Sealed Coaxial Drop Cable Structure Against Moisture Migration
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Solution Overview
Problem
Conventional coaxial cables are prone to moisture ingress due to abrasions, rodent damage, and environmental exposure, leading to corrosion and signal loss, as moisture can flow through gaps in the outer jacket and conductive foil layers, causing damage to internal components.
Innovation Solution
A tri-shield coaxial cable design featuring an inner conductor, dielectric, inner conductive foil layer, braided shield, and an outer jacket with a bonded outer conductive foil layer, where the outer foil layer includes a sealant to form a sealed joint, preventing moisture from passing through and protecting the cable from corrosion and signal loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional coaxial cable is used with standard outer jacket and conductive foil layers, then the cable structure is simple and manufacturing is easy, but moisture can penetrate through gaps and abrasions causing corrosion and signal loss
Solution Approach 1:
The patent implements a nested multi-layer shield structure where an inner conductive foil layer is surrounded by an inner braided shield, which is in turn surrounded by an outer conductive foil layer, and finally an outer braided shield. Each layer is positioned concentrically within the next, creating a nested configuration that provides progressive moisture and EMI protection while maintaining cable integrity.
Solution Approach 2:
The patent combines multiple material types and structures to create a composite shielding system: conductive foil layers (aluminum or copper), braided shield layers (copper or aluminum), dielectric materials for insulation, and adhesive bonding agents. This composite approach leverages the complementary strengths of each material to achieve superior moisture protection and electromagnetic shielding.
2Strength
If the outer jacket is made thicker and more protective to prevent abrasions and rodent damage, then mechanical strength and protection are improved, but the cable becomes stiffer and harder to install
Solution Approach 1:
The outer jacket is constructed as a composite structure combining a robust outer layer for mechanical protection against abrasion and rodent damage with an inner adhesive layer that bonds to the outer conductive foil. This composite design maintains flexibility while providing enhanced strength, allowing the cable to be both durable and installable in aerial applications.
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 sealed joint effectively prevents moisture from reaching the internal components, thereby protecting the coaxial cable from corrosion and signal loss, ensuring reliable performance even in exposed outdoor installations.
Implementation Method 1
The first longitudinal edge and the mating region are configured to be joined together by a sealant along a length of the first longitudinal edge
Implementation Method 2
moisture that enters the outer jacket is prevented from passing through the outer conductive foil layer
Data Source
AI summary
A coaxial cable may include a center conductor; a dielectric insulator configured to surround the center conductor; an inner conductive foil layer configured to surround the dielectric; a braided shield layer configured to surround the inner conductive foil layer; and an outer jacket configured to surround the outer conductive foil layer. The outer conductive foil layer may be bonded to the outer jacket; the outer conductive foil layer may include a first lateral region, a second lateral region, and a sealant; the first and second lateral regions may be configured to overlap each other; the sealant may be disposed between the first lateral region and the second lateral region to form a sealed joint; and the sealed joint may be configured to prevent moisture from passing the outer conductive foil layer and migrating along the coaxial cable, which may prevent signal loss or coaxial cable connector damage.