Optimum design and matching of single/double layered absorption materials

In order to research the effects of electromagnetic parameters and the thickness on microwave absorption properties of one-layer and two-layer coatings,a computer simulation was carried out according to the theory of electromagnetic wave transmission.The calculation results well display the relationships among the values of electromagnetic parameters,thickness of the coating,frequency and microwave absorption properties.The thickness matching and impedance matching of the two-layer coating were also investigated and discussed.It is indicated that the microwave absorption peak moves to low frequency with the increasing thickness and becomes multi-peaks.The absorption materials present an excellent property when the matching constant M is 0.25.For the two-layer coating of microwave absorption materials,thickness matching and impedance matching directly affect the absorption properties of the materials.