The AF Series Broadband Foam 2.000″ thick RF absorber is the thickest standard option in the 3PB Solutions line of carbon-loaded polyurethane foam absorbers, engineered for the lowest-frequency coverage in the line. The homogeneous carbon loading attenuates electromagnetic energy through dielectric loss as the wave passes through the foam volume, providing broadband absorption from 1.0 to 40.0 GHz with no conductive backing required.

At 2.000″ thick with a 100 loading level, this material takes the depth-over-density approach to its limit: -10 dB/in insertion loss at 10 GHz through two full inches of absorbing volume. The light loading gives the front face the closest impedance match to free space in the AF line, minimizing reflection and letting the long path through the material do the work. This is the option for problems at the bottom of the band, from 1 to 4 GHz, where thinner and denser materials reflect too much energy to absorb effectively. For applications with less available depth, the 1.000″ option covers the middle ground, and the 0.250″ option delivers maximum loss per inch for higher frequencies.

Key Specifications
Base material: Carbon-loaded open-cell polyurethane foam
Thickness: 2.000″ (50.800 mm)
Weight: 0.661 lbs/ft²
Frequency range: 1.0 to 40.0 GHz
Insertion loss: -10 dB/in at 10 GHz
Operating temperature: -45 to +120°C
Sheet sizes: 24″ x 24″ (-000) and 12″ x 12″ (-001)
Adhesive: 3M 9485PC PSA backing available (-01 option)
Compliance: Halogen-free, RoHS/REACH compliant

Common Applications
Low-frequency free-space absorption from 0.5 to 4 GHz, benchtop chamber lining, isolation between antennas and systems operating in L and S bands, and applications where the lowest achievable front-face reflection in a flat-sheet lossy foam is required.

Need a custom die-cut shape, a machined 3D geometry from a CAD file, a custom loading level, or a large production quantity? Contact our engineering team for a quote. Custom die-cut parts with PSA backing ship in 2 to 3 weeks.

For insertion loss performance curves across frequency and thickness, see the AF Series datasheet, or email us or give us a call at 855-785-5660.