Nonlinear cloaking at microwave frequencies

摘要

The ideas of employing the unique properties of metamaterials for cloaking and invisibility applications has beenrecently suggested and investigated by several groups, because they may find numerous applications in physics andtechnology. While many of the recent designs of the cloaking structures are based on the transformation optics and exactformulas, the original concept suggested by Tretyakov employed the periodical set of parallel-plate waveguides with theheight smoothly varying from H to h in order to reduce drastically the total scattering cross-section of a given object andto obtain broadband cloaking effect. Our paper is devoted to improvement of this design to make tunability and nonlineareffect. The Tretyakov’s design was scaled for Ku-band frequencies and the cloak was placed into rectangular waveguide.The broad transmission band (“invisibility region”) was obtained. The tunability of transmission band was realized byaddition the capacitors into the cloak, between metallic plates. The cloaking system was simulated numerically by CSTMicrowave Studio. The possibility of invisibility switching on/off was shown by changing of capacity of varactor diodesfrom 0.4 to 3.4 pF by incident power. The nonlinear cloak behavior was shown at microwaves.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.