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PU foam based wedge absorbers

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PU foam based wedge absorbers has the properties similar to the pyramid absorbers with same height, it also has excellent performance in 100MHz-110GHz. It is mainly applied in large compact anechoic chamber and tapered anechoic chambers, the main advantage is to reduce the back scattering of pyramid absorbers and get an even more quiet quiet zone.

Reflection loss under vertical incidence (-dB @ GHz)
670 - PU foam based wedge absorber
  • Such absorbers have a wedge-shaped appearance, with blue color (it can be selected as request)
  • Pliable and flexible, the pyramids won’t bend in long-term use, and its absorbing properties won’t be changed within 10 years.
  • Oxygen index ≥ 29% (GB/T2406-93), which belongs to flame retardant B2 level (GB8624-1997)
  • Good environmental performance, all raw materials can meet the environmental requirements, no volatile, no smell and non-toxic.

Installation method (general indoor application)

it generally use an environmental protective adhesive to paste the absorbers on the shield body; when the absorbers’ height is below 500 mm, Velcro installation can be applied; furthermore, we can also adopt the fasteners to install the absorbers, which would facilitate the replacement of absorbers and the relocation of chambers.

Working condition
  • Long-time working temperature: -50 °C ~ 90 °C
  • Short-time working temperature: -100 °C ~ 120 °C
  • Relative humidity: 55% ± 15%
    Frequency range: 30 MHz ~ 110 GHz

Please note : For the data below 500 MHz, it is obtained by low-frequency coaxial test method (GJB5239-2004); while for the data above 1 GHz, it is obtained by far-field RCS test method (GJB2038A-2011). The performance data listed in the above table is the guaranteed data, and the measured data would be equal to or better than the guaranteed data. The bold part number is a stock item and can be delivered immediately. Certification: CE RoHS

Product specification and part numbers
Part number Base size (mm x mm) Pyramid quantity
per unit
Unit size A x C x B
(mm x mm x mm)
Standard weight kg/m2)
3670-200 600 x 600 6 200 x 10 x 5 8
3670-300 6 300 x 10x 7 10
3670-450 3 450 x 20 x 7,5 15
3670-700 600 x 400 2 700 x 20 x 10 24
PU foam based wedge absorbers technical drawing
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