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Progress in smart microwave materials and structures
DOI:10.1088/0964-1726/9/3/304.png)
摘要
En 中文
Smart windows that regulate the transmission of visible light are well known, but with the continuing interest in modifying the radar signature of military hardware, there is a need also for smart microwave windows and surfaces. The paper reviews progress on the fabrication and characterization of poly(aniline)-silver-polymer electrolyte composite materials. Discs and films of this material have been characterized over the frequency range 0.5-18 GHz. The materials demonstrate a rapid and reversible change in their microwave reflectivity when a small de potential is applied;across them. The best samples have exhibited a reflectivity change in excess of 20 dB in a coaxial line test set. Cyclic voltammetry studies of these composite materials are discussed in the light of a poly(aniline)/polymer electrolyte/silver single-cell model. The effect of the poly(aniline) counter ion, the polymer electrolyte and the application of a bias potential on the de and microwave results is discussed. Geometries of smart surfaces that might utilize these materials are then proposed and their characteristics are evaluated.
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