Antenna Cable Mounting Bracket Layout for Low-PIM Routing
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Solution Overview
Problem
Existing antenna tower mounts face challenges in securely managing cables to prevent swaying and passive intermodulation (PIM) generation due to conductive items in high RF energy environments, particularly when multiple radio and antenna units are densely packed.
Innovation Solution
A cable mounting bracket system featuring clamping members, rods, and a main panel with apertures, which secures cable hangers at a distance from the mounting structure, minimizing metal-to-metal contact and using polymeric hangers to reduce PIM, and can be combined with expansion brackets and extender rails for increased mounting capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional cable support brackets are mounted directly to the pipe with metal-to-metal contact, then cable securing is achieved, but passive intermodulation (PIM) is generated in high RF energy environments
Solution Approach 1:
The patent introduces non-conductive elements (polymeric cable hangers, non-conductive brackets, or coated metal surfaces) as intermediaries between conductive components. These intermediaries break the direct metal-to-metal contact path while still providing mechanical support for cable securing, thereby eliminating PIM generation in high RF energy environments.
Solution Approach 2:
The patent changes the electrical parameter (conductivity) of the mounting components by using non-conductive materials or applying non-conductive coatings to metal components. This parameter change transforms the components from conductive to non-conductive, preventing the formation of PIM-generating conductive paths while maintaining structural integrity for cable support.
2Stability of the object's composition
If multiple cable support brackets are installed to secure all cables, then cable organization and stability are improved, but device complexity and installation time increase
Solution Approach 1:
The patent combines multiple cable support functions into a single integrated bracket structure. The bracket includes a main body mounted to the pipe and multiple arms or attachment points that can secure multiple cables simultaneously, reducing the total number of separate brackets needed while maintaining effective cable organization and stability.
Solution Approach 2:
The patent designs a universal bracket structure that can accommodate multiple cables of different sizes and types through adjustable arms, slots, or universal attachment mechanisms. This multi-functional design allows a single bracket type to serve multiple purposes, reducing the variety and quantity of different bracket components needed.
3Area of stationary object
If cable hangers are positioned close to the mounting structure, then space is conserved, but PIM risk increases due to proximity to RF sources
Solution Approach 1:
The patent uses non-conductive materials as intermediaries between the mounting structure and cable hangers, allowing cable hangers to be positioned closer to the structure without increasing PIM risk. The non-conductive material breaks the conductive path, enabling space-efficient positioning while maintaining electrical isolation from RF sources.
4Strength
If traditional metal brackets are used for mounting, then structural strength is achieved, but PIM generation occurs in high RF environments
Solution Approach 1:
The patent employs composite material constructions, such as metal brackets with non-conductive coatings (polymer, paint, or anodization), or hybrid structures combining metal structural elements with non-conductive fastening components. This composite approach maintains the mechanical strength benefits of metal while eliminating the PIM-generating conductive surfaces through the non-conductive layer.
Data Source
AI summary
The present disclosure describes a cable mounting bracket, The bracket includes a pair of clamping members configured to be secured to a mounting structure, a pair of rods extending outwardly from the pair of clamping members, and a main panel comprising a plurality of apertures, each aperture being configured to receive and secure a cable hanger to the main panel. The pair of rods couples the main panel with the pair of clamping members and positions the main panel a distance from the mounting structure.