GPS World

Tag: dual-band antenna

  • Tallysman adds housed TW3885T dual-band timing antenna

    Tallysman adds housed TW3885T dual-band timing antenna

    Photo: Tallysman
    Photo: Tallysman

    Tallysman Wireless has added the housed TW3885T dual-band (L1/L5) Accutenna technology timing antenna to its line of GNSS products.

    The dual-band TW3885T antenna supports

    • GPS/QZSS L1/L5
    • Galileo E1/ E5a/b
    • BeiDou B1/B2/B2a
    • GLONASS G1/G3
    • Satellite-based augmentation systems (SBAS) in the region of operation: WAAS (North America), EGNOS (Europe), MSAS (Japan) or GAGAN (India).

    Historically, dual-band antennas and receivers commonly supported GPS L1 and L2 and GLONASS G1 and G2. In recent years, GPS, GLONASS, Galileo, BeiDou and NavIC have added GNSS signals in the L5 frequency band (1164-1217 MHz). As a result, the new dual-band GNSS standard has become L1 and L5. Tallysman’s new TW3885T antenna has been tuned to provide optimal support for both the upper (L1/ G1/E1/B1/) and lower (L5/G3/E5/B2) GNSS bands.

    The TW3885T is housed in a through-hole mount, weatherproof (IP69K) enclosure. For permanent installations, L-bracket (PN 23-0040-0) or pipe (23-0065-0) mounts are available. Tallysman provides an antenna installation guide that recommends a 100-125 mm ground plane and provides antenna installation and cable connector waterproofing best practices.

    The radio frequency spectrum has become congested worldwide as many new LTE bands have been activated, and their signals or harmonic frequencies can affect GNSS antennas and receivers. In North America, the planned Ligado service, which will broadcast in the frequency range of 1526 to 1536 MHz, can affect GNSS signals. New LTE signals in Europe (band 32, 1452–1496 MHz) and Japan (bands 11 and 21, 1476–1511 MHz) have also affected GNSS signals. Tallyman’s new TW3885T mitigates the effects of these new signals.

  • Allystar offers GNSS antenna for high-precision positioning

    Allystar offers GNSS antenna for high-precision positioning

    The AGR6302/6303 antenna. (Photo : Allystar)
    The AGR6302/6303 antenna. (Photo : Allystar)

    Allystar Technology Co. Ltd., headquartered in Shenzhen, China, is offering new patch antennas: the AGR6302 and AGR6303. Both GNSS antenna models are designed for precision dual-frequency positioning.

    AGR6302 is capable of receiving L1/L2 bands, and AGR6303 is capable of receiving L1/L5 bands. They are designed for UAVs, precision agriculture, autonomous vehicles and other applications where precision matters.

    The AGR6302/AGR6303 active antenna is designed by unique technology to cover GPS, BDS, Galileo, GLONASS, IRNSS and the QZSS system (see table).

    Table: Allystar
    Table: Allystar

    The antenna features stable signal quality at low cost. It employs a stack four-feeds antenna architecture with hybrid to achieve the multi-band operation, lower axial ratio, wider half-power beamwidth and excellent right-hand circular polarization, the company said.

    Antenna size. (Image: Allystar)
    Antenna size. (Image: Allystar)

    With its new architecture, the active part has two stages. It has two level low noise amplifiers (LNAs) —one for the lower bands, the other for the higher bands. Then, the combiner and the third-level LNA output the RF gain to receiver. With this architecture, the antenna provides an excellent noise figure/RF linear and LNA gain, and out-band rejection, resulting in good signal-to-noise ratio and anti-interference.

    It is housed in a compact, industrial-grade waterproof and magnet mount enclosure. Using internal magnets, the antenna can be installed almost anywhere, allowing for greater flexibility.