This is the most widely used absorber product and is generally found in Anechoic Chambers and in Free Space Chambers used for Antenna Pattern Measurements (APM) and Radar Cross Section (RCS) measurements etc. Larger absorbers are also used in some EMC chambers.
Absorbers are manufactured from low density polyurethane foam impregnated with a dielectric 'lossy' solution. The pyramidal shape produces an impedance gradient which results in high performance / reflectivity levels in Anechoic Chambers at both normal and off-normal angles of incidence.
The absorber is treated to provide a finished product that meets the fire retardant requirements of NRL specification 8093 tests 1, 2 and 3, MS-8-21 tests 1,2 and 3 and other International specifications.
The absorber is usually spray finished with a coat of light blue paint although other colours are available on request.
The typical nominal size of Pyramidal RF Absorber ranges between 4 in. (105mm) and 72 in.(1830 mm). Base dimensions are 610x610 mm. Please contact Panashield for full physical and performance data on our range of absorber materials.
Absorbers are installed in chambers using contact adhesive. Velcro can also be used although this is usually limited to absorbers with a depth of 24"(610 mm). For very large depth absorbers a steel base can be factory installed on the absorber base and fixed to the chamber with a clip and rail system.