Shielded PCB Connector Layout to Prevent Electromagnetic Coupling
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Solution Overview
Problem
Existing shield connectors experience electromagnetic field coupling with surface layer wiring on circuit boards, which impairs high-frequency performance.
Innovation Solution
The shield connector design includes an outer conductor with a retraction recessed portion and an inner conductor extension to prevent electromagnetic coupling by separating the outer conductor from the surface layer wiring, featuring a retraction recessed portion in the outer conductor's bottom surface and a board connection portion for the inner conductor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the outer conductor is extended to surround the inner conductor up to the vicinity of the circuit board connection, then shielding performance is improved, but electromagnetic field coupling with surface layer wiring occurs which impairs high-frequency performance
Solution Approach 1:
The outer conductor is divided into two distinct portions: a first outer conductor that surrounds the inner conductor for shielding, and a second outer conductor that is retracted to avoid coupling with surface layer wiring. This segmentation allows each portion to perform its specific function independently, resolving the contradiction between shielding performance and high-frequency performance.
Solution Approach 2:
Different portions of the outer conductor are given different spatial configurations: the first outer conductor extends forward to provide shielding near the connection point, while the second outer conductor is retracted backward to avoid interference with surface layer wiring. This local differentiation of structure allows simultaneous achievement of shielding and high-frequency performance.
2Reliability
If the outer conductor is retracted to avoid electromagnetic coupling with surface layer wiring, then high-frequency performance is improved, but shielding effectiveness may be reduced
Solution Approach 1:
The shielding function is segmented between two portions: the first outer conductor provides shielding where it is needed (near the connection), while the second outer conductor is retracted to prevent harmful coupling. This segmentation ensures shielding effectiveness is maintained where critical while avoiding high-frequency interference elsewhere.
Solution Approach 2:
The solution addresses the shielding problem not by uniformly extending or retracting the outer conductor, but by creating a stepped configuration in the longitudinal dimension. This dimensional variation allows the outer conductor to provide shielding in some regions while being retracted in others, simultaneously achieving both shielding effectiveness and high-frequency performance.
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 configuration enhances high-frequency performance by preventing electromagnetic field coupling and crosstalk between adjacent inner conductors, thereby improving communication performance.
Implementation Method 1
The outer conductor prevents leakage of electromagnetic noise from the inner conductor and entrance of electromagnetic noise into the inner conductor
Implementation Method 2
The dielectric is made of synthetic resin, and maintains an insulated state between the inner conductor and the outer conductor
Implementation Method 3
the outer conductor may be electromagnetically coupled to the surface layer wiring (electromagnetic field coupling), which may impair high frequency performance
Data Source
AI summary
A shielded electrical connector includes an inner conductor and an outer conductor. The inner conductor includes an extension portion extending from a dielectric toward a circuit board. The outer conductor includes a bottom surface where an opening portion is open, and a back surface facing backward. The extension portion includes a board connection portion protruding from the opening portion to be connected to a conductive portion of the circuit board. A retraction recessed portion is formed in the bottom surface of the outer conductor. The retraction recessed portion extends backward from back edge portion of the opening portion in the bottom surface of the outer conductor and is open in the back surface.