The HFL-137L-S1 micro coaxial cable is an ultra-fine, high-performance 50 Ohm RF coaxial cable designed to deliver low-loss signal transmission in compact electronic assemblies. Featuring an outer diameter of just 1.37mm, this miniature RF cable utilizes a silver-plated copper stranded conductor (7/0.105mm) and high-grade Fluorinated Ethylene Propylene (FEP) insulation, ensuring exceptional electrical stability across high frequencies up to 10 GHz.
Engineered with a dual-shielding architecture—combining 100% composite tape coverage and a 90% tinned copper braid—the HFL-137L-S1 guarantees maximum EMI/RFI suppression for sensitive high-density interconnects. Whether integrated into Wi-Fi 6E/7 modules, drone RF systems, wearable medical devices, or handheld test equipment, HiFlexlink provides consistent impedance control (50 ± 2 Ohm) and ultra-low attenuation. Optimized for demanding wireless infrastructure and internal board-to-antenna connections, HiFlexlink also offers fully customized RF cable assemblies tailored to your specific mechanical and electrical specifications.
HFL-137L-S1 Micro Coaxial Cable (50Ω)
1.37mm OD high-frequency micro RF coaxial cable featuring silver-plated copper conductor (7/0.105mm), double shielding, and FEP insulation/jacket. Tested for ultra-low loss up to 10GHz.
Ultra-Compact Profile: 1.37mm outer diameter with high flexibility, ideal for space-constrained RF assemblies.
Double-Shielded Protection: Composite tape (100% coverage) + tinned copper braid (90% coverage) for high isolation & minimal EMI.
Extended High-Frequency Performance: Tested up to 10 GHz with stable 50 Ohm impedance and VSWR ≤ 1.3 (0–6 GHz).
Premium Fluoropolymer Insulation: FEP dielectric and jacket offer high chemical resistance and thermal stability.
Low Attenuation Rate: Superior signal integrity with low loss rates (≤ 3.70 dB/m @ 6 GHz; ≤ 5.09 dB/m @ 10 GHz).
Custom OEM/ODM Options: Available with IPEX/MHF connectors, customized lengths, and tailored impedance options.
Technical Specifications & Construction
1. Product Construction & Parameters
| Structure Item | Material & Construction | Outer Diameter (OD) | Coverage / Color |
|---|---|---|---|
| ① Inner Conductor | Silver-plated copper wire (7/0.105 mm) | 0.315 ± 0.02 mm | – |
| ② Insulation | FEP | 0.925 ± 0.05 mm | Clarity |
| ③ Outer Conductor 1 | Cu-plastic composite tape | 0.95 ± 0.03 mm | 100% Coverage |
| ④ Outer Conductor 2 | Tinned copper wire braid | 1.15 ± 0.05 mm | 90 ± 5% Coverage |
| ⑤ Jacket | FEP | 1.37 ± 0.05 mm | Multiple Colors Available |
2. Electrical Characteristics
| Electrical Properties | |
|---|---|
| Impedance (@1ns) | 50 ± 2 Ω |
| Capacitance | 98 ± 4 pF/m |
| Velocity of Propagation | 70 ± 2 % |
| VSWR (0 ~ 6GHz) | ≤ 1.3 |
| Rating Voltage | 30 V |
| Operating Frequency | 6 GHz (Tested to 10GHz) |
| Attenuation (@ 20℃, dB/m) | |
|---|---|
| 1GHz / 3GHz / 6GHz | ≤1.60 / ≤2.60 / ≤3.70 dB/m |
| 8GHz / 10GHz | ≤ 4.41 / ≤ 5.09 dB/m |
Key Features
- Precision 50 Ohm Impedance Control: 50 ± 2 Ohm with 70% velocity of propagation for fast, low-reflection signal flow.
- Dual-Layer Shielding: Aluminum-plastic tape (100%) plus tinned copper braid (90 ± 5%) for superior shielding effectiveness.
- Durable FEP Construction: Provides superior heat resistance, flexibility, and resistance to environmental degradation.
- High-Frequency Range: Optimized for standard 0–6 GHz operations and field-tested up to 10 GHz.
- Fine Stranded Conductor: Silver-plated copper wire design (28 AWG equivalent core) for improved flex-life and solderability.
Target Applications
Wireless & IoT Communications: Wi-Fi 6E/7, Bluetooth, 5G NR micro-antennas, and IoT gateway modules.
Compact Aerospace & Defense: Unmanned Aerial Vehicles (UAVs), telemetry systems, and lightweight avionics.
Medical & Healthcare Devices: Endoscopic cameras, wearable patient monitors, and high-frequency diagnostic devices.
Consumer & Industrial Electronics: Laptops, handheld gaming consoles, smart home hubs, and PCB board-to-board RF interconnects.
Custom RF Cable Assemblies: Micro-coaxial jumper cables fitted with IPEX / U.FL / MHF connectors.
Frequently Asked Questions about HFL-137L-S1
How does the HFL-137L-S1 (1.37mm) compare to standard RG178 coaxial cables?
While standard RG178 cables have a larger diameter (around 1.8mm) and higher attenuation at high frequencies, HFL-137L-S1 offers a significantly smaller 1.37mm outer diameter with superior double shielding (composite tape + braid). This makes HFL-137L-S1 more suitable for space-constrained, high-density 5–10 GHz wireless modules.
What connectors are compatible with the HFL-137L-S1 micro coaxial cable?
The 1.37mm outer diameter makes HFL-137L-S1 fully compatible with industry-standard micro RF connectors such as IPEX MHF I, IPEX MHF III/IV, Hirose U.FL, and mini SMA/SSMB crimp connectors. HiFlexlink can supply pre-terminated cable assemblies according to your layout requirements.
Can HiFlexlink customize the impedance or shielding structure of the HFL-137L-S1?
Yes. HiFlexlink specializes in custom RF wire manufacturing. We can tailor conductor materials (e.g., bare copper, silver-plated copper), dielectric thickness, jacket color, capacitance, and impedance (50 Ohm or custom) to match your application environment.
What is the maximum operating frequency and attenuation of HFL-137L-S1?
HFL-137L-S1 is rated for optimal performance up to 6 GHz (VSWR ≤ 1.3) and is tested up to 10 GHz. Attenuation is kept low at ≤ 3.70 dB/m at 6 GHz and ≤ 5.09 dB/m at 10 GHz.