What materials are commonly used to make RF couplers
RF Coupler Material Composition
Advanced material selection for optimal signal transfer, impedance matching, and durability across radio frequencies
Conductive Materials
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Primary Conductors Copper - Standard choice (97% IACS conductivity)
Applications: Microstrip lines, coaxial inner conductorsSilver - High-performance option (105% IACS)
Advantages: Excellent malleability and conductivityApplications: Premium couplersAluminum - Lightweight alternative (61% IACS)
Considerations: Higher cost limits widespread useApplications: Aerospace systems, large couplersGold plating - High-frequency solution
Benefits: Weight reduction with acceptable conductivityApplications: >10 GHz systems
Purpose: Oxidation prevention for stable performance
Dielectric Materials
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High-Frequency Dielectrics PTFE (Polytetrafluoroethylene)
Dielectric Constant: 2.1Alumina (Al₂O₃)
Advantages: Minimal signal loss at high frequenciesProperties: High thermal stability, mechanical strengthFR-4
Applications: Extreme temperature/power environmentsApplications: <1 GHz systems
Benefits: Cost-effective balance of properties
Structural Materials
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Brass (Copper-Zinc alloy)
Applications: Outer housings, connectorsStainless Steel
Advantages: Excellent machinability and rigidityApplications: Industrial/outdoor couplers
Properties: Superior corrosion resistance and strength
Material Selection Factors
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Key considerations for optimal material selection:
• Operating frequency range
• Power handling requirements
• Environmental conditions
• Cost-performance balanceHigh-performance designs prioritize low-loss dielectrics and high-conductivity metals, while balancing mechanical and environmental requirements.