Low-PIM Polymeric Angle Adapters for Base Station Cable Support
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Solution Overview
Problem
Conventional cable hanger assemblies near cellular base station antennas generate passive intermodulation interference due to loose metal-to-metal contacts and corrosion between dissimilar metals, reducing signal quality and data capacity.
Innovation Solution
Low-PIM angle adapters and cable hanger assemblies made from or coated with polymeric materials, eliminating metal-to-metal contacts and using features like box frames, slot frames, and cable ties to securely attach cables to galvanized steel support structures, thereby reducing passive intermodulation interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal brackets and hardware are used to support cables near base station antennas, then structural strength and cable support capability are improved, but passive intermodulation interference increases due to loose metal-to-metal contacts and corrosion
Solution Approach 1:
The patent introduces a polymeric material as an intermediary between metal components (cable hanger, angle adapter, support structure). This polymer layer prevents direct metal-to-metal contact while maintaining structural support, thereby eliminating the source of passive intermodulation interference generated by loose metallic connections near antenna elements
Solution Approach 2:
The patent employs composite construction combining polymeric materials with metal components. The angle adapter and cable hanger assemblies use polymer bodies with embedded or attached metal fastening elements, creating a composite structure that provides both the mechanical strength of metal and the PIM-reducing properties of polymer materials
2Reliability
If dissimilar metals (stainless steel and galvanized steel) are used in cable support structures, then corrosion resistance is improved, but passive intermodulation interference increases due to galvanic corrosion between dissimilar metals
Solution Approach 1:
The polymeric material serves as a galvanic isolation barrier between dissimilar metals. By placing the polymer between the stainless steel set screw/angle adapter and the galvanized steel support structure, the patent prevents galvanic cell formation while still allowing mechanical fastening, thus eliminating both corrosion and PIM generation at the interface
Solution Approach 2:
The patent applies different material properties to different parts of the assembly: polymer where PIM prevention is critical (contact surfaces near antennas), and metal where structural strength is needed (fastening elements). This localized material selection optimizes both corrosion resistance and PIM performance
Data Source
AI summary
A low passive intermodulation (PIM) angle adapter fabricated from or coated with a polymeric material supports one or more cable support hangers. The low-PIM angle adapter includes a box frame integrally formed with a slot frame, where the box frame supports one or more cable hangers and the slot frame slides onto a support structure to position the angle adapter on the support structure. The low-PIM angle adapter also includes one or more cable tie slots the receive cable ties that secure the angle adapter to the support structure. Various embodiments include differently shaped box frames designed to support one or more cable hangers, such hex, rectangular, trapezoidal and square box frames. The box frames may include multiple receptacles for receiving multiple cable hangers. Cable blocks and brackets also may be used to connect multiple cable hangers to a single receptacle of the low-PIM angle adapter.