Ultra-wideband tunnel antenna delivering stable industrial connectivity

The HELI-31 is a compact, left hand polarised antenna engineered for harsh underground environments where stable, wideband connectivity is essential. Designed for mining, tunnelling, and heavy-industry operations, it delivers high-performance coverage from 1700 to 7200 MHz, ensuring reliable telemetry, M2M communication, automation, and Wi-Fi/LTE/5G propagation even in challenging non-line-of-sight scenarios. Its rugged construction and ability to maintain signal integrity around tunnel bends make it exceptionally effective for demanding underground deployments.

Key Features

• Ultra-wideband frequency support: Operates from 1700–7200 MHz to support Wi-Fi 6, LTE, 4G and 5G communication systems across industrial and underground networks.
• High-gain left circular polarisation: Delivers 9.5 dBic peak gain, improving signal stability, reducing reflections and enhancing RF performance in tunnel environments.
• Uni-directional radiation profile: Radiates forward along the tunnel path, optimised for controlled coverage and predictable propagation.
• Reliable in tunnel and mining conditions: Maintains connectivity around bends and in areas obstructed by machinery, geological structures and moving vehicles.
• MIMO-optimised configuration: Available in Left-Hand Circular (LHC) and Right-Hand Circular (RHC) variants to improve decorrelation and boost MIMO system performance.
• Rugged industrial radome: Built from ABS and PVC materials for impact resistance, UV protection and long-term reliability in harsh underground environments.
• Ingress protection for severe conditions: Features IP65 protection against dust and water, ensuring stable operation in wet and contaminated tunnel environments.
• Wide operating temperature range: Performs reliably from –40 °C to +70 °C, suitable for extreme underground heat or cold airflow conditions.
• Factory-mounted cable and connector: Equipped with a 600 mm RG-58 coaxial cable and N-Type (Male) connector for secure system integration.
• Flexible mounting compatibility: Supports ceiling-mount and tunnel-roof mounting using optional brackets for various tunnel geometries and installation requirements.
• Enhanced continuity for underground networks: Ensures stable connectivity for telemetry, automation, IoT devices, personnel communication systems and underground data networks.

Engineered for the demanding nature of mining and tunnel environments, this antenna improves communication reliability, enhances RF stability and ensures strong propagation in complex underground conditions.