RF & Microwave Absorbers

• FU-SE Product Line is a complete range of high performance pyramidal microwave absorbers.
•  Available in wide range of thickness and absorbancies.
• Variety of Thickness gives the chamber designer the opportunity to chose grades appropriate for specific frequencies and incidence angles.
• Constructed using low density, flexible foam, impregnated with a carbon black ferrite formulation to achieve the desired electrical performance.
• The pyramidal structure gives it the geometrical matching and the carbon dispersed gives the attenuation required at near normal incidences.
• Provide engineers with the building blocks needed in the design and construction of RF absorbing surface used in anechoic chambers, antenna assemblies and microwave measuring facilities.

Advantages:

• Absorption over a wide frequency range.
• Long product life.
• High performance, upto -50 dB attenuation.
• These absorbers are supplied with a fire retardant finish.
• RoHS compliant.

• FW-SE absorber is a complete range of high performance wedge microwave absorbers having approximated same properties at grazing incidences as our FU-SE Series-Pyramidal Microwave Absorbers at near normal incidences.
• Constructed using low density, flexible foam, impregnated with a carbon black, ferrite formulation to achieve the desired electrical performance.
• At higher angle of incidences back scatter is significantly reduced.
• Available in wide range of thickness and absorbency.
• Variety of thickness gives the chamber designer the opportunity to choose grades appropriate for specific frequencies and incidence angles.

Advantages:

• Absorption over a wide frequency range.
• Long product life.
• High performance, up to -50 dB attenuation.
• These absorbers are supplied with fire retardant finish.
• RoHS Compliant.

Features:

• Chemical Composition: Carbon ferrite impregnated polyurethane foam.
• Power handling capacity: 0.5 Watt/cm²
• Our foam absorbers are fire retardant with zero halogen means thereby avoid formation of toxic gases like HCl/HBr and poisonous gases like phosgene.

Specification:

Reflection loss (dB) of Wedge type (FW-SE) at normal incidence is 3dB to 5dB down in comparison of our pyramidal microwave absorber (FU-SE).

Main Markets:

• Defense Research & Development Organization
• Educational Institutes.

• A PU Foam based broadband microwave absorber.
• Almost equally effective at wider angles of incidence as well.
• Light weight, flexible & easy to cut.
• Polyurethane foam material (flexible) block having a front surface cut to a convoluted (Egg carton) shape, dipped in absorbing slurry providing desired electrical grading.
• Because of the rounded convolutions, and lacking sharp corners and points, FC absorber is the proffered absorber for millimeter wave frequencies, and for very wide incidence angles.
• Standard size is 600 mm x 600 mm. Custom tailored sizes can also be supplied.
• Standard Thickness: 100 mm. Available in different thicknesses.

Advantages:

• Our foam absorbers are fire retardant with zero halogen means thereby avoid formation of toxic gases like HCl / HBr and poisonous gases like phosgene.
• RoHS Compliant.

Features:

• Colour: As desired, generally available in blue color.
• Typical Weight of 60 cm x 60 cm sheet: 1.5 kg.

Main Markets:

• Defence Research & Development Organization
• Educational Institutes.

Walk on absorbers are manufactured from our standard blocks of PU foam based pyramidal/wedge absorbers with a profiled section filled with a low loss, polystyrene foam thus making it a flat faced absorber.

Advantages:

• Our foam absorbers are fire retardant with zero halogen means thereby avoid formation of toxic gases like HCl / HBr and poisonous gases like phosgene.
• Ro HS Compliant.
• Maximum Service temperature: 90 Degree Centigrade.

Features:

• This absorbers are flat faced absorbers.
• It is used in the areas on floor.

Main Markets:

• Defense Research & development Organization
• Educational Institutes.

• Lightweight, flexible, broadband, Multilayer PU foam based microwave absorber.
• Fabricated using six layers of carbon impregnated foam.
• FU-ML is an electrically graded flat PU foam based microwave absorber.
• Carbon loaded laminate polyurethane sheets.
• Can be readily cut on a band saw, with scissors, or a sharp knife.
• Available in various thicknesses from 18 mm to 120 mm and beyond.
• FU-ML is not waterproof and will not operate correctly when wet, since there is not washout.

Features:

• Our foam absorbers are fire retardant with zero halogen means thereby avoid formation of toxic gase like HCl / HBr and poisonous gases like phosgene.
• RoHS Compliant.

Main Markets:

• Defence Research & Development Organization
• Educational Institutes
• Antenna Manufacturer.

• Our total pyramidal FHY type absorber are pyramidal shaped flexible polyurethane foam based carbon/ferrite powder loaded hybrid absorber which are made for use in EMC test chambers. These FHY absorbers are to be combined with ferrite tiles to perform at lower frequencies and a low density matching dielectric layer to make hybrid absorber suitable at higher frequencies as well. FHY absorber is available in three thicknesses viz 30cm, 45cm & 60cm thick and termed as FHY-12, FHY-18 and FHY-24 respectively.
• Our truncated FHY absorbers are available in truncated version where tips of the pyramidal are removed for saving space in chambers and tip breakage thus making a more rugged product. This is done at the expense of their performance at higher frequencies. Truncated absorbers are available in 30cm & 45m thickness and are termed as FHY-12-T and FHY-18-T, respectively.

Advantages:

• Absorption over a wide frequency range.
• Long product life.
• High performance, upto -50dB attenuation.
• These absorbers are supplied with a fire retardant finish.
• Ro HS Compliant.

Features:

• Our FHY absorbers are optimized for a particular ferrite tiles/dielectric combination.
• Our foam absorbers are fire retardant with zero halogen means thereby avoid formation of toxic gases like HCl/HBr and poisonous gases like phosgene.
• Ro HS Compliant.

Main Markets:

• Defence Research & Development Organization
• Educational Institutes.

• Semi Open PU foam based broadband type embedded pyramidal microwave absorbers.
• Specially formulated coatings for better ageing characteristics.
• Light weight, flexible and easy to cut.
• Polyurethane foam sheet dipped in absorbing slurry providing desired electrical grading.
• Standard Size is 600mm x 600mm. Custom tailored sizes can also be supplied.

• Thicknesses are 45mm, 35mm, 30mm, 25mm, 15mm, 12.5mm and 10mm (FAS-45, FAS-35, FAS-30, FAS-25, FAS-15, FAS-12.5 and FAS-10). Larger thickness can be produced to suit low frequency applications.
• Colored surface should face the incident radiation.
• The back surface (black) should be close to the metallic surface to achieve best performance.
• Provides better wider angle performance than multilayer flat absorber.

Advantages:

• Colour: As desired, generally available in blue color front surface.
• Dimension: 60cm x 60cm
• Chemical Composition: Carbon ferrite impregnated polyurethane foam.
• Power handling capacity: 0.5 Watt/cm²

Features:

• Ozone resistant.
• RoHS Compliant.
• Front surface color is Blue.
• Regains its absorbing property after drying.

Main Markets:

• Defense Research & Development Organization
• Educational Institutes.

• Broadband, Conical, Weather prrof, Suitable for sea apllications Radar Absorbent material.
• Conical front side of face radiation to be absorbed.
• Walk-able: CRA-18, CRA-18-P & CRA-18-P-M is rigid enough to be used on walk on areas.
• Frequency Region: 5.0 GHz to 18.0 GHz and beyond.

Features:

Performance under wet condition remains practically unchanged w.r.t. dry condition performance at all angles/ polarizations/ frequencies.

Specifications:

• At normal Incidence & upto 45° from Normal: Min. reflection loss (angle of incidence equals angle of reflection) w.r.t. metal plate of same size shall be -15dB at 5.0 GHz, rising to min. -17dB at 8.0 GHz and min. -20dB at 10.0 GHz and higher frequencies in both polarizations.

• At 60° from Normal: The reflection loss is down by less than 5dB w.r..t. normal and upto 45° performance at all frequencies and in both polarizations.

• Under Wet Condition: Performance under wet condition remains practically unchanged w.r.t. dry condition performance at all angles/ polarizations/ frequencies.

Main Markets:

• Defence Research & Development Organization
• Navy

• RA is a thin, flexible, weatherproof, resonating rubber based microwave absorbers.
• Design Frequency Range: 1GHz to 18GHz
• Highly reliable & stable as an outdoor Radar Absorbent material.
• Suitable for Narrow Frequency Band Operations.
• Available with a metal backing in 300 x 300mm size.

Features:

• Unlike typical iron-filled rubber absorbers, no oxidation is possible due to chemical nature of the filler component.
• Can be readily cut with a sharp knife and template and conforms to mild curvatures.
• Highly flexible for easy processing and installations.

Specifications:

15dB at ± 5% band with around the center frequency (as compared to the flat metal plate of the same size) Tested as per IEEE Std. 1128/1998: IEEE Recommended practice for RF Absorber Evaluation using NRL Arch method.

Main Markets:

• Defence Research & Development Organization
• Navy