Brief Answer
A leaky feeder cable, also known as a leaky feeder, is a special coaxial cable that radiates and receives radio energy along its length in a controlled manner. It is used when normal antennas cannot evenly supply a long, underground, or twisted structure. Typical applications include tunnels, underground garages, mines, industrial facilities, long corridors, and technical buildings.
Leaky feeder cables function like an elongated antenna. This allows for more uniform radio coverage along challenging routes.
How does a leaky feeder cable work?
The cable has defined radiating properties. It transports the radio signal and couples it out along the route in a controlled manner. At the same time, it can receive signals from radio devices along the route.
Typical Locations of Use
- Road and rail tunnels.
- Underground garages and basements.
- Long corridors and technical passages.
- Industrial facilities with much concrete and metal.
- Buildings with challenging antenna placement.
What Matters in Planning
| Topic | Why is it important? |
|---|---|
| Cable length | Loss and radiation must be calculated. |
| Frequency band | The cable must match the system. |
| Power feed | Repeaters, couplers, and levels must be correct. |
| Fire protection | Cable routes and materials are relevant. |
| Measurement | Only measurement reveals the actual coverage. |
FAQ
Is a leaky feeder cable an antenna?
It functions like a distributed antenna along a route.
When is a leaky feeder cable needed?
Especially in tunnels, underground garages, long corridors, and challenging indoor areas.
Can leaky feeder cables be easily installed?
No. Frequency, attenuation, power feed, fire protection, and measurement must be planned.
Is a leaky feeder cable better than individual antennas?
Not always. It is effective in long or underground structures, but not necessary for every building situation.
Sources and Current Status
This page was created on July 6, 2026. Technical and regulatory information must be cross-referenced with the latest manufacturer data, standards, frequency specifications, and site conditions for specific projects.