Flat Laminate Absorber

Product enquiry for Flat Laminate Absorber

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ETS-Lindgren’s Flat Laminate Absorber, a moderate performance broadband microwave absorber is a graded dielectric material that has been widely accepted in the microwave and antenna fields.

The absorber is fabricated using three layers of carbon impregnated foam. By using a front layer with a small loss tangent, a centre 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% inspection of the FL series material is performed by measuring The reflection coefficient at the frequencies shown below. The reflection coefficient is guaranteed to be -20 dB (1%) or less at the test frequency.

ETS-Lindgren’s FL 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 FL series absorber is painted a light blue colour.



Freq. (LB/FT2)

Test Freq.


Base Size



3.5 GHz & above

6 GHz

1.9 cm   (0.75 in)

61 cm x 61 cm (24 in x 24 in)

0.1 kg   ( 0.22 lb )


2.4 GHz & above

3 GHz

2.9 cm   (1.14 in)

61 cm x 61 cm (24 in x 24 in)

0.2 kg   ( 0.44 lb )


940 MHz & above

1.7 GHz

5.7 cm   (2.24 in)

61 cm x 61 cm (24 in x 24 in)

0.4 kg   ( 0.88 lb )


455 MHz & above

800 MHz

11.4 cm   (4.49 in)

61 cm x 61 cm (24 in x 24 in)

0.9 kg   ( 1.98 lb )

Key Features

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

Application Notes