Coupled Structural-electromagnetic-thermal Modelling And Analysis Of Active Phased Array T/R Module With Knowledge

The T/R module(transmit/receive module)is the core component of the active phased array antenna and is the basis for the active phased array antenna.The performance index directly affects the overall electrical performance of the antenna.Since the electrical performance of the T/R module is determined by the internal RF device and the transmission structure,with the development of T/R module towards high frequency,high density and miniaturization,the thermal power consumption of components makes the components in high thermal environment,which leads to the problem of structural-electromagnetic-thermal coupling becoming the bottleneck of T/R module achieving high performance.The existing structuralelectromagnetic-thermal coupling modeling analysis method ignores the performance temperature drift characteristics of the device and generates a certain model error,which leads to a decrease in the accuracy of the solution.In addition,some structural random deviations in the manufacturing process will cause fluctuations in the electrical performance of the T/R module.The traditional analysis method for electrical performance fluctuations has a large amount of calculation,low solution efficiency,and increases the design cycle of T/R module.To this end,this paper first establishes the T/R module field-circuit coupling theory model,realizes the comprehensive analysis of the device and passive transmission structure,and then establishes the theoretical model of the influence of structural error on the performance of passive transmission structure,and proposes a knowledge-based sample.The temperature drift characteristic regression model of the device is used to establish the multi-physics coupling model of T/R module with integrated knowledge in the field coupling theory formula.Secondly,the T/R module transmission characteristic analysis of integration knowledge is carried out.The temperature knowledge sample is obtained by designing the temperature drift characteristic experiment of the power amplifier device,and the temperature drift characteristic model of the power amplifier device is established based on the improved extreme learning machine algorithm;The influence of the electrical properties of the transmission line is analyzed by thermal-structural-electromagnetic coupling using an indirect coupling method.Then,the analysis results of the device and the passive transmission line are respectively introduced into the field-circuit coupling model for numerical solution,thereby completing the analysis process of the transmission characteristics of the T/R module including the temperature drift of the device.The comparison of the experimental results shows that the relative error of the component transmission coefficient amplitude is reduced from 4.38% to 1.01%,and the phase relative error is reduced from 4.63% to 2.78%.Finally,the influence of structural deviation on transmission performance is studied in combination with engineering background,and a parametric macro model between structural deviation and transmission performance is established based on adaptive parametric modeling.Then the modeling method is analyzed by component system,and the fluctuation range of T/R module performance under the influence of the result deviation is obtained.The rationality and high efficiency of the method are proved by comparison with the traditional method.Then the adaptive parameterization modeling method is used to analyze the structural tolerance of the component,and the rationality of the analysis method is proved by engineering case.