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The tile used for lining anechoic chambers comes in two geometries. The most common is a flat ceramic tile about 6 mm thick and 1 00 mm 2 . The other version is in the form of a cast ceramic grid. The early versions of the grid were on the order of 1 in. thick. A newer grid version is on the order of one-half inch thick. The ma­ terial is very heavy, and is normally installed onto plywood panels attached to the walls of the shielded enclosure. Thus, the overall weight of the installation is con­ siderably greater than that of a foam installation.

The thicker the product, the lower the frequency of operation of the material, as illustrated in Figure 3 . 1 2 [ I I ] . This product is used in many laboratory applications. The theory describing the opera­ tion and design of these types of absorbers can be found in Ref. 1 4 . 5 Hybrid D ielectric Absorber Multilayer absorber is very efficient in terms of providing loss in a minimum of height. 2) C- \ . 5 C-3 C-4 3 . 8( \ . 0) 1 0. 6 \ m" ( 2 ft"). 6 GHz and above AN73 AN74 AN75 AN77 AN79 Properties of the Multilayer Absorber M ax i mu m Power Reflectivity Bands Covered K 1% X, Ku, K 1% C, A, 8, X, 1% Ku, K S, C, A, 8, X, Ku, K L, S, C, A, 8, X, Ku, K L, S, C, A, 8, X, Ku, K, UHF 1% 1% 1% Sheet Size 61 em x (24 in.

The carbon loading is high), then the reflectivity drops at the low end of the curve and peaks at the higher thicknesses as shown in Figure 3 . 5 . If the loading is too light, then the whole curve shifts to *The curve was developed by the author in 1 975 from published absorber performance tables. The curve has been validated in many measurements of pyramidal absorber materials. 32 ELECTROMAGNETIC ABSORBING MATE RIALS 60 r------,---,---, " . . . . 54 Over Load ing - Normal - - - Under Loading 48 .

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