SAT-225-400R

SAT-225-400R: Tactical SATCOM Ground Station Helical Antenna

The SAT-225-400R is a high-gain, military-grade Circular Polarized Helical Antenna specifically engineered for the 225–400 MHz UHF SATCOM spectrum. Utilizing Right Hand Circular Polarization (RHCP), this antenna is designed to provide superior signal penetration and link stability for tactical Satellite-On-The-Move (SOTM) and fixed ground station operations. With a potent 12 dBic gain, the SAT-225-400R outperforms larger, conventional Yagi arrays while maintaining a more compact and aerodynamic profile, making it a critical asset for vehicular, shipboard, and ground-shelter deployments.

Design: Advanced Circular Polarization & Tracking

The SAT-225-400R is optimized for mission-critical hubs requiring consistent connectivity with orbital assets, even those low on the horizon.

• High-Gain Helical Technology: Delivers a typical 12 dBic gain, providing superior penetration through atmospheric obstructions and multipath interference compared to linear antennas.
• RHCP Signal Dominance: Uses Right Hand Circular Polarization (RHCP) to virtually eliminate polarization fading and Faraday rotation, ensuring a stable "handshake" with moving tactical satellites.
• Precision Tracking Capability: Supplied with a specialized mounting arrangement that allows for 360-degree Azimuth and 90-degree Elevation steering. This enables precise targeting of both high-angle satellites and low-angle air-to-ground links.
• Scalable Array Formations: For strategic requirements demanding even higher gain, the antenna can be integrated into DUAL-stacked or QUAD-stacked arrays using specialized power splitters and cable harnesses.

Construction: Ruggedized & Weather-Shielded

Built for 24/7 survivability in the world’s most punishing environmental theaters.

• Fiberglass Radome Protection: The internal high-quality copper radiating elements are fully enclosed in a high-strength cylindrical fiberglass radome. This design ensures low wind loading (200 Km/Hr rating) and prevents ice formation from degrading performance.
• Aerospace-Grade Reflector: Features a 500 x 500 mm reflector plate made of 6061T6 aluminum alloy, ensuring a high front-to-back ratio of 20 dB and maximum forward-focused energy.
• Marine-Grade Hardware: All assembly fasteners and tracking hardware are made of stainless steel, providing total immunity to salt fog and acid rain in littoral or naval environments.
• High-Power Capacity: Engineered to handle up to 500 Watts of continuous RF power, supporting high-fidelity secure voice and high-speed tactical data uplinks.

Technical Features

• Unified UHF SATCOM Solution: Precision-tuned for the 225–400 MHz tactical window (optimized bandwidth 240–380 MHz).
• Compact Form Factor: At 1500 mm in length, it is significantly more manageable than Yagi antennas with equivalent gain.
• True Directional Awareness: Symmetric 45-degree beamwidth in both horizontal and vertical planes for simplified satellite acquisition.
• Zero-Switching Architecture: High-angle and low-angle coverage from a single port without requiring diplexers.
• Input Termination: Features a robust N-Female connector for secure, low-loss coaxial integration.

EW, SIGINT & Monitoring Compatibility

• Electronic Support (ES): The 12 dBic gain and directional helical pattern make it an elite tool for intercepting weak or distant satellite downlinks that are often missed by omnidirectional antennas.
• Multipath Immunity: The circular polarization is inherently resistant to signal "ghosting" and interference in urban or littoral environments, ensuring high-fidelity signal discovery.

• Directional Discovery: The symmetric 45-degree beam allows for accurate Line-of-Bearing (LOB) acquisition, essential for emitter location and signal triangulation in the UHF aviation and SATCOM bands.