Shield Cable Terminal Structure With Axial Impedance Adjustment
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Solution Overview
Problem
In terminal units for shield cables, a significant portion of the inner conductor is exposed beyond the press-fit position, leading to excessive impedance rise, which affects impedance matching.
Innovation Solution
The terminal unit incorporates an impedance adjustment section connected to the press-fit portion, projecting outward to the axial direction other side, which increases capacitance and lowers impedance, and can be formed as a single body with the press-fit portion or separately, with radial and axial extensions to enhance impedance matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the inner conductor is allowed to extend beyond the press-fit position for ease of assembly, then the assembly process is simplified, but the impedance rises excessively at the exposed portion
Solution Approach 1:
The patent changes the physical parameters of the inner conductor by adding an impedance adjustment section with specific dimensional characteristics (length, diameter) that differ from the main body. This section is designed with optimized dimensions to control the electrical characteristics and reduce impedance at the exposed portion, thereby resolving the impedance matching issue while maintaining assembly ease
Solution Approach 2:
The patent addresses the impedance issue by extending the solution into the axial dimension, adding a specific section along the length of the inner conductor rather than modifying the radial structure. This axial extension allows for impedance control without interfering with the press-fit assembly process
2Manufacturing precision
If the impedance adjustment section is added to control impedance, then impedance matching is improved, but the device complexity increases
Solution Approach 1:
The patent merges the impedance adjustment section with the inner conductor to form an integrated structure. The impedance adjustment section is not a separate component but is combined with the inner conductor itself, reducing the number of parts and simplifying the overall device structure while still achieving impedance control
Solution Approach 2:
The patent applies local quality by creating a specific section of the inner conductor with different properties from the rest of the conductor. The impedance adjustment section has modified dimensional characteristics only in the specific region where impedance control is needed, while the rest of the inner conductor maintains its original design for connectivity and assembly
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 prevents excessive impedance rise at exposed portions of the inner conductor, achieving enhanced impedance matching and facilitating manufacturing by allowing easier integration with the dielectric member and connector design.
Implementation Method 1
This accordingly enables the capacitance of the press-fit portion to be increased, and the impedance of the press-fit portion to be lowered
Data Source
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AI summary
A terminal unit 14 includes one or more internal terminal 20, a dielectric member 30, and an external terminal 40. The internal terminal 20 includes a contact portion 21 for contacting a connection target (counterpart side connector), and a press-fit portion 24 for press-fitting together with an inner conductor 91. The contact portion 21 is provided at an axial direction one side, and the press-fit portion 24 is provided at an axial direction other side. The internal terminal 20 further includes an impedance adjustment section 25 connected to a press-fit portion 24. The impedance adjustment section 25 projects out to the axial direction other side with respect to the press-fit portion 24.