Polymeric Cable Hanger Adapter Reducing PIM in RF Environments
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Solution Overview
Problem
In high radio frequency (RF) environments near cellular antennas, conventional cable hangers can generate undesirable passive intermodulation (PIM) due to conductive materials and contact issues, and existing solutions do not effectively manage multiple cable hanger installations in close proximity without increasing PIM risks.
Innovation Solution
A trapezoidal-profile adapter with a floor, ceiling, and side walls, featuring a mounting hole and windows for hose clamps, which allows for secure mounting of cable hangers without direct steel-on-steel contact, reducing PIM generation and enabling efficient stacking and multiple installations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional cable hangers with steel components are used in high RF environments, then structural strength and cable securing capability are improved, but passive intermodulation (PIM) generation increases due to conductive material contact
Solution Approach 1:
The patent introduces a polymeric adapter as an intermediary component between the mounting structure and cable hangers. This adapter body (100) made of polymeric material replaces direct steel-on-steel contact, thereby eliminating PIM generation while maintaining structural strength through the adapter's load-bearing design and attachment mechanisms.
Solution Approach 2:
The patent employs composite material construction by combining polymeric material for the adapter body with metallic components (feet, mounting hardware) strategically positioned for structural support and attachment functions. This composite approach maintains strength where needed while isolating conductive materials to prevent PIM.
2Quantity of substance
If multiple cable hangers are mounted in close proximity to increase cable capacity, then cable securing capability is improved, but the risk of PIM generation increases due to multiple conductive contact points
Solution Approach 1:
The polymeric adapter body serves as a mediator that allows multiple cable hangers to be mounted in close proximity without creating multiple steel-on-steel contact points. The adapter's structure provides isolated mounting locations for multiple hangers while maintaining electrical isolation through its polymeric construction.
3Ease of manufacture
If steel-on-steel contact is used for mounting cable hangers, then ease of manufacture and structural stability are improved, but PIM generation occurs due to conductive contact and relative movement
Solution Approach 1:
The adapter introduces a polymeric intermediary that eliminates direct metal-to-metal contact while maintaining simple mounting procedures. The adapter includes pre-formed attachment mechanisms (feet, mounting holes, slots) that simplify installation while the polymeric body prevents PIM generation.
4Adaptability or versatility
If hose clamps are used to mount the adapter to poles without pre-formed holes, then adaptability to different mounting structures is improved, but device complexity increases due to additional mounting components
Solution Approach 1:
The adapter is designed with multiple mounting options integrated into a single component. The adapter body includes both pre-formed holes for bolt mounting and slots for hose clamp mounting, providing universal adaptability to different pole types and mounting structures without requiring separate mounting devices.
Data Source
AI summary
An adapter for mounting cable hangers includes: a floor, a ceiling and side walls that span the floor and ceiling, wherein the ceiling includes a mounting hole; and a cross-member that extends between the side walls that defines at least one window between the cross-member, the floor and one of the side walls.