(University of Electronic Science and Technology of China, National Engineering Research Center of Electromagnetic Radiation Control Materials, Chengdu, 610054, China)
Keywords:
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CLC:
PACS:
TN34
DOI:
10.7502/j.issn.1674-3962.2013.08.05
DocumentCode:
Abstract:
The theory, application and development of electromagnetic discontinuities repairing materials in scattering controlling of electromagnetic discontinuities such as edge, gaps and grooves, and steps, are described in this paper. The definition and characteristic of surface electromagnetic discontinuities are analyzed, and the theory and methods for repairing electromagnetic discontinuities are also proposed. Electromagnetic discontinuities repairing materials including magnetic materials for suppression of surface wave, conductive materials for repairing the narrow gaps or grooves, and the tapered impedance materials for controlling edge scattering are discussed respectively, and one of which, the tapered impedance materials are illustrated particularly. The tapered resistive materials realized by geometric variation based on frequency-selective surfaces concepts is demonstrated having good suppression of edge scattering from a triangular metallic plate. Electromagnetic back-scattering of the as-prepared target from a triangular plate with edge tapered resistive sheet loading is proposed for both horizontal polarization and vertical polarization, and compared with that from the one of the same shape but loaded with serrated shaping or none resistive sheet on the edge. The results show that the tapered impedance materials can regulate effect edge scattering by choosing the appropriate materials and devising the reasonable gradient characteristic of the impedance. Some viewpoints of the tapered impedance material抯 future application in electromagnetic scattering and electromagnetic radiation domains are proposed