AC4990SXF

Overview

The AC4990SXF is a high-performance, precision-tuned GNSS antenna featuring Accutenna® 4 technology for exceptional accuracy and reliability. It supports a full range of constellations and signals, including:

• GPS/QZSS: L1, L2, L5, QZSS-L6
• GLONASS: G1, G2, G3
• Galileo: E1, E5a, E5b, E6
• BeiDou: B1, B2, B2a, B3
• NavIC: L5
• SBAS: WAAS (North America), EGNOS (Europe), MSAS (Japan), GAGAN (India)
• L-band Corrections

Advanced Design for Superior Performance

The AC4990SXF incorporates a precision-tuned, twin circular quad-feed stacked patch element. Signals from four orthogonal feeds are combined through a feed network, amplified via a wideband LNA, then split for narrow filtering in each band before final recombination at the output.

This advanced architecture delivers:

• Excellent axial ratio for strong multipath mitigation
• Tightly grouped phase center variation (≤ 2 mm from zenith to 15° above horizon)

Ideal for applications where precision is critical, such as:

• Surveying
• Autonomous vehicle tracking and guidance
• Precision agriculture
• High-accuracy industrial solutions

Engineered for Interference Mitigation

As the RF spectrum becomes increasingly congested with new LTE bands and planned signals like Ligado (1525–1536 MHz), GNSS antennas face potential interference. The AC4990SXF is designed to counter these challenges:

• Custom XF filtering mitigates out-of-band signals, including LTE and Ligado, preventing antenna saturation
• Protects against interference from sources such as:
  • LTE Bands in Europe (Band 32: 1452–1496 MHz) and Japan (Bands 11 & 21: 1476–1511 MHz)
  • Inmarsat uplink (1626.5–1660.5 MHz)

This ensures optimal performance for GNSS antennas and connected receivers, even in demanding environments.

Rugged and Versatile

The AC4990SXF is built for durability and flexibility:

• Surface-mount metallic base with four screw holes
• Supports mounting via screws, magnets, or adhesive tape
• Weatherproof enclosure for permanent outdoor installations