Polymer Cable Support Bracket for Low-PIM Antenna Routing
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Solution Overview
Problem
In telecommunications equipment, especially near cellular antennas, conductive cable support systems can generate passive intermodulation (PIM) due to steel-on-steel contact and movement, leading to undesirable RF energy interactions and cable organization challenges.
Innovation Solution
A cable support bracket system with a non-conductive polymer-based material, featuring a base with apertures for cable hangers, a cable guide with a generally arced profile, and a bridge for securing cables, designed to minimize PIM by maintaining optimal cable bend radii and organization, while being easily mountable to antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional conductive cable support systems are used, then cable organization and support are achieved, but passive intermodulation (PIM) is generated due to steel-on-steel contact and movement
Solution Approach 1:
A non-conductive intermediate layer (polymer coating or non-conductive material) is introduced between the metal cable hanger and the metal bracket to prevent direct metal-to-metal contact. This intermediary layer eliminates the PIM-generating contact while still providing mechanical support and cable organization functionality.
Solution Approach 2:
The bracket assembly uses composite materials combining non-conductive polymers (for the coating or bridge component) with metal (for structural elements). This composite approach maintains mechanical strength and cable support while preventing conductive contact that causes PIM.
2Reliability
If cable support brackets are mounted near antennas, then cable security and organization are improved, but PIM is generated in the high RF energy environment
Solution Approach 1:
The non-conductive polymer bridge or coating acts as an intermediary that maintains cable security and support while preventing conductive pathways in the high RF environment near antennas, thereby eliminating PIM generation.
Solution Approach 2:
The conductive mechanical connection system is replaced with a non-conductive polymer-based system that provides the same mechanical support and cable security functions without generating electromagnetic interference or PIM.
3Ease of operation
If multiple cable hangers are secured to the base, then cable organization is enhanced, but the complexity of the support structure increases
Solution Approach 1:
The bracket base is designed as a universal multi-functional component that can accommodate multiple cable hangers of different sizes and types through standardized apertures. This single multi-functional base replaces what would otherwise require multiple separate support structures.
Solution Approach 2:
The support structure is segmented into modular components (base with apertures, removable bridge, individual cable hangers) that can be independently selected and configured. This segmentation allows flexible cable organization without requiring a complex integrated structure.
Data Source
AI summary
The present disclosure describes a cable support bracket. The cable support bracket may include a base configured to be mounted to an antenna, the base comprising a plurality of apertures, each aperture configured to receive a cable hanger; a cable guide having a generally arced outer profile, wherein the cable guide is coupled to or integral with the base and extends outwardly from one end of the base; and a plurality of cable hangers, each cable hanger secured in a respective aperture in the base. The cable support bracket may further include a bridge removably attached to the base, the bridge having a plurality of apertures, each bridge aperture configured to receive a respective cable hanger; and a second plurality of cable hangers, each cable hanger secured in a respective aperture in the bridge. Antenna assemblies and methods for organizing coaxial cable connections at a base station antenna are also provided.