A LOW-FREQUENCY MODEL FOR WEDGE OR PYRAMID ABSORBER ARRAYS .2. COMPUTED AND MEASURED RESULTS

Based on the theoretical model developed in Part I of this two-part pa per, we present numerical results for the plane-wave reflection coeffi cient from arrays of pyramid-cone absorbers when the period of the arr ay is smaller than half a wavelength. Comparison is made with results of a moment-method calculation, as well as with experimental measureme nts. The model is then used to modify the design of some existing type s of commercially available absorbers for reduced reflection in the fr equency range of 30-300 MHz. These improved absorbers have been instal led in an anechoic chamber used for electromagnetic compatibility and electromagnetic interference (EMC/EMI) measurements. Site attenuation measurements from this chamber are presented which show closer corresp ondence to an ideal open-field test site.