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Steatite Q-par Antennas has been designing and manufacturing comprehensive defence antennas and subsystem solutions since 1973.

High-specification COTS and custom-designed microwave antennas

Steatite has its own in-house design and engineering department, which is backed by testing facilities.

The company excels in the research, design and manufacture of high-specification commercial-off-the-shelf (COTS) and custom-designed microwave antennas and subsystems. These antennas and subsystems typically operate from 100MHz to 500GHz.

Steatite has a large portfolio of wideband defence antennas suitable for applications that include military airborne radar warning receivers (RWR) and electronic countermeasures (ECM).

Steatite supplies dual linear and dual circular polarised, sinuous antennas for direction finding, ELINT, RWR and ESM airborne, sea and ground-based applications.
The firm provides a wide range of COTS and custom-designed prime focus, offset, solid, and segmented reflector / feed antenna combinations, providing high-gain and low sidelobes with low VSWR levels.
Omnidirectional antennas provide wide bandwidth up to 40GHz. Vertical and slant polarised antennas are available and suitable for EW, SIGINT, direction-finding and spectrum management applications.
ELINT and COMINT 0.5GHz to 18Hz direction-finding and omnidirectional high-performance spinning antenna subsystems are provided by Steatite.
Cavity-backed spiral antennas cover the frequency range of 0.5GHz to 42GHz wideband performance, with left or right hand circular polarisation.
Standard gain and wideband horn antennas are part of the Steatite range. They provide 400MHz to 500GHz, with typical gain values from 10 to 20 dBi.
Comprehensive all-weather antenna and subsystem solutions are supplied for demanding land, sea and airborne applications.

The company regularly undertakes antenna-related research, design, and manufacture for defence and government clients, including development studies, prototyping, and technical concept studies.

Dual linear and dual circular antennas for hostile signals

Dual linear and dual circular polarised, sinuous antennas simultaneously handle signals of any two orthogonal polarisations, providing intercept opportunities for a wide range of arbitrarily polarised hostile signals, as well as wide bandwidth and beamwidth.

Spiral antennas offer wide beamwidth with low squint, smooth radiation patterns, and purity of circular polarisation.

Typical airborne and ground-based applications include 360° direction-finding, spectrum management, radar-warning receiver (RWR), electronic countermeasures (ECM), and electronic surveillance measures (ESM).

Advanced electromagnetic design software for optimised microwave antennas

Steatite uses leading commercial electromagnetic design software and dedicated in-house algorithms. This enables it to analyse and optimise a wide range of microwave antenna, and subsystem designs, while mechanically using a mixture of design and analysis tools for mechanical design.

The company designs and manufactures antenna subsystems. It does this by integrating combinations of wideband antennas, using custom mounting structures, COTS and custom-designed multi-axis all-weather antenna positioners, housed in custom-designed microwave transparent radomes up to 40GHz.

COTS and segmented reflector / feed antennas for ELINT and EW applications

COTS and custom-designed solid and segmented reflector / feed antenna combinations are available.

These provide high-gain and low sidelobes with low-voltage standing wave ratio (VSWR) levels, ideal for applications such as ELINT, electronic warfare (EW), direction-finding, threat emitters, and communication systems.

Linear, circular polarisation, and dual polar feeds are available either with SMA, N, K type and waveguide flanges.

Ultra wideband omnidirectional antennas for driection-finding applications

Steatite’s portfolio of ultra wideband omnidirectional antennas are used widely for direction-finding and spectrum management applications.

These antennas provide a wideband performance of up to 42.5GHz and are available vertically or slant polarised.

The firm’s antennas allow users to replace multiple antennas across the bandwidth with just one, resulting in reduced costs and helping reduce critical weight and space requirements.

Direction-finding and omnidirectional spinning antenna subsystems for broad elevation coverage

Steatite produces 0.50GHz to 18GHz direction-finding and omnidirectional high-performance spinning antenna subsystems.

These antennas are mounted on high-speed rotating direct-drive positioners with complex scan control. They are housed in a microwave transparent, low-loss radome.

Paraboloid reflectors provide a narrow azimuth beamwidth with broad elevation coverage.

Octave and multi-octave wideband horn antennas for EMC immunity and HiRF testing

Octave and multi-octave wideband horn antennas are produced by Steatite. These have typical gain values from 10dBi to 20dBi.

Higher gain horn antennas are typically more than 20dBi. A variety of custom wideband horn antennas are also available, including rectangular, conical, multimode, sectoral, double and quad ridged, and dual polarised, with maximum frequencies up to 500GHz.

Horn antennas can be adapted to meet customer specific requirements, for example waveguide-flanged and high-power transition versions are available.

Applications include EW, SIGINT, test and measurement, such as electromagnetic compatability (EMC) immunity, emission and high-intensity radiated fields (HiRF) testing.