​​ETS-Lindgren's Flat Laminate Absorber, commonly known as a lossy foam block is a moderate performance broadband microwave absorber with graded dielectric material. The absorber is fabricated using three layers of carbon impregnated foam. By using a front layer with a small loss tangent, a center layer with a moderate loss tangent, and a bottom layer with a higher loss tangent, an electrical taper is achieved that yields a material with an average reflection coefficient of -20 dB over a wide frequency range.                          

A 100 percent inspection of the flat laminate series material is performed by measuring the reflection coefficient at the frequencies of 0-18 GHz shown under the Product Charts tab. The reflection coefficient is guaranteed to be -20 dB (1 percent) or less at the test frequency.

ETS-Lindgren's Flat Laminate Absorber or lossy foam block is flexible and easily cut using a band saw or a knife with a serrated edge. Best performance is achieved when the absorber is mounted in intimate contact with a metal surface. The front surface of the Flat Laminate Absorber is painted a light blue color.

Key Product Information

Specifications Select a tab below for more information

Frequency Range by Model
ModelFrequencyTest Frequency
FL-1125CL2.4 GHz & above3 GHz
FL-2250CL940 MHz & above1.7 GHz
FL-4500CL455 MHz & above800 MHz

Dimensions by Model
ModelThicknessBase SizeWeight
FL-1125CL2.9 cm   (1.14 in)61 cm x 61 cm (24 in x 24 in)0.2 kg   (0.44 lb)
FL-2250CL5.7 cm   (2.24 in)61 cm x 61 cm (24 in x 24 in)0.4 kg   (0.88 lb)
FL-4500CL11.4 cm   (4.49 in)61 cm x 61 cm (24 in x 24 in)0.9 kg   (1.98 lb)

View BIM Models of our Product Options Below:



Key Features

  • ​Flexible and Easy to Cut
  • Average Reflection Coefficient of -20 dB over a Wide Frequency Range

Literature and Videos

Date Last Updated: Wednesday, February 24, 2021
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