Finite Element Simulation And Uncertainty Analysis Of Electrical Performance Of Phased Array Antenna

Phased array antennas have broad application prospects in military fields such as detection and tracking,remote warning,and the quality of electrical performance directly reflects the value of it.Uncertainty problems exist widely in the field of radar antenna engineering.Research of using a reasonable method of uncertainty analysis of the electrical performance of antennas has great significances for shorten the design cycle and improve their service performance and reliability.In this paper,the uncertainty analysis of the phased array antenna is mainly carried out from the two aspects of the core component T/R module and the deformation of antenna front.A complete electromagnetic simulation model of the T/R module is established,and a method for propagation analysis of the uncertainty of the amplitude and phase of the T/R module based on dimensionality reduction integration is developed.To quantify the uncertainty of the wind load of the phased array antenna in service conditions,the dynamic electrical performance analysis of the antenna under random wind load is carried out.Main work of this paper is as follows:(1)The HFSS electromagnetic simulation model of the T/R module was established,and a method of uncertainty propagation analysis based on dimensionality reduction integral for the amplitude and phase electrical performance of T/R modules was proposed.Reveal a robust design method based on sensitivity for the electrical performance of T/R modules.For this paper,introduces the operation process and key points of 3D modeling of T/R components using HFSS electromagnetic simulation software in detail based on the theoretical basis of microstrip transmission theory and impedance matching principle.Then,use the Sobol sensitivity analysis method based on variance decomposition to select the factors that have a greater impact on the amplitude and phase electrical performance of T/R modules,and propose a method of T/R modules uncertainty propagation analysis based on univariate dimensionality reduction integration,which can efficiently solve the probability density function of T/ R modules electrical performance index.Last,a robust design of the electrical performance of T/R modules is carried out by bring an additional objective function of sensitivity to obtain a new optimization model.A complete uncertainty propagation analysis and robust design of the phase difference of a certain S-band T/R module are performed to verify the effectiveness of the method through a specific engineering example.(2)A dynamic analysis method of array antennas front deformation under wind load and a dynamic analysis method of electrical performance due to the deformation were proposed.Firstly,a fluid-structure coupling dynamic simulation analysis of the antenna front deformation considering the static and dynamic characteristics of the wind load under the antenna service conditions is carried out,from which the time-varying dynamic deformation field distribution of each element position of the array antenna is obtained,and then,the distribution of the antenna front deformation is imported into the derived antenna pattern function when the antenna front deformation occurs.Eventually,the dynamic effect of wind load on the electrical performance of phased array antenna is described by the radiation pattern during dynamic deformation of the array.This research can provide a meaningful reference for the analysis of antenna time-varying electrical performance analysis and the optimal compensation design of antenna array deformation and so on.