Microwave Absorbing Foam
RFML - Multilayer Foam Absorbers
RFML is a multilayer foam absorber consisting of three sheets of RFLS material. The layers vary in insertion loss from the front to the back of the material. For example, RFML-75 is 0.75” (19.1 mm) thick and consists of three layers of RFLS 0.25” (6.4 mm) bonded together. The top layer is very lightly loaded to provide a good impedance match to free space. This matching layer reduces the energy reflected off the surface of the material. The second and third layers have increasing loss and the net effect is a material that has broadband reflectivity reduction.
The thickness range of the RFML product is 0.375” to 4.5” (9.5 mm x 114.3 mm), and the standard sheet size is 24” x 24” (609.6 mm x 609.6 mm). The foam can be cut with a band saw or electric knife into file shape.
The material can be supplied with a bonded-on group plane and pressure sensitive adhesive. It can also be supplied weatherproof by bonding a neoprene or vinyl fabric to the material.
Applications
- Reduce crosstalk between antennas
- Reduce antenna sidelobes
- Minimize reflections in test equipment
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