Cable Mounting Bracket Structure for Low-PIM Antenna Towers
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Solution Overview
Problem
Existing antenna tower mounts for antennas, radios, and cables often lead to undesirable passive intermodulation (PIM) due to conductive items generating RF energy, and there is a need for efficient cable management to prevent swaying in the wind.
Innovation Solution
A cable mounting bracket system that includes clamping members with flanged ends, rods for securing to a mounting structure, and a main panel with apertures for securing cable hangers, designed to minimize PIM by reducing metal-to-metal contact and providing secure cable management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional cable support brackets with metal-to-metal contact are used, then cables can be securely mounted to the tower, but passive intermodulation (PIM) is generated due to conductive items in high RF energy environments
Solution Approach 1:
The patent introduces non-conductive elements (such as polymer coatings, rubber grommets, or plastic spacers) as intermediary materials between metal components in the cable mounting bracket system. These intermediaries break the direct metal-to-metal contact path while maintaining the mechanical securing function, thereby eliminating PIM generation points while preserving cable mounting reliability
Solution Approach 2:
The patent changes the electrical conductivity parameter of the mounting bracket components by applying non-conductive coatings or selecting non-conductive materials for specific parts. This parameter change transforms the bracket from a conductive structure that generates PIM to a non-conductive or partially non-conductive structure that prevents PIM while maintaining mechanical integrity
2Ease of operation
If multiple metal brackets and hardware are used to secure cables, then organized cable management is achieved, but metal-to-metal contact and relative movement generate PIM
Solution Approach 1:
The patent employs composite material construction for the cable mounting brackets, combining metal structural elements with non-conductive coating layers or non-conductive fastening components. This composite approach maintains the mechanical strength and organizing capability of metal brackets while the non-conductive elements prevent PIM-generating metal-to-metal contacts
Solution Approach 2:
The patent utilizes inexpensive non-conductive components such as plastic cable ties, rubber grommets, or polymer spacers that can be easily installed and replaced. These low-cost non-conductive elements effectively eliminate PIM generation points without requiring complex design changes to the overall bracket system
Data Source
AI summary
The present disclosure describes a cable mounting bracket. The cable mounting bracket includes a pair of clamping members configured to be secured to a mounting structure. Each clamping member has at least one flanged end. The cable mounting bracket further includes a pair of rods in which each rod extends through a mounting aperture of each clamping member. The cable mounting bracket further includes a main panel secured to the at least one flanged end of each clamping member. The main panel includes a plurality of apertures with at least one of the plurality of apertures being configured to receive and secure a cable hanger to the main panel. The main panel is planar and elongated in a dimension orthogonal to an axis of the mounting structure. Other cable mounting brackets are described herein.