chambers in the millimeter wave region. All AEC materials offered are NRL fire retardant versions. Millimeter Absorber AEC-MM Series As the wavelengths of the room's operation... the irregular geometry will limit the amount of energy that will propagate into the absorbing medium. AEMI has developed a series of materials specifically for millimeter wave use.... Versions Available: Type AEC-4-MM is the standard material optimized for millimeter wave operation. By proper selection of the carbon loading, reflectivities on the order of 45 to 50 dB...