Cavity Foam Absorbers


ABS-ASF is a range of flat sheet flexible microwave absorbers produced from a polyurethane foam material by impregnation with a dielectric carbon loading. Different dielectric grades and thicknesses are available, the material is typically characterized by its level of insertion loss at a given frequency. By adjusting its thickness and losses one can tune insertion loss properties to optimize the required attenuation. Lossy foam sheet absorbers are a low cost solution for absorber unwanted RF signals above 1 GHz. The absorber is a carbon foam based material if needed the material can have an additional treatment by impregnation of a coating to avoid dust release.

Furthermore if needed we can supply the absorber material equipped with a fabric or coating protection. The absorber material can also be used for the isolation of antennas by insertion loss properties. ABS-ASF is often supplied with a self-adhesive backing, the material easily be cut with a knife.


  • RF-radio’s, amplifiers, oscillator cavities
  • TV satellite systems
  • Attenuate surface currents
  • Resolve RF leakage areas

Datasheet ABS-ASF 


ABS-LCF is a range of light weight open cell (reticulated) foam microwave absorbers. The single layer reticulated polyurethane foam material is coated with a dielectric carbon solution with fire retardant properties. Due to its open cell structure and a specific production process the absorber material obtains a dielectric conductive gradient to meet a excellent RF performance level. To meet customers mechanical and RF requirements different thicknesses are produced, typical thicknesses are 5, 10, 15 and 25mm. Typical frequency of operation is above 3 GHz, the thickest material is used in the low frequency range.

When a reflectivity performance is required the material can be supplied with a integrated metal backing. Similar as with our other polyurethane based absorber also ABS-LCF can be supplied equipped with a protective tissue, typically a vinyl fabric is used.


  • Around antenna feeds to reduce surface currents
  • In antenna shrouds to reduce side lobes
  • Radar absorbing blankets (often covered with vinyl fabric for harsh environment)
  • Inside RF-cabinets to suppress standing waves
  • Cross talk reduction between RF-systems

Datasheet ABS-LCF