Microwave manipulation for absorption, cloaking and scattering using plasma metamaterial composite with frequency dispersion

High-power microwave is one of the promising candidates for wireless power transmission, although available tools for microwave manipulation are limited since typical specifications of integrated and discrete electronic microwave devices are for low-power operation (less than 100 mW). So far we have proposed plasma metamaterial composites (PMCs) to regulate microwaves, where a PMC, which is generated by electric power with tens of watts, is more compact in size [1] and more robust against high-power microwaves than conventional solid-state metamaterials. In this study, we demonstrate various functions of PMCs for microwave manipulations, like absorption, cloaking, and scattering. Since plasma and metamaterial are two independent elements as wave media, a PMC exhibits complicated frequency dispersion, leading to variety of microwave manipulation. For instance, results in this experimental study suggest that one of our PMCs works as an absorber around 2.6 GHz, as a cloaking device around 2.90 GHz, and as a scatterer around 3.1 GHz. This fact indicates that PMCs with metamaterial design and plasma density control can work as a high-power microwave manipulator. [1] A. Bambina, S. Yamaguchi, A. Iwai, S. Miyagi and O. Sakai, AIP Adv. 8, 015309 (2018)