Dielectric Bushing Mounting Assembly for Passive Intermodulation Mitigation
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Solution Overview
Problem
Passive-intermodulation in mechanical components of utility and communications systems introduces interference into electromagnetic signals, degrading communication performance by causing non-linearities when mechanical components mate and transmit signals.
Innovation Solution
A passive-intermodulation-mitigating mounting assembly is introduced, featuring a dielectric bushing made of insulating material that physically and electrically isolates fasteners from brackets, reducing electrical conduction and non-linearities, thereby inhibiting passive-intermodulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If mechanical components (fasteners, brackets) are mated together to form a mounting assembly, then structural strength and mechanical stability are improved, but passive-intermodulation occurs causing signal interference and degraded communication performance
Solution Approach 1:
A dielectric bushing is introduced as an intermediary component between the electrically conductive fastener and the electrically conductive bracket. The bushing physically receives the fastener and provides electrical isolation, preventing direct electrical contact between metal components while maintaining mechanical structural integrity. This mediator eliminates the harmful passive-intermodulation effect without compromising the structural strength provided by the mated components.
2Ease of manufacture
If electrically conductive components are mated to provide mechanical support, then ease of manufacture and structural integrity are improved, but electrical conduction between components causes non-linearities and signal degradation
Solution Approach 1:
The dielectric bushing serves as a simple intermediary component that is easy to manufacture and integrate into existing mounting assemblies. The bushing can be molded from common dielectric materials and inserted into the fastener-bracket interface, providing electrical isolation without complicating the manufacturing process. This maintains ease of manufacture while significantly improving signal quality by eliminating non-linearities caused by direct metal-to-metal contact.
3Force
If metal fasteners directly contact metal brackets, then mechanical coupling strength is improved, but electrical contact between components generates passive-intermodulation of electromagnetic signals
Solution Approach 1:
The dielectric bushing is positioned to receive the metal fastener, allowing the fastener to maintain full mechanical coupling strength with the bracket while the bushing's dielectric material prevents electrical contact. The bushing's internal structure can be designed to maximize mechanical support transmission while its outer surface provides electrical isolation, thus maintaining mechanical coupling strength while eliminating electromagnetic signal interference.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces interference in electromagnetic signals, enhancing communication performance by isolating mechanical components and minimizing signal degradation.
Implementation Method 1
The bushing can include a non-conductive material such as an insulating or dielectric material. The bushing can be configured for insertion into the first through hole or the second through hole, and the first bushing can physically and electrically isolate the fastener from the first bracket or the second bracket.
Data Source
AI summary
A passive-intermodulation-mitigating mounting assembly for a fixture, such as can be affixed to a utility or communications monopole can include a first bracket and a second bracket respectively defining a first through hole and a second through hole. In some examples, a mounting plate supports an antenna or a radio. A fastener can extend through the first through hole and the second through hole, for instance to couple the first bracket with the second bracket to attach the mounting assembly to a fixture. The passive-intermodulation-mitigating mounting assembly can include a bushing that can be inserted into a through hole, and the bushing can physically and electrically isolate the fastener from one or more of the brackets. The isolation of the bushing helps inhibit the passive-intermodulation of the mounting assembly when the fastener extends, via the first bushing, through at least one of the through holes.