SUBSYSTEMS

In-house microwave antenna design and engineering capabilities, backed by antenna testing facilities provide a comprehensive all weather antenna and subsystem solution to many demanding land, sea and airborne applications; EW & radar simulators, meteorological radar sensors, satellite monitoring, ELINT, COMINT and spectrum management systems.

Steatite use leading commercial EM design software from  CST Microwave  along with dedicated in-house algorithms, enabling it to analyse and optimise a wide range of microwave antenna, and subsystem designs.

We uses a mixture of design and analysis tools for its mechanical design including SolidWorks, Cosmos and FEA. Steatite designs and manufacturers subsystems by integrating combinations of wideband antennas using custom mounting structures, mounted to COTS and custom designed multi-axis all weather positioners, housed in custom designed RF transparent radomes up to 40 GHz.

Steatite Antennas provides 2 to 3 metre class antenna systems designed to operate from L band up to Ka band.

The systems provide accurate reflector surfaces, precision pointing and an astronomy grade control system together with a pedestal that is particularly rigid and can be used in high wind conditions. A wide range of receive only feeds are available; an astronomy grade Ethernet interface control system; and tilt for keyhole elimination is available as an option. As with other Steatite products, bespoke designs or modifications may be accommodated.

Typical Specifications

ReflectorsSizes from 2m to >3m
For use up to Ka band
F/D of 0.375 and surface accuracy of 0.38 mm RMS all causes
FeedsA wide variety are available, single band at L through to Ka band or wideband feeds for surveillance
MechanicalPointing accuracy: 0.010 degrees
Slew rate: up to 12 deg/sec maximum in azimuth
Azimuth travel: Zero backlash single motor, 270⁰ min up to +/-190⁰ as an option
Elevation travel: Precision zero backlash jack system, 6 to 88⁰
Feed support: Prime focus, suitable up to 25kg, standard or custom plates and adaptors available
ElectricalControl interface: Ethernet with 0.001 degree resolution
Power requirement: 200-240V 3 phase AC preferred although single phase AC or 48V DC are possible
EnvironmentTemperature range for full spec: -15 to +50⁰C
Temperature for survival: -30 to +60⁰C
Wind speed: 50 km/h operational and 160 km/h survival in stowed position
Optional ItemsElectrically controlled tilt axis adjuster for keyhole elimination and LEO applications
Fibre Optic interface converter for Ethernet control port
Additional software options for satellite communications applications and tracking
Twin azimuth drive version for operation in extreme wind environments

COTS and custom designed 0.5 to 18 GHz direction finding and omni-directional high performance spinning antenna subsystems.

The antennas are mounted on high speed rotating direct-drive positioners with complex scan control and are housed in RF-transparent, low-loss radomes. Cylindrical paraboloid reflectors are used, which provide a narrow azimuth beamwidth with broad elevation coverage. Suitable for ELINT, EW and Spectrum Management antennas applications.

Typical Specifications

Frequency (GHz)QEL-ST-0.5-18-N-SGQEL-ST-1-18-N-HGQEL-ST-2-18-N-SG-R
Gain (dBi) -2 to 22.1 – DF & -2.4 to 6.4 – Omni10 to 2313 to 24
Antenna TypeReflector and Omni-directionalCylindrical paraboloidCylindrical paraboloid
PolarisationSlant linear 45°Slant linear 45°Slant linear 45°
Azimuth beamwidtdh°
3.3 to 873 to 334 to 30
Elevation beamwidth °
15.3 to 81 – DF & 11 to 102 – Omni42 to 2020 to 35
Angular resolution °<0.1<0.1<0.1
VSWR (Typical)<2.5:1 – DF & <3.6:1 – Omni<2:1<2.5:1
Rotational Velocity200 rpm max200 rpm max200 rpm max