GPS/GNSS Antennas

Multi-GNSS Timing Antennas Model AU-500/AU-300 NEW


AU-500 dual band antenna for high robustness and AU-300 single band antenna for excellent cost performance

- Single and dual-band antennas (L1/L5)
- Support for global and regional satellite systems
- High gain, low noise
- Ideal for time synchronisation applications
- Superior out of band filtering
- Built-in lightning protection – compliant to IEC 61000-4-5
- IP67, CE, FCC & RoHS 2 compliant



  • Supporting worldwide GNSS (L1 and L5 bands) *L5 band is available only for AU-500.

    These antennas are designed to enable GNSS receivers to perform at their full potential even under harsh environments such as weather and interference. They provide safety and security for critical infrastructure systems such as 5G mobile base stations, TV broadcasting, PTP grand master clocks, power grids and various types of business radio systems, where service outages are not tolerated. AU-500 is a dual-band antenna supporting L1 and L5, while AU-300 is a single-band antenna supporting only L1.

    Model Supported Satellite Constellations
    L5 band
    GPS, Galileo, BeiDou, QZSS, NavIC
    L1 band
    GPS, Galileo, GLONASS, BeiDou, QZSS, SBAS*
    AU-300 -
  • Integrated ground plane and harsh environment protection

    The built-in gound plane improves sensitivity and reduces the effects of interference and multipath. They are also equipped with a high-quality polymer radome that prevents snow accumulation, is waterproof and dustproof in compliance with IP67. Quality tests simulating harsh environments have verified the antenna's long-term protection against rain, snow, sea water, ultraviolet rays, chemicals, and gases.
  • Superior Out of Band Filtering

    A built-in noise filter effectively eliminates interference in the vicinity of 1.5 GHz caused by 4G/LTE mobile base stations as well as other radio waves (satellite communications, etc.) that can adversely affect GNSS reception.
  • Built-in Lightning protection

    Lightning protection compliant with IEC61000-4-5 protects the antenna from lightning surges.
  • High water resistance

    The antenna structure has been designed with superior water resistance to minimise field problems due to heavy rain and flooding.
  • Standard TNC Connection

  • Highest robustness in combination with Furuno's GNSS receivers GT-100/9001/90/88 & GF880x series

    AU-500 and AU-300 achieve their best performance when combined with Furuno's GNSS receivers (GT-100/9001/90/88 & GF-880x series). Time accuracy and robustness, required for critical infrastructure, can be achieved by the Furuno receivers themselves, such as dual-band reception, multipath mitigation using Dynamic Satellite Selection™*, and anti-jamming function, but are further enhanced when combined with Furuno's high-performance antennas

    * Multipath mitigation technology based on an algorithm developed by NTT

    Timing Multi-GNSS Receiver Module GT-100/GT-9001/GT-90

  • Easy installation when used with Furuno's Antenna Mounting Kit AFB-01

    The AFB-01 ensures correct installation of the GNSS antenna to prevent poor reception and enable the GNSS receiver to perform as it should.

    AFB-01 Antenna Mounting Kit for AU-500/AU-300

  • Coaxial lightning arrestor to protect GNSS receiver from lightning surges (optional)

    In environments which demand continuous operation such as critical infrastructure, the optional coaxial lightning arrestor protects not only the antenna itself but also the GNSS receiver from lightning surges. TVA-03C/TVA-03V are designed for both direct and induced lightning surges, and provide the highest lightning surge protection performance by proper grounding.

    Coaxial lightning arrestor(TVA-03C/TVA-03V)

    Please refer to the document "How to install a surge protective device to enhance lightning surge resistance (with examples and test results)."

    Surge Protection Device Test Report



Constellations Supported
L1: GPS L1C/A, GLONASS L1OF, Galileo E1B/E1C,BeiDou B1I /B1C, QZSS L1C/A, SBAS L1C/A
L5 (AU-500 only): GPS L5, Galileo E5a, BeiDou B2a, QZSS L5, NavIC L5
Input Frequency
L1: 1558 to 1606MHz
L5 (AU-500 only): 1164 to 1189MHz
Right Handed Circular Polarisation (RHCP)
Antenna Gain
>= 4dBi (Peak gain)
>= 2dBi (In-band)
Output Impedance
50 Ω
Pre. Amp Gain
40dB ± 3dB
Pre. Amp Noise Figure
<= 2.5dB
Out of Band Rejection
fo= 1176.5MHz (AU-500 only), 1582MHz
fo ±50 MHz: <= -50 dB, fo ±100MHz: <= -70dB
<= 2.0 (@LNA output)
Supply Voltage
DC 2.5 – 12V
Power Consumption
AU-500: <= 35 mA
AU-300: <= 15 mA
Operating Temperature
-40°C to +85°C
Storage Temperature
-40°C to +85°C
Operating Relative Humidity
20 to 90% RH
Water Resistant
Shock resistence (lightning)
±4kV, IEC 61000-4-5
Outer Size
Diameter 112.5mm x Height 104.8mm
AU-500: 340 ± 17g
AU-300: 220 ± 13g
Connector Type


Three essential points when installing a GNSS antenna

When installing a GNSS antenna, components such as the coaxial cables and amplifiers should be selected to satisfy the antenna specifications of the GNSS receiver. It is also necessary to consider the propagation delay between the antenna and the receiver.  

In the following document, we explain how to calculate the required specification values with concrete examples from the viewpoint of a GNSS receiver manufacturers.

  • Total gain
  • Total NF
  • ropagation delay in coaxial cables

It is especially useful for those who are new to GNSS receivers. We have prepared an Excel tool for calculating "Total Gain" and "Total NF" due to their complex formulas.

Please fill in the form to download the document and calculation tool.

Download form

Quote Request

Please fill out the quote form and our staffs will respond to you shortly.

This is a quote form only for GNSS receivers for time synchronization.
For other contents, please contact us using the respective inquiry form.

Quote request form

Documents, Software

Download documents and software related to this product and other GPS/GNSS products (Specifications document, Drivers and Monitor software).

Download contents for AU-500/AU-300

  • GNSS Antenna Hardware Specifications
  • GNSS Antenna Installation Procedure
  • GNSS Antenna Installation Appendix
    - Three essential points when installing a GNSS antenna -
  • Hardware Specifications (Surge Protective Device)
  • Surge Protection Device Test Report

Download page


* Specifications subject to change without notice.