Plastic Antenna Mounting Assembly for Passive Intermodulation Mitigation
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Solution Overview
Problem
Passive intermodulation interference (PIM) is a significant issue in mobile radio antenna installations, caused by factors like loose cable connections and incompatible interfaces, which affects the operation of antenna components.
Innovation Solution
A plastic-based assembly for installing mobile radio antenna systems, featuring a bracket with inner curvatures for clamping conduits, plastic fasteners, and hollow cuboidal arms forming a U-shape frame, designed to eliminate metal-metal or metal-plastic interactions that cause PIM, with components like threaded rods, washers, and hex nuts made of plastic to secure the assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal components and fasteners are used in the antenna assembly, then structural strength and mechanical stability are improved, but passive intermodulation interference is generated affecting radio operation
Solution Approach 1:
The patent removes all metal components from the antenna support assembly, extracting the harmful metal elements that cause passive intermodulation interference. The bracket, fasteners, arms, support plate, and support bar are all made from non-metallic plastic materials, completely eliminating metal-metal and metal-plastic interactions that generate PIM while maintaining structural integrity through engineered plastic construction.
Solution Approach 2:
The patent employs composite plastic construction for all assembly components. The bracket is made from plastic, fasteners are made from plastic (including threaded bolts, threaded rods, washers, and hex nuts), and the structural arms and support elements are made from plastic material. This composite non-metallic approach provides sufficient mechanical strength while preventing passive intermodulation interference.
2Strength
If traditional metal fasteners and brackets are used, then installation strength is improved, but installation complexity increases due to PIM mitigation requirements
Solution Approach 1:
The patent applies homogeneity by making all components of the assembly - bracket, fasteners, arms, support plate, and support bar - from the same non-metallic plastic material. This uniform material selection simplifies the design and installation process, as there are no special requirements for preventing metal interactions, while still providing adequate installation strength for securing antenna systems.
3Object-generated harmful factors
If plastic materials are used for all components, then passive intermodulation interference is eliminated, but structural strength may be reduced
Solution Approach 1:
The patent utilizes engineered plastic materials with enhanced mechanical properties to replace metal components. The bracket, fasteners (threaded bolts, threaded rods, washers, hex nuts), and structural elements are constructed from plastic that provides sufficient structural strength for antenna support while completely eliminating passive intermodulation interference associated with metal materials.
Data Source
AI summary
An assembly for installing mobile radio antenna systems that do not cause any passive intermodulation interferences. The assembly includes brackets for clamping around conduits, support bars, support plates, arms, frame, and the like for coupling different components of the mobile radio antenna system. The brackets, threaded rods, threaded bolts, hex nuts, and the like of the assembly are made from plastic to avoid generating interferences.