COTS and custom designed Dual Linear and Dual Circular Polarised, sinuous antennas for direction finding, ELINT, RWR and ESM airborne, sea and ground-based applications.
The Steatite family of sinuous antennas simultaneously handle signals of any two orthogonal linear polarisations and simultaneous left and right-handed circular polarisations dependent on antenna design.
This provides intercept opportunities for a wide range of arbitrarily polarised signals, from devices also giving a wide bandwidth and broad beamwidth.
The sinuous antennas can also be used as feeds for reflector antennas where they give the advantage of a stable phase center across the frequency band.
As with other Steatite products, bespoke designs or modifications may be accommodated.
| Frequency (GHz) | Catalogue Number | Polarisation | Power c.w. (W) | VSWR (Typical) | Gain (dBi) | Beamwidth (3dB) | Isolation (dB) |
| 0.2 to 2 | QSI-DL-0.2-2-S-SG | Dual Linear | 10 | <3.0:1 | -4.2 to 3.6 | 91.6 to 69° | >35 |
| 0.4 to 2 | QSI-DL-0.4-2-N-SG-R | Dual Linear | 2 | <3.6:1 | 1.3 to 6.4 | 62 to 48° | >34 |
| 0.5 to 3 | QSI-DL-0.5-3-S-SG-R | Dual Linear | 2 | <2:1 | -0.2 to 5.8 | 56 to 96° | >40 |
| 0.7 to 4 | QSI-DL-0.7-4-S-SG | Dual Linear | 10 | <2.6:1 | 0 to 4.1 | 55 to 94° | >34 |
| 2 to 18 | QSI-DL-2-18-S-SG | Dual Linear | 1 | <3.2:1 | -3.8 to 4.4 | 64 to 109° | >32 |
| 2 to 24 | QSI-DL-2-24-S-SG | Dual Linear | 2 | <3:1 | -8 to 3 | 145 to 60° | >30 |
| 0.7 to 4 | QSI-DC-0.7-4-S-SG | Dual Circular | 2 | <1.4:1 | -1 to 2.2dBiC | 102 to 56° | – |
| 2 to 18 | QSI-DC-2-18-S-SG-L | Dual Circular | 2 | <2:1 | – 5.2 to 2.6dBiC | 42.6 to 95° | – |
