- Define Transmission Requirements
Frequency & Bandwidth: Choose cables based on signal type and frequency range. For example:
High-frequency signals (e.g., 5G, mmWave radar): Requires cables supporting 40 GHz or higher16.
Digital audio (e.g., SPDIF): Select 75Ω impedance to ensure compatibility with device interfaces45.
Attenuation Tolerance: Use low-loss cables (e.g., <0.5 dB/m@6 GHz) for long-distance transmission to minimize signal degradation23. 2. Evaluate Environmental Conditions Temperature Range: Extreme heat (200°C): Opt for fluoropolymer jackets (e.g., FEP)23. Low temperatures or outdoor use: Cold-resistant materials (e.g., PTFE insulation) for -55°C environments34. Mechanical Stress: For frequent bending (e.g., hinges in security devices), prioritize high flex life (>100,000 cycles)26.
3. Size and Construction
Outer Diameter Constraints:
Ultra-compact devices (e.g., TWS earphones): Micro coaxial cables with 0.5–1.0 mm outer diameter26.
Industrial equipment wiring: 1.2–2.2 mm outer diameter to balance durability and flexibility34.
Conductor Material:
High conductivity: Silver-plated copper cores reduce resistance and enhance high-frequency signal integrity27.
Cost-sensitive applications: Oxygen-free copper (OFC) as an economical alternative78.
4. Shielding and EMI Resistance
EMC Suppression: Dual-layer shielding (aluminum foil + tin-plated copper braid) blocks >90% of EMI, ideal for automotive or medical electronics12.
Grounding: Ensure reliable shielding-to-connector soldering to prevent signal leakage68.
5. Connector Compatibility
Interface Types:
Miniature devices: Use ultra-small connectors like IPEX or MMCX16.
High-speed data: Match cable impedance (50Ω or 75Ω) to USB4 or HDMI 2.1 interfaces58.
Termination: Injection molding or laser welding improves connector stability68.
6. Certifications and Standards
Environmental Compliance: Select lead-free, halogen-free materials compliant with RoHS 3.028.
Industry Certifications:
Automotive electronics: Pass MIL-STD-202 vibration testing34.
Medical devices: Meet ISO 13485 biocompatibility requirements23.
Application-Specific Specification Examples
Scenario Recommended Specifications Source
Medical endoscopes 0.8 mm outer diameter, PTFE insulation, dual-layer shielding, ≤3 mm bend radius 12
5G base station antennas 50Ω impedance, 40 GHz bandwidth, FEP jacket 16
Vehicle ADAS systems High-temperature resistance (200°C), aluminum foil shielding, tin-plated copper 34
AR/VR headset audio 75Ω impedance, 24AWG silver-plated core, USB-C interface 68
Key Parameter Comparison
Parameter Budget Option High-Performance Option
Conductor Oxygen-free copper (OFC) Silver-plated or single-crystal copper
Shielding Single-layer aluminum foil Aluminum foil + copper braid dual-layer
Attenuation 1.2 dB/m@6 GHz 0.3 dB/m@6 GHz
Price $0.5–1.0/m $2.0–5.0/m
Summary: Selecting micro coaxial cables requires balancing signal requirements, environmental resilience, mechanical strength, and cost. Prioritize high-frequency performance, EMI resistance, and miniaturization, while ensuring compliance with industry certifications for reliability13.
Keywords: Micro coaxial cable selection, impedance matching, EMI shielding, RoHS 3.0, high-frequency cables.
