GeoAstra ANT308 L1, L2 Dual band RTK High-Precision Active Helical Antenna

The GeoAstra ANT308 is a state-of-the-art multi-frequency active helical antenna designed to deliver high precision and reliability for GNSS applications. Incorporating advanced multi-arm spiral technology, this antenna supports dual-band satellite signal reception (L1 and L2) from GPS, GLONASS, Beidou, and Galileo systems. It is tailored to meet the demands of modern multi-system compatibility and high-precision requirements, making it an ideal choice for handheld GNSS positioning equipment, UAVs, navigation, and other high-accuracy GNSS receiver applications.

Features

• Multi-Arm Spiral Technology: Ensures right-handed circular polarization and stable phase center performance, reducing measurement errors.

• High Gain and Minimal Gain Roll-Off: Provides excellent reception for low elevation satellite signals, increasing the number of available satellites and enhancing positioning accuracy.

• Ingenious Low Noise, High Gain Amplification: Built-in low noise amplifier (LNA) with pre-filtering technology effectively suppresses out-of-band interference signals, ensuring high signal quality and system reliability.

• Compact and Lightweight Design: Small size and light weight make the antenna easy to carry and install, ideal for portable and field applications.

• Durable and Reliable: IP67-rated enclosure ensures the antenna is dust-tight and water-resistant, suitable for long-term field operations.

Technical Specifications:

Signal Received

• GPS: L1/L2

• GLONASS: L1/L2

• Galileo: E1/E5b

• BEIDOU: B1/B2

• QZSS: L1

• SBAS: L1

Nominal Impedance

• 50Ω

Polarization

• RHCP (Right-Hand Circular Polarization)

Axial Ratio

• ≤1.5 dB

Azimuth Coverage

• 360°

Working Frequency

• 1197-1278 MHz

• 1559-1606 MHz

LNA Feature

• LNA Gain: 35 ± 3 dB (Typ. @ 25°C)

• Noise Figure: ≤ 1.5 dB (@ 25°C, Typ.)

• Output/Input VSWR: ≤ 1.8:1 typ., 2.0:1 max

• Operation Voltage: 3.0 ~ 16 VDC

• Operation Current: < 45 mA

Mechanicals & Environmental

• Dimensions: 27.8 mm * 56 mm

• Weight: 18 g

• Connector: SMA-J

• Operating Temperature: -40°C to +85°C

• Storage Temperature: -40°C to +85°C

• Humidity: 95% non-condensing

Dimensions (mm):