Lossy Foam Absorbers


Lossy Foam Microwave (RF) Absorbers are a lightweight conductive carbon loaded sheet stock providing broadband insertion loss at microwave frequencies. Lossy Foam Absorbers are designed with a constant coating to exhibit high reflection loss and are intended to be applied to metal surfaces inside microwave cavities, housings, radomes, network enclosures, or antennae. Lossy Foam absorbers are the lowest cost solution for attenuating energy at frequencies from 1 GHz to 18 GHz.

Lossy Foam Microwave (RF) Absorbers are tried and tested. They are one of the most known of and recommended absorber materials available. Lossy Foam Microwave (RF) Absorbers consist of carbon impregnated foam. They are used in a variety of applications such as lowering a cavity’s quality factor in RF amplifiers, oscillators, cabinets containing microwave devices, computer housings, isolating antennae via insertion loss, reducing surface currents on radiating elements and outer ground-plane type surfaces and also reducing reflectivity of objects such as metal.


  • Antenna Pattern Performance
  • Sidelobe/backlobe reduction
  • Resonant Cavity Attenuation
  • EMI Reduction
  • Rx/Tx Antenna Isolation
  • Radar Cross Section Reduction

Features and Benefits

  • Lightweight polyether reticulated foam
  • Cost effective broadband material
  • Easily applied with PSA
  • Most broadband absorber material
  • RoHS Compliant
  • Halogen Free

Standard Absorbers

dB Loss (@ 10 GHz)Thickness (in/mm)Part Number

Ordering Information

This materal is available in 610 x 610mm (24″ x 24″)  sheets only. However we can cut the sheets to shape and size as per your requirements. 

It is available with and without PSA. If you require PSA please add the suffix “-PSA” to the required part number. For example for 3.2mm thick Lossy Foam Absorber with PSA the part number would be “MA-LF-1-PSA”.

For more information, please Contact Us