Leaky Cable Solution and Products

Leaky feeder solution is a type of radiating coaxial cable that transmits signals within specific frequency bands, providing continuous, stable, and controllable wireless coverage, especially suitable for confined or complex linear structures like tunnels and subways.

Industry Overview

Leaky Cable Solution

It is a systematic technology that uses specialized cables, which “leak” signals like an antenna, to achieve continuous and uniform wireless coverage inside tunnels.

Industry Challenges

Bandwidth Limitation

Conventional 1-5/8" leaky coaxial cables support frequencies only up to 2.7 GHz and cannot accommodate higher 5G bands like 3.5 GHz, limiting multi-operator co-cable upgrade and expansion.

4.9GHz Coverage In Tunnel

The 4.9 GHz band suffers fast signal attenuation. Complex metro tunnels with obstacles and metal reflections raise higher requirements for radio coverage systems.

Ultra-Wideband Design & Construction

For leaky coaxial cables working in ultra-wide bands, coupling and transmission losses vary sharply across frequencies. Inconsistent radiation patterns between low and high frequencies cause uneven coverage. Coupled with cutoff frequency limitations, wideband design and field construction remain challenging.

Our Solution

LCX Solution for Metro Tunnels

It supports 2/3/4/5G signal coverage for all major telecom operators, as well as private networks including TETRA, GSM-R, 5G-R, LTE-M and LTE-U.

LCX Solution for High-speed Railways

Adopting wideband leaky coaxial cables to support multi-system co-deployment of 2G/4G/5G, it delivers continuous and uniform signal radiation along tunnels, resists wind pressure and vibration, and ensures stable communications for high-speed mobile scenarios of high-speed railways.

LCX Solution for Indoor Building Coverage

As the industry innovator of the 170° ROOMTOP indoor distributed leaky coaxial cable solution, ZTT is the sole strategic partner of China Tower Group for indoor distributed leaky cable deployment. This system delivers advantages including straightforward installation, homogeneous signal coverage and lower capital expenditure.

MIMO 5G leaky cable

This is a technical solution characterized by uniform signal coverage with no blind spots, inherent full-band compatibility, and a stable, high-quality transmission rate.

Cross-Polarized Leaky Cable

The product achieves breakthrough performance at the physical layer by applying high-purity polarization and multi-stream isolation technology. Its core lies in utilizing a design with high polarization purity and a high cross-polarization ratio to precisely control the polarization state of electromagnetic waves. This effectively separates multiple data streams over the air interface, increasing data transmission rates by 21% to 75% across different frequency bands.

AL-Leaky Cable

It greatly reduces the project procurement cost compared with traditional copper leaky cables, while maintaining electrical performance, mechanical protection and construction convenience.

Value Contained

Creating a Zero-Blind-Spot, Highly Reliable Converged Communication Network

By leveraging the linear continuous radiation characteristics of leaky feeder cables, this solution achieves seamless, stable multi-band signal coverage in traditionally challenging areas such as tunnels and mines. A single cable can simultaneously support public networks, private networks, and IoT signals, fundamentally eliminating the need for redundant multi-system deployments. It provides a "signal lifeline" for critical operations like train dispatching and emergency communications, significantly enhancing network security and operational reliability.

Reducing Lifecycle Costs and Engineering Complexity

In long-distance linear scenarios, the leaky feeder solution offers substantial savings in equipment, installation, and long-term maintenance costs compared to distributed antenna systems. Its "deploy once, evolve forever" feature minimizes the frequency and difficulty of future renovations. The system can flexibly support future communication bands through upgrades at both ends, helping customers achieve optimal total cost of ownership and a sustainable network evolution path.

Enabling Operational Intelligence and User Experience Enhancement

Stable and continuous wireless coverage provides the foundational support for digital applications such as train-to-ground communication, smart sensing, and high-precision positioning. While ensuring safe dispatching and efficient management, it directly improves the communication experience for passengers and staff in enclosed spaces. This solution builds an expandable IoT platform for smart rail transit, intelligent mining, and similar scenarios, creating long-term value across safety, efficiency, and service dimensions.

Successful Cases

First National Application of Extended-Frequency 13/8" Cables for Shenyang-Baihe HSR, Delivery Completed

Traditional 1-5/8″ leaky coaxial cables are limited to a maximum operating frequency of 2.7 GHz, failing to support high-frequency 5G bands such as 3.5 GHz. This constraint restricts multi-operator shared cable deployment and subsequent network expansion. This solution enables multi-carrier co-cable transmission, simplifies tunnel communication infrastructure, reduces engineering investment, and reserves sufficient bandwidth capacity for future network upgrades along the HSR line.

China’s First Field Test of New 4.9GHz Leaky Cable Completed on Zhengzhou Metro Line 1

The 4.9 GHz band suffers fast signal attenuation, while tunnel obstacles and metal reflections bring tough coverage challenges. ZTT’s solution aims to break through these radio propagation limits, achieving steady 4.9GHz coverage for metro 5G, multi-operator co-use and lower infrastructure costs.

5G Full Multi-band Coverage on the Shanghai-Suzhou-Nantong Rail-cum-Road Bridge

Ultra-wideband leaky coaxial cables face drastic frequency-dependent coupling and transmission loss. Mismatched radiation patterns across low and high bands create patchy coverage, plus cutoff frequency restrictions complicate wideband design and site rollout. ZTT’s solution seeks to break these wideband bottlenecks, delivering consistent full-band radiation, seamless multi-band coverage and streamlined bridge construction.