Research On The Reduction Technology Of Ultra-wideband Radar Scattering Cross Section Based On Metasurface

With the development of military radar detection technology,the strength of Radar Cross Section(RCS)reduction capabilities determines the actual combat performance of military equipment such as satellites,fighter jets,and missiles.Narrowband RCS reduction cannot cope with the ever-changing battlefield detection methods.The design of broadband RCS to reduce the super-surface is of great significance to future wars.In this paper,a variety of ultra-wideband RCS reduction metasurfaces are designed based on the different RCS reduction methods of metasurfaces for electromagnetic waves.The main research results and contents are as follows:First of all,this paper designs a circuit to simulate the metasurface structure and conducts physical processing tests.The test results are in good agreement with the simulation results under three different angles of electromagnetic wave incidence ?=5°,?=8°,and ?=10°.Then,this paper uses the genetic algorithm based on the array factor formula to optimize the metasurface array,realizes the RCS reduction of 6 times the frequency,and conducts the physical processing test.Since the genetic algorithm did not consider the mutual coupling between the sub-arrays,the space mapping algorithm was introduced to further optimize the parameters,and finally a metasurface array with 7.8 octave RCS reduced by 10 d B was designed.Finally,based on the principles of chapters three and four,this paper designs a metasurface based on the combination of resistive wave absorption and phase control,introduces resistance into the square ring unit,and finally designs a 10 octave RCS reduction of 10 d B The same simulation results show that the RCS reduction performance of 10 d B under the irradiation of oblique incident electromagnetic waves within 30°Both the circuit simulation absorbing structure and the artificial magnetic conductor supersurface array designed in this paper have certain theoretical and practical value.The former simulation is simple,light and easy to process.The latter proposes an efficient metasurface optimization method,which provides new ideas for the simulation and optimization of subsequent broadband metasurface arrays.