Shielding/Outer Conductor: Frequency Range DC to 18GHz

Component Specifications

Definition

The Shielding/Outer Conductor is a conductive layer surrounding the inner conductor(s) in coaxial or shielded transmission lines. It serves dual functions: providing electromagnetic shielding to prevent external interference from affecting signal quality and containing electromagnetic emissions from the inner conductor. This component typically consists of a metallic braid, foil, or solid tube that forms a continuous conductive path along the transmission line length, ensuring proper impedance matching and signal integrity.

Working Principle

The Shielding/Outer Conductor operates on the principle of electromagnetic containment and Faraday cage effect. When properly grounded, it creates an equipotential surface that reflects or absorbs external electromagnetic fields, preventing them from penetrating to the inner conductor. Simultaneously, it contains the electromagnetic field generated by the signal-carrying inner conductor, minimizing radiation losses and preventing interference with adjacent equipment. The conductive layer maintains consistent characteristic impedance along the transmission line by providing a controlled return path for signal currents.

Materials

High-conductivity copper alloys (C11000, C10100), aluminum alloys (6061, 5052), tinned copper, silver-plated copper, or stainless steel for corrosive environments. Braided versions use multiple fine wires (typically 0.1-0.3mm diameter) with 85-95% coverage. Foil shields employ aluminum or copper laminated with polyester or polypropylene backing.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Impedance	50Ω or 75Ω standard
DC Resistance	<10mΩ/m
Braid Coverage	85-95%
Frequency Range	DC to 18GHz
Temperature Range	-55°C to +125°C
Diameter Tolerance	±0.1mm
Shielding Effectiveness	>90dB at 1GHz

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 Line

A conductive pathway within a phase shifter that carries electrical signals between components.

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Engineering Analysis

Risks & Mitigation

Insufficient shielding causing signal degradation
Corrosion leading to increased resistance
Mechanical damage compromising integrity
Improper grounding creating ground loops
Impedance mismatches causing signal reflections

FMEA Triads

Trigger: Corrosion of conductive materials
Failure: Increased resistance and reduced shielding effectiveness
Mitigation: Use corrosion-resistant materials (tinned copper, stainless steel), apply protective coatings, ensure proper environmental sealing

Trigger: Mechanical stress during installation
Failure: Braid breakage or foil tearing compromising continuity
Mitigation: Follow minimum bend radius specifications, use strain relief, implement proper handling procedures

Trigger: Poor termination connections
Failure: Increased contact resistance and impedance discontinuities
Mitigation: Use proper crimping tools, follow termination torque specifications, implement connection testing protocols

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.1mm diameter, ±2% impedance variation, shielding effectiveness within 3dB of specification across frequency range

Test Method

IEC 61196-1 for electrical properties, MIL-STD-1344A for shielding effectiveness, ASTM B193 for conductivity testing, visual inspection per IPC-A-610

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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Manufacturers of Shielding/Outer Conductor

Manufacturer profiles associated with Shielding/Outer Conductor.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the primary function of the Shielding/Outer Conductor in transmission lines?

The primary function is dual: providing electromagnetic interference (EMI) protection by shielding the inner conductor from external noise, and preventing signal radiation from the transmission line that could interfere with other equipment.

How does braid coverage percentage affect shielding performance?

Higher braid coverage (typically 85-95%) provides better shielding effectiveness, especially at higher frequencies. Below 80% coverage, shielding effectiveness decreases significantly, particularly above 100MHz.

What materials are commonly used for Shielding/Outer Conductors?

Copper alloys offer the best conductivity, aluminum provides lighter weight, tinned copper improves corrosion resistance, and silver plating enhances high-frequency performance. Material selection depends on application requirements for conductivity, weight, flexibility, and environmental resistance.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Shielding/Outer Conductor