Coaxial Connecting Device Ground Path Minimization
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Solution Overview
Problem
Conventional coaxial connecting devices experience unstable electric current and signal degradation due to direct contact with test objects, leading to interference and reduced reliability in signal transmission during repeated attachments and detachments.
Innovation Solution
A coaxial connecting device with a signal pin and ground connector that minimizes contact path through a cylindrical guide tube and dielectric member, maintaining a predetermined distance and ensuring electrical isolation, thereby reducing signal loss and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the interface element is fixed on the exterior barrel such that the ground sleeve slides along the interface element, then the device allows repeated attachment and detachment, but the contact assembly and ground plunger are likely to contact the conductors of the test object before fixing the exterior barrel in place, causing unstable electric current
Solution Approach 1:
The device is divided into separate functional modules: the coaxial cable assembly with inner conductor and outer shield, the test object interface with signal pad and ground pad, and the connecting structure with isolator. This segmentation allows the signal path and ground path to be independently controlled, enabling repeated connections while maintaining current stability through proper sequencing of contact-making.
Solution Approach 2:
The isolator is pre-positioned between the inner conductive contact assembly and the conductive ground plunger. This preliminary placement of the isolator ensures that when the exterior barrel is approached, the ground connection is established first through the ground sleeve sliding along the interface element, preventing unstable current before the signal contact is made.
2Ease of operation
If the contact assembly and ground plunger contact the conductors of the test object before fixing the exterior barrel in place, then the device allows easy connection, but it causes unstable electric current requiring laborious switching on and off
Solution Approach 1:
The ground sleeve and ground connector are designed to establish an equipotential ground connection first through the sliding action along the interface element. This ensures that both the test object and the connecting device are at the same ground potential before signal contact is made, eliminating ground loops and unstable current while maintaining ease of operation.
Solution Approach 2:
The ground sleeve acts as an intermediary element that mediates the connection sequence. As it slides along the interface element, it establishes the ground path before the signal path, serving as a mechanical mediator that enforces proper connection sequencing without requiring manual intervention or switching operations.
3Device complexity
If a conventional coaxial connecting device is used, then the device structure is simple, but the contact path between coaxial cable and external pad is long, causing signal loss and interference
Solution Approach 1:
The inner conductive contact assembly is nested within the conductive ground plunger, which is in turn surrounded by the isolator and exterior barrel. This nested configuration minimizes the contact path length by bringing the signal contact and ground contact into close proximity while maintaining electrical isolation, thereby reducing signal loss and interference without significantly increasing device complexity.
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 solution effectively minimizes the contact path between the coaxial cable and the ground pad, improving impedance match and frequency characteristics, enhancing signal transmission reliability and stability.
Implementation Method 1
a dielectric member surrounding a part of the signal pin for electrically isolating the cylindrical guide tube and the signal pin from each other
Implementation Method 2
an elastic member arranged between the main body and the ground contact part, the elastic member surrounding the bridge part
Data Source
AI summary
A coaxial connecting device is provided for making an electrical connection between a coaxial cable and a device under test. A coaxial connecting device electrically connects a coaxial cable to a signal pad and a ground pad. The coaxial contractor of the present invention includes a signal pin for electrically connecting a signal conductor of the coaxial cable to the signal pad; a ground connector for electrically connecting a ground conductor of the coaxial cable to the ground pad; a cylindrical guide tube surrounding the ground conductor for elastically contacting the ground connector while maintaining a predetermined distance with the signal pin; and a dielectric member surrounding a part of the signal pin for electrically isolating the cylindrical guide tube and the signal pin from each other and coaxially maintaining the guide tube and the signal pin. The coaxial connecting device of the present invention minimizes a contact path between the ground conductor of a coaxial cable and a ground pad and provides impedance matched coaxial signal transmission link, resulting in improvement of frequency characteristics.