COTS and custom designed cavity-backed spiral antennas cover the frequency range from 0.5 to 42 GHz and provide wideband performance with left or right-hand circular polarisation.
Steatite spiral antennas provide broad beamwidth with a low squint, smooth radiation patterns and purity of circular polarisation. Typical airborne and ground-based applications include 360° direction finding, spectrum management, RWR, and ESM. Steatite provides custom designed spiral antennas and if required, integrate lensed radomes to improve performance.
| QMS No. | Frequency (GHz) | Catalogue Number | Gain (dBiC) | Beamwidth (3dB) | VSWR (Typical) | Power c.w (W) | Connector |
| QMS-00767 | 0.5 to 8 | QSP-RC-0.5-8-S-SG | -6.5 to 1.4 dBiL | 48 to 139 | < 1.4 :1 | 2 | SMA |
| QMS-00314 | 0.5 to 22 | QSP-RC-0.5-22-S-SG | 0 to 5 | 60 to 115 | <1.5:1 | 2 | SMA |
| QMS-00762 | 1 to 18 | QSP-RC-1-18-S-SG-R | 0 to 7 | 20 to 112 | <2.5:1 | 2 | SMA |
| QMS-00991 | 2 to 6 | QSP-RC-2-6-S-R | -3.6 to 4.5 dBi | 63 to 135 | Typically <2:1 | 2W CW | SMA Female |
| QMS-00760 | 2 to 18 | QSP-RC-2-18-S-SG-R | 1.3 to 5.3 | 53 to 142 | <2.5:1 | 1 | SMA |
| QMS-00935 | 2 to 40 | QSP-RC-2-40-K-SG | -7.7 to 4.7 dBi | 57 to 132 | < 2.0 :1 (Typically) | 2W CW | K-Type Female |
| QMS-00992 | 6 to 18 | QSP-RC-6-18-S-R | 1.5 to 5.3 dBi | 52 to 99 | Typically <2:1 | 2W CW | SMA Female |
| QMS-00049 | 18 to 42 | QSP-LC-18-42-K-SG | 1 to 4.2 | 47 to 94 | <2.5:1 | 2 | K |
| QMS-00051 | 18 to 42 | QSP-RC-18-42-K-SG-L | 2.2 to 6.2 | 30 to 80 | <2.5:1 | 2 | K |
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