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Q180 Series Spiral Antenna

A broadband feed, consisting of a tapered transmission line balun with a current suppressing shroud, allows the Q180 Series to provide 18:1 bandwidth. It operates effectively as low as 1 gigahertz despite an outside diameter of only 2.7 inches.

The Q180-Series Antennas can be amplitude tracked on a 100% basis versus factory standards, ensuring interchangeability at the system level. This characteristic makes the Q180-Series Antenna an ideal element for array and direction-finding (DF) applications.

Q180 Series Antenna Specifications

Download the Q180 Series Antenna Spec Sheet
Electrical
Frequency range 1.0 - 18.0 GHz
VSWR 1 GHz 3.5:12-18 GHz 2.5:1
Gain -16 dBiC @ 1 GHz
-6 dBiC @ 2 GHz
0 dBiC @ 4-18 GHz
Gain tracking
-3, -4 (only) ±1 dB at bore sight
±1.5 dB at 45°
Polarization
-1, -3 LHCP
-2, -4 RHCP
Beamwidth (nominal) -3 dB: 110° at low frequency to 60° at high frequency
-10 dB: 170° at low frequency to 85° at high frequency
Axial ratio (nominal) 4 dB at 1 GHz (on axis)
5 dB at ±45° off axis
2 dB at 2 18 GHz (on axis)
4 dB at ±45° off axis
Beam squint 6° (max) across 1-18 GHz
Power handling 1 watt
Mechanical
Connector SMA jack, straight
Weight 1.0 lbs max
Finish Chemical film per MIL-C-5541

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