Description
The 3/8″ radiating cable is a versatile “middle-ground” solution, providing significantly higher flexibility than larger 7/8″ or 1-1/4″ cables while offering better power handling and lower attenuation than 1/4″ variants. This cable uses a physically foamed Polyethylene (PE) dielectric and a slotted copper foil or corrugated copper outer conductor to create a consistent radiation pattern.
In environments like underground railways or mines, these cables eliminate the “dead zones” typical of point-source antennas. They are almost always jacketed in Low Smoke Zero Halogen (LSZH) or fire-retardant materials to meet safety standards for public and underground infrastructure. The slots are engineered to provide a specific coupling loss (the ratio between power inside the cable and power received by a mobile unit nearby), ensuring stable communication for emergency services and private networks alike.
Key Technical Advantages
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Compact and Flexible: With a minimum single-bend radius of ~40mm, it is easily routed through tight curves and complex architectural layouts.
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Wideband Capability: Efficiently supports a vast range of frequencies, from 150 MHz to over 6 GHz, covering public safety, cellular, and Wi-Fi bands.
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Uniform Field Strength: Prevents signal spikes and drops, providing a steady “cylindrical” coverage zone that follows the cable path.
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Passive Reliability: As a passive component, it requires no power supply along its length, making it highly durable and low-maintenance in harsh industrial or underground conditions.
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Low Passive Intermodulation (PIM): High-quality construction ensures clean voice and data communication even in multi-channel systems.
Key Features
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Impedance: 50 Ohm (±2 Ohm).
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Outer Diameter (Jacket): ~11.2mm.
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Outer Conductor: Slotted Copper Foil or Corrugated Copper.
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Center Conductor: Copper-Clad Aluminum (CCA) or Solid Copper.
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Fire Safety: LSZH / Flame-Retardant Jacket (Standard).
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Applications: Mining, Subway Tunnels, Stairwells, and Aircraft Fuselages.
Technical Summary
| Parameter | Specification (Typical 3/8″) |
| Impedance | 50 Ohm |
| Velocity of Propagation | 85% – 88% |
| Coupling Loss (95%, 2m) | ~70 – 80 dB |
| Attenuation (@ 900 MHz) | ~9.8 dB / 100m |
| Cut-off Frequency | 13.5 GHz |
| Weight | ~0.12 – 0.15 kg/m |
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