Shield Connector Terminal Hole Structure for High-Frequency Impedance
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Solution Overview
Problem
Existing shield connectors for shielded differential cables experience reduced noise resistance and increased impedance when used in high frequency bands due to air layers between the insulation coating and the shell member.
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 reducing impedance and improving signal transmission in high frequency bands.
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 structure, but air layers are formed between the insulation coating and the shell member, increasing impedance and reducing noise resistance in high frequency bands
Solution Approach 1:
The terminal hole portion is segmented into a first terminal hole and a second terminal hole that are partially connected at the outer edge. This segmentation creates a more complex internal structure that eliminates air layers between the insulation coating and shell member, thereby reducing impedance and improving noise resistance in high frequency bands.
2Object-affected harmful factors
If the terminal hole portion is made thinner and partially connected at the outer edge, then impedance is reduced and signal transmission in high frequency bands is improved, but the manufacturing complexity increases
Solution Approach 1:
The terminal hole portion has different local qualities: the first and second terminal holes are thinner than the crimp portion and connecting portion, and they are partially connected at the outer edge. This local variation in thickness and connectivity creates the necessary structure to reduce air layers and impedance while maintaining ease of manufacture in other areas.
3Device complexity
If the inner housing has no wire separation structure, then the device complexity is reduced, but the electric wires cannot be separated at a predetermined pitch, affecting signal transmission quality
Solution Approach 1:
The inner housing includes a wedge piece that preliminarily separates the electric wires at a predetermined pitch before they enter the terminal holes. This preliminary separation action ensures proper wire positioning and maintains signal transmission quality in high frequency bands while keeping the overall structure relatively simple.
Data Source
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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.