Attenuation: Signal loss due to dielectric absorption and conductor resistance.
EMI/RFI: External interference disrupting signal accuracy.
Impedance Mismatch: Reflections caused by inconsistent impedance along the cable.
Phase Stability: Timing errors from temperature fluctuations or mechanical stress.
Micro coaxial cables address these issues through advanced materials and shielding.
2. Key Features of High-Performance Micro Coax
A. Low-Loss Dielectric Materials
Foam PTFE: Reduces dielectric loss (tan δ < 0.001) for frequencies up to 110 GHz. Air-Spaced Insulation: Minimizes attenuation in ultra-high-frequency (mmWave) cables. B. Precision Impedance Control 50Ω or 75Ω Options: Matched to system requirements to prevent reflections. Tolerance ≤ 1%: Ensures uniformity across the cable length. C. Multi-Layer Shielding Triple Shielding: Foil + braid + foil configurations for >100 dB EMI suppression.
Gold-Plated Connectors: Maintain conductivity and resist corrosion.
D. Phase Stability
Phase Tracking: ±1° per meter at 18 GHz (e.g., phase-stable cables for radar systems).
Temperature Compensation: Stable performance from -55°C to 200°C.
E. Flexibility and Durability
Ultra-Flexible Jackets: Silicone or FEP materials for tight bends in compact devices.
Corrosion-Resistant Armor: Stainless steel or silver-plated copper for harsh environments.
3. Top Micro Coaxial Cable Models for High-Frequency Integrity
A. M17/113-RG179 (MIL-DTL-17)
Frequency Range: DC to 40 GHz
Attenuation: 1.2 dB/m @ 10 GHz
Features: Silver-plated copper, PTFE dielectric, triple shielding.
Applications: Military radar, satellite test equipment.
B. RG316 (MIL-C-17)
Frequency Range: DC to 6 GHz
Attenuation: 0.8 dB/m @ 3 GHz
Features: Flexible silicone jacket, 50Ω impedance.
Applications: Drone telemetry, medical RF probes.
C. LMR-200 (Times Microwave)
Frequency Range: DC to 6 GHz
Attenuation: 0.6 dB/m @ 2.4 GHz
Features: Foam PE dielectric, UV-resistant jacket.
Applications: 5G small cells, Wi-Fi 6 routers.
D. Huber+Suhner SFSX-501 (Phase-Stable)
Frequency Range: DC to 65 GHz
Attenuation: 0.9 dB/m @ 40 GHz
Features: Air-spaced dielectric, phase stability ±0.5° per meter.
Applications: Quantum computing, aerospace telemetry.
**E. Gore GORE™ PHASEFLEX Microwave Assemblies
Frequency Range: DC to 90 GHz
Attenuation: <0.3 dB/m @ 60 GHz
Features: Phase-matched pairs, bend-insensitive design.
Applications: mmWave testing, phased array antennas.
4. How to Choose the Best Micro Coax for Your Application
Step 1: Define Frequency and Bandwidth
For <6 GHz: RG316 or LMR-200.
For 6–40 GHz: RG179 or phase-stable cables.
For 40+ GHz: Huber+Suhner SFSX-501 or Gore assemblies.
Step 2: Evaluate Environmental Conditions
High Temperatures: PTFE-jacketed cables (e.g., RG179).
Flexibility: Silicone-insulated RG316.
Outdoor Use: UV-resistant LMR-200.
Step 3: Prioritize Signal Integrity Metrics
Lowest Attenuation: Air-spaced dielectrics (Huber+Suhner).
Phase Stability: Phase-stable or phase-matched cables.
EMI Resistance: Triple-shielded RG179.
Step 4: Consider Connector Compatibility
Common Types: SMA, SMP, or 2.92 mm connectors for mmWave.
VSWR: Ensure connectors have VSWR <1.2:1 at target frequency.
5. Installation Tips for Maximizing Signal Integrity
Avoid Tight Bends: Exceeding bend radius increases attenuation.
Use Proper Termination: Cold-weld or crimp connectors to prevent impedance mismatches.
Ground Shielding: Terminate shields at both ends to minimize ground loops.
Test with VNA: Verify S-parameters (insertion loss, return loss) post-installation.
6. Cost vs. Performance Trade-Offs
Cable Model Cost per Meter Best For
RG316
1.50
–
1.50–3.00 Budget-friendly RF prototyping
RG179
4.00
–
4.00–8.00 High-frequency military systems
Huber+Suhner SFSX-501
20.00
–
20.00–40.00 Lab-grade mmWave precision
Gore PHASEFLEX
50.00
–
50.00–100.00 Mission-critical aerospace/quantum
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