Abstract
In this paper, the research of nonlinear cylindrical metastructure was obtained. An algorithm for finding the total field of a nonlinearly loaded perfectly conducting cylinder covered with a metamaterial (MM) layer based on Maxwell’s equations with nonlinear boundary conditions on the surface of nonlinear loads (NL) was developed. A software package implementing this algorithm was created. Based on the results of numerical calculations of the program, the scattering diagrams of a metal cylinder with NL, covered with a layer of MM at the fundamental, second, and third harmonics were obtained. The dependences of the harmonics of the scattered field on the parameters of nonlinear loads were also studied. With the help of numerical simulation using Ansys HFSS, the extract procedure of the effective parameters of cylindrical MM was realized. Based on the results of calculation and numerical simulation, a model of a nonlinear cylindrical structure of two radii was made and an experimental study was carried out. As a result of the experiment, the frequency characteristics of the metastructure were obtained at various angles of incidence of the wave. The results of numerical simulation were confirmed by the results of the experiment. It is shown that the use of the provided nonlinear cylindrical marker with metamaterial makes it possible to obtain the levels of the first and second harmonics in a scattered field of the same order. This structure can be used as a nonlinear marker in both military and civilian areas.
Highlights
The software package allows to calculate the total field of a cylinder covered with a layer of metamaterial, taking into account the position of nonlinear loads when excited by a magnetic current filament, at a given number of harmonic frequencies
The development of the nonlinear marker model was based on a rigorous theoretical approach using nonlinear boundary conditions
The resulting system of nonlinear integral equations was transformed into a system of nonlinear algebraic equations, which were solved using a developed program based on Broyden’s method
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Tags can be placed on vehicles or people in high traffic areas such as security guards, construction workers, police officers, etc In this concept, nonlinear tracking is performed by marking the targets of interest with special nonlinear markers. Nonlinear tracking is performed by marking the targets of interest with special nonlinear markers Such markers allow converting the reflected signal to higher frequencies. Frequency conversion to higher frequencies allows a wider bandwidth to be used, increasing the information transfer rate. We propose a nonlinear cylindrical marker using a metamaterial which provides increasing the signal-to-noise ratio at the input of the receiver of a nonlinear locator (compared to a conventional cylindrical marker without the use of metamaterial), and as a consequence, increasing the range of a nonlinear locator operation. And when a marker is placed on a search object, it is often difficult to use flat
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