Shield Connector Back Wall Recesses Reduce Skin Effect Noise
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Solution Overview
Problem
Conventional shield connectors experience increased electromagnetic noise due to the skin effect, where return currents concentrate on the outer surface, leading to secondary radiation of noise, compromising their shielding effectiveness.
Innovation Solution
The shield connector features a shield shell with a cover having bottomed recesses or projections on its outer surface in the inter-terminal facing areas, which reduces current density and minimizes neighborhood noise by providing a larger surface area for current distribution and canceling out opposing current vectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the shield shell has a flat outer surface, then the structure is simple and easy to manufacture, but the current density on the outer surface increases due to the skin effect, causing increased electromagnetic noise radiation
Solution Approach 1:
The patent applies local quality by introducing recesses or projections at specific locations on the outer surface of the shield shell, particularly at the lower end edge of the back wall. This local structural modification changes the current distribution characteristics only where needed (at the edge where return currents concentrate), rather than changing the entire surface. The recesses/projections create localized current path extensions that reduce current density at critical noise-radiating areas while maintaining the overall simplicity of the shield shell structure.
Solution Approach 2:
The patent employs dimensionality change by transitioning from a flat two-dimensional surface to a three-dimensional surface with recesses or projections. This adds depth dimension to the outer surface structure, creating varying current path lengths and distributing return currents more evenly across the surface. The dimensional change allows the current to travel through recesses or around projections, effectively reducing current density at the edge areas without complicating the manufacturing process significantly.
2Object-generated harmful factors
If the outer surface area of the shield shell is increased to reduce current density, then the structure becomes more complex, but this increases manufacturing difficulty and cost
Solution Approach 1:
Instead of increasing the overall surface area of the entire shield shell, the patent applies local quality by adding recesses or projections only at specific critical areas (lower end edge of the back wall). This localized approach increases the effective current path area only where current density is highest, thereby reducing current density and electromagnetic noise without significantly increasing the overall structural complexity or manufacturing difficulty of the entire shield shell.
Solution Approach 2:
The patent applies partial action by implementing the surface modification (recesses or projections) only at the specific location where it is most needed - the lower end edge of the back wall where return currents concentrate and where the skin effect causes highest current density. This partial modification is sufficient to reduce electromagnetic noise without requiring complex modifications to the entire shield shell 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 configuration effectively reduces neighborhood noise by 2 to 15% compared to conventional designs, maintaining the original shielding mechanism by lowering current density on the outer surface of the shield shell.
Implementation Method 1
A phenomenon in which a current density increases on a surface of a conductor in this way is known as a skin effect. As a result of the skin effect, the current concentrated on the outer surface of the back wall may secondarily radiate electromagnetic noise
Implementation Method 2
the bottomed recess or projection is provided in the inter-terminal facing area of the outer surface of the cover. Thus, a density per unit area of the current flowing in the inter-terminal facing area (current density) can be lowered and neighborhood noise can be reduced
Data Source
AI summary
A shield connector (10) includes terminals (50) arranged side by side in a width direction. A shield shell (70) collectively surrounds the terminals (50) on an outer peripheral side, and a dielectric (40) interposed between the respective terminals (50) and the shield shell (70). The shield shell (70) includes a back wall (74) serving as a cover for covering an exposed surface of each terminal (50) from the dielectric (40). The back wall (74) includes bottomed recesses (88) at positions facing areas, across which the respective terminals (50) are adjacent in the width direction, on an outer surface (87) on a side opposite to an inner surface (86) facing the respective terminals (50).