Connector Shell Leg Layout for Stronger Grounding and EMI Control
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Solution Overview
Problem
Conventional coaxial connectors experience poor electromagnetic interference (EMI) characteristics during high-speed signal transmission due to the reflection of signals, which leads to noise radiation from the terminal to the shell, as the front and rear legs are obliquely positioned and have a small cross-sectional area, resulting in weak grounding and re-radiation of noise.
Innovation Solution
The connector design includes a shell with elongated first and second legs that are positioned closer to the terminal, providing a larger cross-sectional area and improved grounding, reducing noise re-radiation by facilitating direct flow of noise to the ground layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the front and rear legs are positioned obliquely rearward relative to the terminal, then the terminal structure is simplified, but the grounding strength decreases and EMI characteristics worsen
Solution Approach 1:
The patent applies asymmetry by positioning the front leg and rear leg at different locations relative to the terminal. The front leg is positioned at a first location while the rear leg is positioned at a second location that is rearward of the first location, creating an asymmetric grounding structure that improves noise drainage while maintaining structural simplicity.
Solution Approach 2:
The patent extends the grounding structure in the front-rear dimension by positioning the rear leg rearward of the front leg. This dimensional extension allows the grounding path to extend further from the terminal, improving the ability to drain noise to ground without increasing overall device complexity.
2Device complexity
If the legs are positioned at a distance from the terminal, then the terminal design is simplified, but noise drainage capability decreases and re-radiation increases
Solution Approach 1:
The asymmetric positioning of legs at different front-rear locations creates multiple drainage paths at varying distances from the terminal, optimizing noise drainage capability while preventing re-radiation.
Solution Approach 2:
The grounding function is segmented into multiple legs positioned at different locations. The front leg provides primary grounding while the rear leg provides secondary grounding and noise drainage, dividing the grounding function to improve overall EMI performance.
3Volume of moving object
If the legs have a small cross-sectional area, then the connector size is reduced, but the grounding strength and noise drainage capability decrease
Solution Approach 1:
The patent optimizes leg dimensions in multiple directions, with each leg having a length in the up-down direction, a width in the right-left direction, and a thickness in the front-rear direction. This multi-dimensional optimization allows adequate grounding strength while maintaining compact overall size.
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
The improved connector design effectively suppresses noise re-radiation from the shell, enhancing EMI characteristics by ensuring noise is efficiently directed to the ground layer, thus reducing electromagnetic interference.
Implementation Method 1
the noise will easily flow to the ground via the first and/or second leg of the shell
Data Source
AI summary
A connector including an insulating body, at least one terminal, and a shell. Each terminal of the at least one terminal includes a main body partly held at least by the body, a distal portion, and a mounting portion. The distal portion extends from the main body to the one side in the first direction. The mounting portion extends from the main body to the other side in the first direction or to the one side in the second direction, and is located outside the body. The shell includes a generally tubular shell body securely accommodating the body and accommodating the main body(s) and the distal portion(s) of the at least one terminal. The shell includes two legs, which are ridges elongated in the first direction, extend from the shell body to the one side in the second direction, and are disposed on one and the sides, respectively, in a third direction relative to the at least one terminal.