CATV Port Terminator with Deformable Ground Insert for RF Sealing
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Solution Overview
Problem
Loose connections in CATV systems lead to poor signal quality due to improper installation and vibrations, resulting in gaps that cause RF signal leakage, especially in high-density urban areas with unused ports.
Innovation Solution
A port terminator with an electrically conductive ground insert and deformable petals that ensure a uniform RF seal across a range of tightening torques, providing a secure mechanical and electrical connection between the coaxial cable connector and port.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional coaxial cable connector is used without additional components, then the device complexity is low, but the connection reliability deteriorates due to loose connections and gaps causing RF signal leakage
Solution Approach 1:
The ground insert is nested inside the connector housing, with the deformable portion positioned within the internal structure. The capture portion holds the termination resistor ground lead inside the connector, creating a compact nested arrangement that improves reliability without significantly increasing external dimensions or complexity
Solution Approach 2:
The ground insert acts as an intermediary component between the termination resistor and the connector housing. It provides a dedicated mechanical and electrical connection path, mediating the connection between the resistor's ground lead and the connector's ground structure, thereby improving connection reliability
2Reliability
If a spring element is added to bias the connector face towards the port, then the connection reliability improves, but the manufacturing time and cost increase
Solution Approach 1:
The spring element is extracted from the connector assembly and replaced with a deformable portion of the ground insert that provides biasing force through its own elastic deformation. This removes the separate spring component and simplifies the manufacturing process while maintaining the reliability benefit of biased contact
Solution Approach 2:
The spring biasing function is merged with the ground insert structure. The deformable portion of the ground insert combines the ground connection function with the spring biasing function in a single integrated component, eliminating the need for separate spring elements and reducing manufacturing complexity
3Reliability
If unused ports are left unterminated or with loose connectors, then the device complexity remains low, but significant degradation to CATV service occurs due to RF signal leakage
Solution Approach 1:
The ground insert's deformable portion automatically makes contact with the connector housing when the connector is assembled, creating a self-sealing effect. The elastic deformation provides continuous contact pressure that maintains RF sealing without requiring additional active components or complex termination mechanisms
Solution Approach 2:
The ground insert changes its physical state from a relaxed configuration to a deformed configuration during assembly. This parameter change in shape and position enables the deformable portion to make firm contact with the connector housing, ensuring reliable RF sealing and service quality
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 maintains signal quality by ensuring a tight connection regardless of installation torque, reducing signal degradation and enhancing RF shielding, even in environments prone to vibrations.
Implementation Method 1
a deformable portion of the ground insert makes electrical contact with a connection end of an equipment port when the port terminator is screwed onto the equipment port. The deformable portion can take the form of a flexible brim or a plurality of petals.
Data Source
AI summary
A port terminator includes an outer nut, which may be either electrically conductive or non-electrically conductive, and an electrically conductive ground insert. A portion of the ground insert captures a ground portion of a termination resistor, while a deformable portion of the ground insert makes electrical contact with a connection end of an equipment port when the port terminator is screwed onto the equipment port. The deformable portion can take the form of a flexible brim or a plurality of petals. The petals preferably alternate between flat petals and biased petals. The ground insert permits the port terminator to make a uniform RF seal on an equipment port even with a range of tightening torques.