Non-metal Cable Clamp Reduces Intermodulation
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Solution Overview
Problem
Metallic components in cable clamps cause intermodulation RF signals that interfere with wireless telecommunication signals, degrading call quality and potentially causing dropped calls, due to non-linearity, ferromagnetic materials, and metal-to-metal contacts.
Innovation Solution
A clamp design featuring non-ferromagnetic metal components and plastic insulation to maximize the distance between metal components and radiating apertures, using non-metal curled coupling members and cable ties, and positioning metal components on the back side to minimize interference, while ensuring secure cable mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal clamping structures are used to prevent cable from dropping during fire, then cable security is improved, but intermodulation RF signals are generated that interfere with wireless telecommunication signals
Solution Approach 1:
The clamp is divided into multiple functional components: a mounting plate for structural support, a tube for cable positioning, non-metal curled coupling members for cable securing, and metal cable ties positioned away from radiating elements. This segmentation allows each component to perform its specific function while minimizing overall interference.
Solution Approach 2:
Metal components that generate intermodulation signals are extracted from proximity to the radiating apertures. The metal cable ties are positioned at locations远离 the cable's radiating elements, and the mounting plate is designed with openings that prevent metal-to-metal contacts near the apertures, thereby removing the source of harmful RF signals.
Solution Approach 3:
Non-metal coupling members act as intermediaries between the metal mounting structure and the cable. These plastic or polymer components provide the necessary mechanical coupling and cable securing functions without generating intermodulation signals, mediating between the structural requirements and the RF interference constraints.
2Object-generated harmful factors
If plastic clamps are used to avoid intermodulation signals, then RF signal quality is improved, but cable security during fire is compromised
Solution Approach 1:
The clamp assembly uses composite construction combining non-metal materials (plastic mounting plate, polymer coupling members) for RF-transparent components with metal components (metal cable ties, mounting hardware) positioned away from radiating elements for structural support and fire resistance. This composite approach leverages the advantages of both material types.
Solution Approach 2:
The solution moves the metal components from the traditional dimension of direct cable contact near the radiating aperture to a different spatial dimension - positioned at the mounting plate level and secured through the tube structure, away from the RF-critical zone. This dimensional repositioning maintains security while reducing interference.
3Strength
If metal components are positioned close to radiating apertures for structural support, then mounting strength is improved, but intermodulation signals increase
Solution Approach 1:
Different parts of the clamp assembly have different material properties optimized for their local functions: the mounting plate uses metal for structural strength, the tube and coupling members use non-metal materials for RF transparency and cable positioning, and metal cable ties are used only where structural support is needed away from radiating elements. Each local region has quality matched to its specific requirement.
Data Source
AI summary
An apparatus comprising a clamp. The clamp can include a plate. The plate can include a mounting opening to accommodate a shaft of a bolt module there-through and to stop an end of the bolt module from passing through, and cable tie openings. The clamp can also include a tube projecting from the plate, where an opening in the tube is coaxial with the mounting opening. The clamp can also include a non-metal curled coupling member sized to wrap around a portion of a cable and a non-metal coupling spacer member having a base portion and spacing arms projecting from the base portion. Ends of the spacing arms can be configured to contact the curled coupling member and the base portion has an opening coaxial with the mounting opening and the opening in the tube. A clamp and cable assembly and methods of manufacturing the clamp and assembling the clamp and the cable are also disclosed.