Polymeric Isolator for Cable Hangers in RF Environments
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Solution Overview
Problem
In high radio frequency (RF) environments near cellular antennas, conductive cable hangers can generate undesirable passive intermodulation (PIM) due to steel-on-steel contact and low contact pressure, especially when multiple stacks of cable hangers are mounted in close proximity.
Innovation Solution
The use of a polymeric material isolator with a platform, extenders, and locking clips to mount cable hangers, which reduces the likelihood of PIM by providing a non-conductive interface and stable mounting solution, and an adapter with a trapezoidal profile and hose clamps for versatile mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple stacks of cable hangers are mounted in close proximity to increase cable capacity, then cable management efficiency is improved, but passive intermodulation (PIM) generation increases due to steel-on-steel contact
Solution Approach 1:
The patent introduces an isolator as an intermediary component between cable hangers and mounting structures. This isolator prevents direct steel-on-steel contact that causes PIM, while still enabling multiple cable hangers to be mounted in close proximity. The isolator acts as a mediator that maintains the beneficial close-proximity mounting arrangement while eliminating the harmful electromagnetic interaction.
2Reliability
If cable hangers are mounted with high contact pressure to improve structural stability, then mounting reliability is improved, but PIM generation increases due to conductive contact
Solution Approach 1:
The patent changes the material parameter of the isolator to have low electrical conductivity (high resistivity) while maintaining mechanical strength. This parameter change allows the isolator to provide sufficient mechanical support and contact pressure for reliable mounting while simultaneously preventing electrical conduction that would cause PIM. The isolator's material properties are specifically selected to decouple mechanical load-bearing from electrical conduction.
Data Source
AI summary
An isolator for mounting cable hangers, comprising: a platform having a hole; two extenders extending away from the bottom surface of the platform; and two locking clips, wherein each locking clip extends from an extender in a direction that is away from the bottom surface of the platform.