Abstract
Method suitable for computer aided analysis and design of broadband electromagnetic absorber is presented. Elements of multilayer structure are simulated using transmission matrix approach. Procedure suitable for absorber optimization is described. Possible structures for absorber material are derived and analyzed
Highlights
Thorough measurement of antenna characteristics and electromagnetic compatibility tests are best performed in anechoic chambers
Free space propagation conditions are approximated by elimination of wave reflections
Distribution of electromagnetic field, close to TEM wave in free space is obtained in limited volume inside TEM cell
Summary
Thorough measurement of antenna characteristics and electromagnetic compatibility tests are best performed in anechoic chambers. They provide conditions of wave propagation close to free space and very good isolation from unwanted external fields. Free space propagation conditions are approximated by elimination of wave reflections. Since pyramid size is comparable or larger wavelength, gradual change of material density causes very little reflection. As opposed to anechoic chambers, these don’t use pyramidal absorbers. Distribution of electromagnetic field, close to TEM wave in free space is obtained in limited volume inside TEM cell. Reflection from the cell bottom is suppressed with compact size electromagnetic absorber. The aim of the research is to design the multilayer absorber with varying dielectric materials for each layer. Research tasks include the multilayer absorber reflectivity calculation as well as finding the optimal structure for the absorber
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