INDUSTRY COMPONENT

Dielectric Insulator

Dielectric insulator for high-frequency RF coaxial connectors providing electrical isolation and signal integrity.

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Component Specifications

Definition
A dielectric insulator is a critical component in high-frequency RF coaxial connectors that electrically isolates the center conductor from the outer conductor while maintaining precise impedance matching. It prevents signal leakage, reduces electromagnetic interference, and ensures stable transmission of radio frequency signals up to microwave frequencies. The insulator's dielectric properties directly affect connector performance, including insertion loss, voltage standing wave ratio (VSWR), and phase stability.
Working Principle
The dielectric insulator functions by creating a controlled dielectric constant environment between the coaxial conductors. It maintains consistent impedance (typically 50Ω or 75Ω) by precisely spacing the inner and outer conductors. The material's low loss tangent minimizes signal attenuation, while its high dielectric strength prevents electrical breakdown. During RF signal transmission, the insulator confines electromagnetic fields within the coaxial structure, preventing radiation losses and maintaining signal integrity across the connector interface.
Materials
PTFE (Polytetrafluoroethylene) - Grade: Virgin PTFE with dielectric constant 2.1, loss tangent <0.0002 at 10GHz; Ceramic (Alumina) - Al₂O₃ 96-99.8% purity with dielectric constant 9.8, thermal conductivity 20-30 W/m·K; PEEK (Polyether Ether Ketone) - Reinforced with glass fibers for enhanced mechanical strength; LCP (Liquid Crystal Polymer) - For high-temperature applications up to 240°C
Technical Parameters
  • VSWR <1.2:1
  • Impedance 50Ω or 75Ω
  • Loss Tangent <0.0002 to 0.002 at 10GHz
  • Insertion Loss <0.1dB at 18GHz
  • Voltage Rating 500V to 5kV RMS
  • Frequency Range DC to 40GHz
  • Temperature Range -65°C to +200°C
  • Dielectric Constant 2.1-9.8
Standards
IEC 61169, MIL-PRF-39012, DIN 47223, ISO 9001

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Dielectric Insulator.

RF dielectric insulator coaxial connector insulator PTFE insulator ceramic insulator high-frequency insulation impedance matching component RF signal integrity Dielectric Insulator Dielectric Insulator in Computer, Electronic and Optical Product Manufacturing

Parent Products

This component is used in the following industrial products

High-Frequency RF Coaxial Connector

Precision coaxial connector for high-frequency signal transmission in communication equipment.

View Product Details

High-Frequency RF Connector

Precision connector for transmitting radio frequency signals in electronic assemblies

View Product Details

Transmission Line

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

View Product Details

Engineering Analysis

Risks & Mitigation
  • Dielectric breakdown under high voltage
  • Impedance mismatch due to manufacturing tolerances
  • Thermal expansion causing mechanical stress
  • Moisture absorption altering dielectric properties
  • Corona discharge in high-altitude applications
FMEA Triads
Trigger: Material impurities or voids in dielectric
Failure: Partial discharge leading to dielectric breakdown
Mitigation: Implement 100% X-ray inspection for material homogeneity, use vacuum degassing during manufacturing, apply corona-resistant coatings
Trigger: Thermal cycling in extreme environments
Failure: Cracking due to coefficient of thermal expansion mismatch
Mitigation: Select materials with matched CTE, design with stress-relief features, implement thermal shock testing per MIL-STD-202
Trigger: Moisture ingress in humid conditions
Failure: Increased dielectric constant and loss tangent
Mitigation: Use hydrophobic materials like PTFE, apply moisture barriers, specify hermetic sealing for critical applications

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±0.02mm on critical dimensions, ±2% on dielectric constant
Test Method
Vector Network Analyzer (VNA) measurements for S-parameters, Time Domain Reflectometry (TDR) for impedance verification, High-Potential testing per IEC 60112, Thermal cycling per MIL-STD-883

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the primary function of a dielectric insulator in RF coaxial connectors?

The primary function is to electrically isolate the center conductor from the outer conductor while maintaining precise impedance matching to ensure minimal signal reflection and maximum power transfer in high-frequency applications.

How does dielectric constant affect connector performance?

Dielectric constant determines the insulator's ability to store electrical energy. Lower values (like PTFE's 2.1) reduce signal propagation delay and capacitance, enabling higher frequency operation with lower loss, while higher values (like ceramic's 9.8) allow for smaller physical dimensions at the cost of increased signal attenuation.

What are common failure modes of dielectric insulators?

Common failures include dielectric breakdown from voltage surges, thermal degradation at high temperatures, moisture absorption causing impedance shifts, mechanical cracking from vibration or thermal cycling, and corona discharge in high-voltage applications.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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.

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Dielectric Core Material Dielectric Layer