AC4990TXF

AC4990TXF Multi-Constellation Full-Band Precision GNSS Antenna
 

The AC4990TXF features a precision-tuned, twin circular quad-feed, stacked patch element. The signals from the four orthogonal feeds are combined though a feed network, amplified in a wideband LNA, then band-split for narrow filtering in each band and further amplified prior to recombination at the output. The AC4990TXF quad-feed Accutenna® 4 technology enables an excellent axial ratio (strongly mitigating multipath) and a tightly grouped phase centre variation (≤ 2 mm from zenith to 15° above horizon). It is ideal for surveying, autonomous vehicle tracking and guidance, precision agriculture, and other applications where precision matters.

The radio frequency spectrum has become more congested as new LTE bands are activated and their signals or harmonic frequencies [e.g. 800MHz x 2 = 1600MHz (GLONASS-G1)] can affect GNSS antennas and receivers. In North America, planned Ligado signals at 1525 – 1536 MHz can especially impact GNSS antennas that support space-based L-band Corrections (1539 – 1559 MHz). New LTE signals in Europe [Band 32 (1452 – 1496 MHz)] and Japan [Bands 11 and 21 (1476 – 1511 MHz)] have also been observed to interfere with GNSS signals. In addition, Inmarsat satellite communication (uplink: 1626.5 – 1660.5 MHz) can also affect GNSS signals. The new Calian XF antennas have been designed to mitigate out-of- band signals and prevent GNSS antenna saturation. Calian’s custom XF filtering mitigates all existing signals and new Ligado and LTE signals, enabling the antennas and attached GNSS receivers to perform optimally.

The housed AC4990TXF has a rugged through-hole metallic base, and a weatherproof enclosure for permanent installations.

Coverage:

• High-precision GNSS systems
• Marine navigation
• All precision applications, such as:
  • Autonomous vehicle nav. (land, sea, air)
  • Precision agriculture
  • Land survey rover
  • RTK/PPP systems
  • Reference networks