Shield Connector Shell Geometry for High-Frequency Noise Resistance
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Solution Overview
Problem
Existing shield connectors for high-frequency applications suffer from reduced noise resistance due to air layers between the insulation coating and the shell, leading to increased impedance.
Innovation Solution
A shield connector design with a metal shell featuring terminal holes partially connected at the outer edge and an inner housing with a wedge piece to separate electric wires at a predetermined pitch, reducing the air layer and enhancing contact with the metal shell, thereby minimizing impedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional shield connector with a quadrangular prism-shaped shell member is used, then the connector can be manufactured with simple geometry, but air layers form between the insulation coating and the shell member, reducing noise resistance and increasing impedance in high frequency bands
Solution Approach 1:
The patent applies curvature by changing the shell member shape from a quadrangular prism to an elliptical tube shape. This curved geometry allows the shell member to closely follow the contour of the insulated wire, eliminating air layers and improving electromagnetic shielding effectiveness in high frequency bands while maintaining manufacturing feasibility through standard drawing processes
2Device complexity
If a quadrangular prism-shaped shell member is used, then the structure is simple, but space (air layer) is left between the insulation coating and the shell member, increasing impedance
Solution Approach 1:
The elliptical tube shape of the shell member provides a curved surface that naturally conforms to the cylindrical insulated wire, ensuring close contact without requiring complex positioning features. This geometric adaptation simultaneously simplifies the overall structure while achieving precise contact and minimizing air gaps
3Ease of operation
If the shell member covers the exposed electric wire part with space left between, then the wire can be easily inserted, but the shielding effect is reduced in high frequency bands
Solution Approach 1:
The elliptical cross-section of the shell member creates a snug fit around the insulated wire through its curved geometry. This shape maintains ease of insertion while eliminating air layers that would compromise shielding, thereby improving electromagnetic compatibility in high frequency applications
Data Source
AI summary
The present invention provides a shield connector usable in a high frequency band. A connector 10 includes a pair of terminals 1, 1 each connected to a corresponding core Wc, an inner housing 2 holding the pair of terminals 1, 1 therein, a metal shell 3 that covers an exposed part of a pair of electric wires W, W to be in close contact with the exposed part, and a cover shell 4 connected to the metal shell 3 in series. An inner cavity of a terminal hole portion 32 into which part of the electric wires W, W exposed by an insulation coating enters is divided to form terminal holes 32h, 32h that are thinner than a crimp portion 31 and partially connected to each other at an outer edge to be shaped like an “infinity symbol”, allowing an insulation coating Wi on the electric wires W to be in close contact with the inner wall of the terminal holes 32h. This achieves excellent signal transmission in a high frequency band.