return loss and crosstalk.
Data Source
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AI summary
A receptacle assembly comprises a housing (108) having front (102) and rear (104) ends. The front end receives a plug and the rear end accepts wire termination contacts (113) . A circuit board (148) has a plurality of contact holes (188, 190) and is held within the housing. A plurality of array contacts (124, 126, 128, 130, 132, 134, 136, 138) is arranged in a contact array (106) within the housing. Each of the plurality of array contacts comprises a main section (218) and a tail section (216) . The main section runs generally perpendicular to the circuit board. The tail section has a first bend forming a first tail sub-section (228) extending parallel to the circuit board and a second bend forming a second tail sub-section (222) extending perpendicular to the circuit board. The second tail sub-section of each of the plurality of array contacts is received by one of the plurality of contact holes in the circuit board.