This product comes from Alaris Antennas catalogues

Dual-Polarised Direction Finding Antenna Array


The DF-A0085 dual-polarised fixed site direction finding antenna that covers a frequency range of 20 MHz to 3.6 GHz. The full-size elements on all bands give excellent DF sensitivity. Ultimate angular resolution for strong signals is well under 1° for most of the frequency range. Dipole elements provide good cross-polarisation rejection, and fair performance for signals arriving from up to 15° above or below the horizon The DF-A0085 is capable of HP and VP DF, selectable for Band A and B, with each polarisation requiring characterisation. Two outputs are provided per element in each of bands A and B, one each per polarisation. Band C is polarisation agnostic, allowing concurrent VP, HP and LHCP DF a single characterisation table utilising the array of spiral antennas provided. This DF antenna is designed to be used as a multi-channel phase-sensitive receiver, and correlative algorithm. Characterisation of the antenna can be performed on request. The DF-A0085 provides a weatherproof interface at the top of the antenna onto which a lightning protection system can be mounted.

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Frequency range: Band A Band B Band C 20 - 300 MHz; 300 - 1000 MHz; 1000 - 3600 MHz
Gain See gain graphs
VSWR See VSWR graphs
3 dB Beam width 60 ° (typical on all bands)
Front-to-back ratio (Band C only) 20 dB (typical)
1 st Side lobe level (Band C only) -15 dB (typical)
Cross polarization ratio: Band A Band B Band C 15 dB (typical) 15 dB (typical) 20 dB (typical)
Nominal input impedance 50 O
Max received power 2 W
Antenna type 5-element
Polarisation Vertical
Strong signal DF accuracy < 2° RMS*
Output cables EF400 cables (qty 25)
Connectors SMA male
Cross-sectional wind load area 0.75 m²

    Product Applications

    Signals Intelligence
  • Radio Direction Finding
  • C-ESM

    Design Features

  • Full-size DF Wideband DF Dual-polarised 5-element interferometer MECHANICAL FEATURES: Robust construction Waterproof Fixed site installation Lightning protection interface RELATED PRODUCTS: DF-A0086 Band switch for use with the DF-A0085