Shield Connector Fitting Structure for High-Frequency Impedance Matching
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Solution Overview
Problem
In connectors for transmitting high frequency signals, a gap between the female and male derivatives can cause impedance mismatching due to changes in relative permittivity, leading to signal reflection and reduced transmission efficiency.
Innovation Solution
The connector design includes a female terminal module with an insulating derivative and a male terminal module with a fitting portion that recess-protrudes, ensuring the male connection portion is inserted into the female fitting portion, maintaining low impedance by minimizing relative permittivity changes through tapered surfaces that reduce the space around the connection, preventing direct contact and maintaining uniform impedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the female connector and male connector are coupled together with a gap between the derivatives, then the assembly is easier, but the impedance matching deteriorates due to relative permittivity changes in the gap
Solution Approach 1:
The patent introduces a derivative structure that acts as an intermediary between the male and female connectors. This derivative includes a fitting portion that protrudes from the male connector and fits into a corresponding recess in the female connector, mediating the connection to eliminate gaps while maintaining ease of coupling. The derivative serves as a bridge that ensures continuous impedance matching across the connector interface.
Solution Approach 2:
The patent modifies the geometric parameters of the connector components, specifically designing the derivative with optimized dimensions for the fitting portion and recess. By carefully controlling the size, shape, and positioning of these features, the design achieves both easy coupling (through tolerance accommodation) and maintained impedance (through gap elimination). The parameter optimization balances mechanical assembly requirements with electromagnetic performance.
2Reliability
If the male connection portion extends further than the fitting portion, then the impedance is maintained, but the manufacturing precision requirement increases
Solution Approach 1:
The patent incorporates the fitting portion and recess as preliminary structural features that guide the connection process. The recess in the female derivative is pre-formed to receive the protruding fitting portion, establishing the correct position before the actual electrical connection is made. This preliminary mechanical guidance ensures that the male connection portion automatically achieves the correct extended position, reducing the need for high-precision manufacturing while maintaining impedance consistency.
Solution Approach 2:
The design includes built-in tolerance compensation through the fitting portion and recess geometry. The recess is designed with dimensions that accommodate manufacturing variations, providing a 'cushion' that absorbs dimensional deviations. This beforehand cushioning ensures that even with normal manufacturing tolerances, the male connection portion will extend sufficiently to maintain impedance matching without requiring ultra-precise manufacturing.
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 suppresses impedance changes, reducing reflection loss of high frequency signals and maintaining transmission efficiency by ensuring the fitting portions are closely contacted, even if not completely, thereby minimizing local impedance variations.
Implementation Method 1
a gap may be created between the derivative of the female connector and the derivative of the male connector when the female connector and the male connector are coupled together. If so, no derivative is between the core wire terminal and the electrically grounding member in the gap between the derivatives, and the relative permittivity in the gap is changed and the impedance in the gap becomes high.
Data Source
AI summary
A connector includes a female terminal module and a male terminal module that is to be coupled to the female terminal module. The female terminal module includes a female-side inner conductor, a female-side derivative, and a female-side outer conductor. The female-side outer conductor receives therein the female-side inner conductor via the female-side derivative. The male terminal module includes a male-side inner conductor, a male-side derivative, and a male-side outer conductor. The male-side outer conductor receives therein the male-side inner conductor via the male-side derivative and is connected to the female-side outer conductor. The female-side fitting portion of the female-side derivative and the male-side fitting portion of the male-side derivative are fitted to each other with recess-protrusion fitting. The male-side inner conductor includes a male connection portion and the male connection portion is inserted in the female-side fitting portion and connected to the female-side inner conductor.