Key Design Features
Precision Dielectric Materials:
Fluoropolymers (e.g., PTFE) or air-entangled foams minimize dielectric loss while maintaining stable permittivity at high frequencies.
Example: 0.81 mm micro coax with expanded PTFE dielectric supports 110 GHz in satellite communication test systems.
Controlled Impedance:
Strict 50 Ω or 75 Ω impedance tolerance (±1%) prevents reflections in high-speed digital circuits (e.g., 400G Ethernet).
Skin Effect Mitigation:
Silver-plated or gold-coated conductors reduce resistance at GHz-level frequencies, where current flows predominantly on the conductor surface.
Applications
6G Research: Transmitting terahertz (THz) signals in experimental wireless networks.
Radar Systems: Enabling compact phased-array antennas for automotive LiDAR and military radar.
High-Speed Interconnects: Connecting CPUs to optical transceivers in data centers.
2. Ultra-Low Signal Loss (<0.1 dB/cm at 60 GHz)
Minimizing attenuation is critical for preserving signal integrity in power-sensitive and long-chain systems.
Loss-Reduction Strategies
Advanced Conductor Materials:
Oxygen-free copper (OFC) or copper-clad aluminum (CCA) cores with smooth surfaces reduce conductor loss.
Low-Density Dielectrics:
Foam-based or air-core dielectrics lower the effective dielectric constant (εᵣ ≈ 1.2–2.1), reducing capacitive losses.
Example: 1.13 mm micro coax achieves 0.05 dB/cm loss at 60 GHz using nitrogen-injected foam PE.
Optimized Shielding Geometry:
Triple-layer shields (foil + braid + foil) minimize leakage while avoiding bulkiness.
Applications
Medical Endoscopes: Transmitting 4K video over 3-meter cables without amplifiers.
Satellite Payloads: Maintaining signal clarity across multi-meter cable runs in space.
IoT Sensors: Extending battery life in wireless sensors by reducing transmit power needs.
3. Superior Electromagnetic Shielding (>120 dB Effectiveness)
Micro coaxial cables must prevent both external interference and signal leakage, especially in dense electronic environments.
Shielding Innovations
Multi-Layer Shielding Architectures:
Combination of aluminized polyester foil (100% coverage) + high-density braid (95% coverage) + conductive polymer outer jacket.
Hermetic Sealing:
Laser-welded connectors and seamless outer conductors eliminate gaps in medical implants or vacuum environments.
Frequency-Tuned Shielding:
Magnetic alloy coatings (e.g., Mu-metal) suppress low-frequency interference, while nanostructured shields target GHz-range noise.
Applications
Cardiac Pacemakers: Preventing EMI from smartphones or MRI machines.
Military UAVs: Resisting jamming signals in encrypted communication links.
Quantum Computing: Shielding qubit control lines from decoherence-causing noise.
Technical Comparison: Micro Coax vs. Standard Coax
Parameter Micro Coaxial Cable Standard RG-174 Coax
Frequency Range DC–110 GHz DC–6 GHz
Attenuation @ 10 GHz 0.3 dB/m 2.1 dB/m
Shielding Effectiveness 120–140 dB 90–100 dB
Bend Radius 2x diameter 10x diameter
Typical Diameter 0.5–2.0 mm 2.8 mm
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