Outer Conductor / Cable Shield for Coaxial Lines

Q: What is the difference between braided and foil shields?

Braided shields provide better flexibility and durability with 70-95% coverage, while foil shields offer 100% coverage but are less flexible and more prone to damage during installation.

Q: How does shield effectiveness affect transmission line performance?

Higher shielding effectiveness (measured in dB) reduces electromagnetic interference, improving signal-to-noise ratio and data integrity, particularly critical in high-frequency and sensitive measurement applications.

Q: What maintenance is required for outer conductor components?

Regular inspection for corrosion, physical damage, and continuity testing. Connector interfaces require periodic cleaning and torque verification to maintain proper shielding continuity.

Component Specifications

Definition

The outer conductor or shield is a critical component in coaxial transmission lines and shielded cables that provides electromagnetic interference (EMI) protection, signal integrity maintenance, and environmental shielding. It typically consists of a conductive layer surrounding the inner conductor, creating a controlled impedance environment and preventing external electromagnetic fields from interfering with the transmitted signal while containing the signal's electromagnetic field within the cable structure.

Working Principle

Functions through electromagnetic shielding principles where the conductive outer layer creates a Faraday cage effect, reflecting and absorbing external electromagnetic interference while containing the signal's electromagnetic field. In coaxial configurations, it serves as the return path for electrical currents, maintaining characteristic impedance through precise geometric relationships with the inner conductor.

Materials

Typically made from copper, aluminum, copper-clad aluminum, or tinned copper braids, foils, or solid tubes. May include silver-plated copper for high-frequency applications. Shield materials often combine multiple layers including metallic foils (aluminum or copper), braided wires, and conductive polymers. Common configurations: braided shield (85-95% coverage), foil shield (100% coverage), or combination foil-braid shields.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Impedance	50Ω, 75Ω, or 93Ω standard
Braid Angle	30-45 degrees
DC Resistance	<10 mΩ/m typical
Frequency Range	DC to 40+ GHz
Temperature Range	-55°C to +200°C
Coverage Percentage	70-100%
Shielding Effectiveness	60-120 dB typical

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

IEC 61196, MIL-DTL-17, ISO 6722, DIN 47245

Parent Products

This component is used in the following industrial products

Transmission Lines

Conductive pathways within a feed network that carry electrical signals or power between components.

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Engineering Analysis

Risks & Mitigation

Corrosion leading to increased resistance
Physical damage compromising shielding effectiveness
Improper termination creating ground loops
Electromagnetic leakage at connector interfaces
Material fatigue in flexible applications

FMEA Triads

Trigger: Corrosion due to environmental exposure
Failure: Increased resistance, signal attenuation, intermittent connections
Mitigation: Use corrosion-resistant materials (tinned copper, stainless steel), protective coatings, proper environmental sealing

Trigger: Mechanical stress during installation
Failure: Shield deformation, broken strands, reduced coverage percentage
Mitigation: Follow minimum bend radius specifications, use proper installation tools, implement strain relief

Trigger: Improper termination techniques
Failure: Shield discontinuity, ground loops, electromagnetic leakage
Mitigation: Use proper termination tools, follow manufacturer specifications, implement 360-degree shield termination where required

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.05mm for diameter, ±2% for impedance, shielding effectiveness within ±3dB of specification

Test Method

IEC 62153-4-3 for shielding effectiveness, MIL-STD-1344A for electrical continuity, ASTM B193 for conductivity

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Outer Conductor / Shield

Manufacturer profiles associated with Outer Conductor / Shield.

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Frequently Asked Questions

What is the difference between braided and foil shields?