The HFL-137/50 micro coaxial cable is an ultra-fine, high-performance 50 Ohm RF cable specifically designed for low-loss signal transmission in compact electronic devices. Featuring an outer diameter of just 1.37mm, this flexible micro coaxial wire is constructed with a 7/0.102mm stranded conductor—available in Tinned Copper (TT) or Silver-Plated Copper (ST)—and premium Fluorinated Ethylene Propylene (FEP) insulation for exceptional thermal stability and signal integrity up to 6 GHz.
Engineered with a dense tinned copper braid shield offering 90% coverage, the HFL-137/50 guarantees superior EMI suppression and low attenuation across high-frequency bands. Whether integrated into Wi-Fi 6E/7 antennas, IoT gateway modules, drone telemetry systems, or medical electronics, HiFlexlink ensures consistent impedance control (50 ± 2 Ohm) and long-term durability (-55℃ to +125℃). In addition to bulk cable supply, HiFlexlink provides fully customized RF micro coaxial cable assemblies fitted with IPEX, MHF, or Hirose U.FL connectors tailored to your exact mechanical and electrical requirements.
HFL-137/50 Micro Coaxial Cable (1.37mm OD)
Low-loss 1.37mm outer diameter micro coaxial RF cable. Available in both Tinned Copper (TT) and Silver-Plated Copper (ST) inner conductors (7/0.102mm) for flexible antenna lead-in wiring up to 6GHz.
Ultra-Compact 1.37mm OD: Minimal footprint and outstanding flexibility for high-density, space-constrained RF layout.
Dual Conductor Options: Available in Tinned Copper (TT) and Silver-Plated Copper (ST) core (7/0.102mm) for flexible cost/performance optimization.
High Shielding Efficiency: Tinned copper braid shield with 90% coverage effectively prevents EMI/RFI interference.
Stable 50 Ohm Impedance: Precision 50 ± 2 Ohm impedance with low VSWR ≤ 1.3 for 0–6 GHz wireless transmission.
Durable FEP Dielectric & Jacket: Excellent chemical resistance, mechanical durability, and broad operating range (-55℃ to +125℃).
IPEX / U.FL Compatible: Ideal for crimping and automated assembly with standard micro RF connectors and PCB antennas.
Technical Specifications & Construction
1. Product Construction & Parameters
| Structure Item | Material & Construction | Outer Diameter (OD) | Coverage / Color |
|---|---|---|---|
| ① Inner Conductor | Tinned Copper (TT) or Silver-Plated Copper (ST) (7/0.102 mm) | 0.306 ± 0.02 mm | – |
| ② Insulation | FEP | 0.91 ± 0.03 mm | Clarity |
| ③ Outer Conductor | Tinned copper wire braid (16/5/0.05 mm) | 1.13 ± 0.05 mm | 90 ± 5% Coverage |
| ④ Jacket | FEP | 1.37 ± 0.05 mm | Multiple Colors Available |
2. Electrical & Mechanical Characteristics
| Electrical Properties | |
|---|---|
| Impedance (@1ns) | 50 ± 2 Ω |
| Capacitance | 98 ± 4 pF/m |
| Velocity of Propagation | 70 ± 2 % |
| VSWR (0 ~ 3GHz/6GHz) | ≤ 1.3 |
| Rating Voltage | 30 V |
| Attenuation (@ 20℃, dB/m) | |
|---|---|
| 1 GHz / 2 GHz | ≤ 1.80 (TT) / ≤ 1.70 (ST) dB/m |
| 3 GHz / 4 GHz | ≤ 3.20 / ≤ 3.70 dB/m |
| 5 GHz / 6 GHz | ≤ 4.20 / ≤ 4.80 dB/m |
Environmental & Packaging Specs
- Operating Temperature Range: -55℃ to +125℃
- Min. Static Bending Radius: 4 mm
- Optimal Preservation Period: 2 Months
Key Features
- Precision 50 Ohm Impedance Control: 50 ± 2 Ohm impedance with 70% velocity of propagation for stable signal flow.
- High-Density Braid Shielding: 16/5/0.05mm tinned copper braid (90 ± 5% coverage) for strong EMI protection.
- Dual Conductor Options: Choose Silver-Plated Copper (ST) for lower attenuation (≤ 1.70 dB/m @ 2 GHz) or Tinned Copper (TT) for cost-efficient assembly.
- Wide Thermal Operating Range: High-grade FEP jacket rated for extreme conditions from -55℃ to +125℃.
- Micro Outer Diameter (1.37mm): Tight 4mm bending radius allows effortless routing inside micro electronic enclosures.
Target Applications
Wireless & IoT Infrastructure: Wi-Fi 6E/7 routers, Bluetooth modules, 5G NR micro-antennas, and IoT hubs.
Unmanned Systems & Aerospace: Drone RF control boards, lightweight telemetry links, and portable avionics.
Medical & Bio-Tech Equipment: Portable diagnostic monitors, endoscopic camera links, and sensor probe wiring.
Consumer Electronics: Laptops, gaming consoles, smart home devices, and PCB board-to-antenna internal jumpers.
Custom RF Cable Assemblies: Factory-assembled jumper cables with IPEX MHF, Hirose U.FL, or SMA connectors.
Frequently Asked Questions about HFL-137/50
What is the main difference between TT and ST conductors in HFL-137/50?
TT uses Tinned Copper conductors, offering cost-effectiveness and good solderability. ST uses Silver-Plated Copper conductors, which provide lower attenuation at higher frequencies (e.g., ≤ 1.70 dB/m at 2 GHz for ST vs ≤ 1.80 dB/m for TT) and improved signal velocity.
What micro RF connectors work best with the 1.37mm HFL-137/50 coaxial cable?
With its 1.37mm outer diameter, HFL-137/50 is perfectly matched for standard micro coax connectors including IPEX MHF I, Hirose U.FL, IPEX MHF4, and mini SMA crimp connectors.
How flexible is the HFL-137/50 cable for tight internal enclosures?
HFL-137/50 features a stranded inner conductor (7/0.102mm) and a flexible FEP jacket, allowing a minimum static bending radius of just 4mm for smooth installation in space-constrained hardware.
Can HiFlexlink customize the impedance, shielding, or jacket color for HFL-137/50?
Yes. HiFlexlink offers full OEM/ODM customization. We can adjust conductor materials, impedance (50 Ohm, 75 Ohm, or custom), shield coverage, jacket colors, and deliver complete pre-terminated cable assemblies.
Need to Custom a RF Coaxial Cable
Need tailored specs for your specific wireless module? HiFlexlink supports complete micro coaxial cable customization: