NUMERICAL STUDIES OF A NONLINEAR WEDGE-SHAPED METASURFACE FOR THE DEVELOPMENT OF RECOMMENDATIONS FOR CONTROL OF THE REFLECTED ELECTROMAGNETIC FIELD OF AN AIRCRAFT WING

Abstract

The aim of the study is to evaluate the effectiveness of using a nonlinear metasurface on a wedgeshaped object to control the electromagnetic field reflected from it. In the study, a nonlinear meta-surface is a two-dimensional ordered array, the elements of which, interacting with the electromagnetic field of an incident wave, are able to control the amplitude and phase of the transmitted and reflected waves, thus allowing the wavefront to be controlled. The task of the research is to find and verify a method for analyzing wedge-shaped structures with nonlinear loads of various configurations. When solving the researching task, a model of the trailing edge of a wing of an aircraft with longitudinal nonlinear loads on both sides is considered. The studied nonlinear elements are modeled by concentrated loads in zones on the surface of the trailing edge of the aircraft wing. By selecting the parameters of concentrated loads, the type of their nonlinearity is set. A method of numerical analysis of the model based on solving the scattering problem and the problem of electromagnetic field radiation is described. A step-by-step sequence of actions is presented from creating a three-dimensional model of the trailing edge of an aircraft wing, to setting calculation parameters and obtaining results. The results of modeling the trailing edge of an aircraft wing with a different number of nonlinear loads, different positions of loads relative to each other and from the edge, and different parameters of concentrated loads are presented. The obtained results of electrodynamic modeling allow us to do conclusions regarding the parameters of loads, their number and location. Various combinations of loads were investigated, notably two, three and four nonlinear loads on each face. The results for an ideally conducting wedge with two loads showed low efficiency in terms of the possibility of increasing the levels of multiple harmonics relative to the main level in an electromagnetic field scattered from the structure. The analysis of a wedge with three loads showed the possibility of increasing the levels of multiple harmonics by 13 dB in the ±5° angle sector. Stable, in a wide frequency band, an increase in the level of multiple harmonics by 13-23 dB in the ±80° angle sector is achieved when four loads are placed on the trailing edge of the aircraft wing.