Research On Integrated Design Method Of Antenna And Stealth Radome

In order to solve the problems of poor aerodynamic performance,small airspace coverage,large weight,large space occupied by the system,and poor stealth performance caused by the separate design of the antenna and the radome,this paper carried out the integrated design of the antenna and the stealth radome Method research.The integrated technology of antenna and stealth radome will make the antenna and radome an inseparable whole,not only has the ability of electromagnetic wave radiation and reception,but also has the characteristics of electromagnetic stealth,and also has the ability to protect the antenna from the harsh external environment.The integration of the antenna and the radome involves the performance requirements of both electromechanical aspects,namely electromagnetic performance and structural rigidity.It will be a typical integration object of structure and function.It is necessary to start from the disciplines of structure,electromagnetics,materials,etc.to carry out research on the integrated technology of antenna and radome.Based on the frequency-selective filtering characteristics of the frequency-selective surface(FSS),it can realize the performance of reflection electromagnetic wave in frequency band and reflection electromagnetic wave out of the band.As well as the low-profile and easy-conformal characteristics of microstrip antennas.The integrated system composed of antennas and FSS is designed to analyze the electromagnetic performance,mutual coupling characteristics and its mechanical properties as a bearing structure,The purpose is to lay the foundation for the structural and functional integration of the microstrip antenna and the FSS radome.The specific work is as follows:(1)Design of integrated unit of microstrip antenna and FSSAfter the antenna and the FSS form an integrated unit,the electromagnetic interaction between the FSS and the antenna is bound to be introduced,thereby affecting the respective electrical performance of the two.In order to solve this problem,an analysis of the integrated unit of FSS and antenna is proposed.First,according to the design principles of FSS and antenna,the FSS unit and microstrip antenna unit with better electrical performance are designed respectively,and the electromagnetic characteristics of the microstrip antenna unit and FSS unit are given,including the radiation characteristics and scattering of the antenna unit.Characteristics and analysis of FSS transmission characteristics.Then,on this basis,the FSS unit and the microstrip antenna unit are constructed as an integrated unit,and the mutual coupling characteristics of the FSS unit and the microstrip antenna unit are studied,mainly to explore the scattering characteristics and radiation characteristics of the integrated unit by the structural factors influences.Finally,based on the influence of structural factors on the electrical performance of the integrated unit,a comprehensive optimization design method for radiation and stealth of the integrated unit is proposed.By establishing an optimization model of the integrated unit and applying an optimization solution method based on genetic algorithm,the optimization design.Through numerical simulation,the high radiation performance of the integrated unit and low out-of-band radar cross section(RCS)are realized.According to the simulation analysis,the gain of the integrated unit is up to 7.45d B.S₁₁ is-31.3d B The single-station RCS of the integrated unit outside the working frequency band of the antenna is 0.8d Bsm lower than that of the antenna(2)Electromagnetic Analysis of Microstrip Antenna and FSS Integrated ArrayWhen the integrated unit of antenna and FSS is to form an array,its radiation characteristics and scattering characteristics need to be evaluated.To this end,the analysis and research of the integrated array of antenna and FSS has been carried out,mainly including the analysis of radiation characteristics and scattering characteristics.For planar arrays,the radiation characteristics of the integrated array are realized based on the principle of array superposition,and a 8?8 planar array simulation example is used to verify the correctness of the analysis method;for curved conformal arrays,the integration is based on mathematical coordinate rotation The radiation characteristics of the curved surface conformal array are analyzed,and a case analysis is carried out on a 1?5 cylindrical curved surface conformal array to verify the correctness of the method.Then,based on the scattering mechanism of the microstrip antenna and the theory of radar cross section,the variation rule of RCS in the process of forming an integrated array is analyzed.(3)Electromechanical coupling analysis of honeycomb sandwich antenna and FSS radomeThe integration of the antenna and the radome requires the integration of the two structures of the antenna and the FSS radome.It can be used not only as an electromagnetic functional part for receiving and transmitting wireless electromagnetic waves,but also as a mechanical bearing functional part of the weapon platform structure.To this end,based on the above-mentioned integrated unit and array electromagnetic analysis,an electromechanical coupling analysis of the cellular sandwich antenna and the FSS radome was carried out.First,in the integrated array of antenna and FSS radome,through the loading of honeycomb,skin and other structures,the realization scheme of structural and functional integrated components with mechanical bearing capacity is given,and the integrated components of loaded honeycomb and skin structure are analyzed Effects of radiation performance and scattering performance.Then,considering that the load of the integrated component in the service environment will cause the structural deformation of the integrated component,which will lead to the deterioration of the electrical performance,for this purpose,an electromechanical coupling model of the effect of structural deformation on the electrical performance is established.The relationship between radiation performance and scattering performance.