EMI Shield: Frequency Range 30 MHz to 6 GHz

Q: What is the primary function of an EMI shield in a server backplane connector?

To block electromagnetic interference, ensuring reliable data transmission and preventing signal degradation in high-speed server environments.

Q: How do you test the effectiveness of an EMI shield?

Using standardized methods like IEC 61000-4-3 for radiated immunity and EN 55032 for emissions, measuring shielding effectiveness in decibels across specified frequency ranges.

Component Specifications

Definition

An EMI shield is a conductive enclosure or barrier designed to contain or block electromagnetic interference (EMI) emitted by electronic components, particularly in high-speed computer server backplane connectors. It prevents crosstalk, reduces electromagnetic emissions, and ensures compliance with regulatory standards by maintaining signal integrity and minimizing data transmission errors in server assemblies.

Working Principle

Works by reflecting, absorbing, or redirecting electromagnetic waves using conductive materials (e.g., metals, conductive coatings) to create a Faraday cage effect, isolating sensitive connector circuits from external EMI sources and internal emissions.

Materials

Typically made from beryllium copper, stainless steel, aluminum alloys, or nickel-plated steel; may include conductive elastomers or gaskets for sealing; thickness ranges from 0.1mm to 0.5mm depending on shielding effectiveness requirements.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Dimensions	Custom-fit to connector assembly
Frequency Range	30 MHz to 6 GHz
Contact Resistance	<10 mΩ
Operating Temperature	-40°C to 85°C
Shielding Effectiveness	≥40 dB at 1 GHz

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 61000-4-3, MIL-STD-461, EN 55032

Parent Products

This component is used in the following industrial products

Computer Server Backplane Connector Assembly

High-density interconnect assembly for server motherboard-to-peripheral communication

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Engineering Analysis

Risks & Mitigation

Inadequate shielding leading to data corruption
Material corrosion reducing conductivity
Improper installation causing gaps in shielding

FMEA Triads

Trigger: Poor material selection or thin gauge
Failure: Insufficient shielding effectiveness, EMI leakage
Mitigation: Use certified materials with ≥40 dB effectiveness and regular compliance testing

Trigger: Mechanical stress or vibration
Failure: Shield deformation or detachment, compromised integrity
Mitigation: Design with robust mounting features and conduct vibration testing per industry standards

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.1mm for dimensional fit, shielding effectiveness within ±2 dB of spec

Test Method

Radiated emissions testing per EN 55032, conducted immunity per IEC 61000-4-6

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 EMI Shield

Manufacturer profiles associated with EMI Shield.

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Frequently Asked Questions

What is the primary function of an EMI shield in a server backplane connector?