Microwave Absorbing Foam
RFET - Reticulated Foam Absorbers
Reticulated foam is an urethane-based foam with a well-defined open-cell structure. The cell size can be chosen to optimize penetration of the conductive coating to which it is adhered. Laird Technologies uses two separate processes to produce our reticulated foam absorber. Our unique spray process applies a coating that is graded through the thickness of the foam. The grading of the coating also produces an electrical grading that results in a material with excellent broadband reflectivity reduction.
Laird Technologies also uses a dip process to produce foam with uniform electrical properties. RFRET-LS is produced to a specific insertion loss (dB/in.) at a specific frequency (generally 3 or 10 GHz).
Laird Technologies also dips RFRET-CV, a convoluted egg-crate shaped foam. This shaping allows for graded impedance which provides broadband reflectivity reduction. RFRET-CV is produced in thicknesses from 1.5” to 4” (38.1 mm to 101.6 mm) and is used when broadband performance from 2 to 18 GHz is required. The product can be supplied with a bonded-on ground plane and pressure sensitive adhesive.
Applications
- Used around antennas to provide isolation or side lobe reduction
- Antenna hats
- Test boxes
- Networking equipment
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