PU foam based pyramid absorbers

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Series

Solution for 3, 5 and 10 m EMC chambers in the market

These absorbers are the most popular solution for 3m, 5m and 10m EMC chambers in the market. They are composed of pyramidal, full tip SAM or truncated SMT pulsing the matching layer to separate the pyramidal part from the ferrite part. Through optimization, this product has a superb performance across 30MHz to 18GHz. The ferrite performs from 30MHz to 1GHz and the foam performs above 1GHz.

Prototypes are made and the design is tested. Results become part of a valuable feedback loop for refining our design further. Broadband Pyramidal Absorber is a low density polyurethane foam, filled with high loss dielectric material in open cell structure and finished with blue paint.

The general base size is 60 cm x 60 cm with 50 mm to 1200 mm height pyramidal. It’s flexible and light weight, can be attached on the wall easily. It is a high performance broadband RF absorber and widely used for Anechoic Chambers.

Reflection loss under vertical incidence (-dB @ GHz)

3640 - PU foam based pyramid absorbers

Characteristics
  • Such absorbers have a pyramid-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)
  • Power handling capacity up to 1.5 kW/m²
  • Good environmental performance, all raw materials can meet the environmental requirements, non volatile, no smell and non-toxic.
  • Working conditions: general indoor application
  • 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 500MHz, it is obtained by low-frequency coaxial test method (GJB5239-2004); while for the data above 1GHz, 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. Certification: CE ROHS

PU foam based pyramid absorbers technical drawing schematic diagram
Product specification and part numbers
Part number Base size (mm*mm) Pyramid quantity per unit Unit size A*C*B (mm*mm*mm) Standard weight (kg/m2)
3640-50 600 x 600 900/576 50 x 18.5 x 15 1.5
3640-96 600 x 600 225 96 x 36 x 20 2.2
3640-190 600 x 600 81 190 x 65 x 50 4
3640-300 600 x 600 36 300 x 100 x 60 7
3640-495 600 x 600 16 495 x 145 x 65 11
3640-700 600 x 600 9 700 x 195 x 130 16
3640-1000 300 x 300 1 1000 x 300 x 150 22
3640-1200 400 x 300 1 1200 x 400 x 200 25
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