This product comes from Alaris Antennas catalogues

Cavity Backed Spiral Antenna


SPRL-A0027 is a wideband left-hand/right-hand circularly polarised cavity backed antenna. It is designed for ECM, surveillance and telemetry applications, and, exhibiting low pattern re-entrance and good phase stability for the entire range of its operating band, is extremely suitable for direction finding applications of various types. SPRL-A0027 features a low VSWR and high gain over the operating band and has compact and lightweight package. Operation from as low as 500 MHz is possible with reduced performance SPRL-A0027-02/-03 provides a weatherproof radome to cover the otherwise exposed PCB radiator and is for use when the antenna is to be mounted outdoors and not in a protected system enclosure.

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Frequency range 1000 - 6000 MHz
Gain 3 - 5 dBi typical (in band)
Beamwidth 70° (typical)
Polarisation SPRL-A0027/-02 SPRL-A0027-01/-03 LHCP RHCP
Axial ratio < 3 dB
Nominal impedance 50 O
VSWR < 2.5:1
Power handling 10 W CW
Connector SMA(f)
Dimensions (l x d) Ø 163 mm x 72 mm
Total mass 0.5 kg
Mounting PCD Ø140 mm (6 x M4) on back plane of antenna
Colour Chromated aluminium.
Temperature range Storage: -41 °C to +71 °C. Operation -31 °C to +55 °C
Weatherproofing IP 66 water resistant (SPRL-A0027-02/-03)

    Product Applications

    Electronic Countermeasures
  • Communications Jamming
  • Counter UAV

    Design Features

  • LHCP or RHCP antenna Compact Low axial ratio Low VSWR Wideband Low pattern re-entrance