| For active phased array radar,the array power supply is also called secondary power supply or high-density power supply.It is mainly responsible for the external primary power conversion and power supply to the T/R module on the array.The T/R module is located between the antenna and the power distribution network,and directly affects the electrical performance of the active phased array antenna by changing the amplitude and phase of the excitation current.The array power supply installed on the antenna array,the AC component superimposed on the output DC voltage-the ripple of the power supply of the array will cause the amplitude and phase error of the excitation current output by the T/R module,which will lead to the degradation of the antenna's electrical performance.The gain is reduced,the first sidelobe level is raised,etc.,which seriously affects the realization of the APAA high gain,low sidelobe and other electrical properties.Therefore,the highperformance,high-reliability,low-ripple power supply is urgently needed.At the same time,it is necessary to study the coupling relationship between the array power supply ripple and the antenna electrical performance.In this paper,the array power supply is taken as the research object.By establishing the quantitative influence relationship between the ripple of the power supply and the electrical performance of the antenna,the influence mechanism of the ripple of the power supply on the electrical performance of the antenna is proposed,and the ripple of the power supply is quickly obtained.The influence of the electrical performance of the active phased array antenna is also presented.At the same time,the influence of the array power supply ripple on the electrical performance of the antenna is given by simulation analysis,and the electrical performance of the active phased array antenna can be improved.The main work can be summarized as follows:In this paper,a typical full-bridge power supply is selected as the research object.Based on the mechanism of the ripple of the power supply,based on the path coupling theory,a key index to measure the ripple of the power supply of the array is established.The coefficient calculation model,that is,the mathematical relationship between the parameters of the array power supply circuit(output filter capacitor C,output filter inductor L and equivalent series resistance ESR)and the ripple coefficient is established,and the parameters of the device through the array power supply circuit are realized.The ripple coefficient is quickly determined.At the same time,the schematic diagram of the array power supply circuit is established in the circuit simulation software.By setting the circuit device parameters,the ripple voltage waveform and the ripple coefficient value are obtained.Finally,the circuit software obtains the result and the results of the ripple coefficient calculation formula are compared and analyzed to verify the correctness of the calculation model of the ripple coefficient.Finally,the influence law of the parameters and ripple coefficient of the array power supply circuit is further studied,which can be used for the design of high-performance array power supply to provide theoretical guidance.Based on the above-mentioned array power supply ripple coefficient calculation model,the array power supply ripple coefficient and the excitation current amplitude and phase error mathematical relationship,the ideal active phased array antenna electromechanical coupling model,the array power supply ripple and antenna electrical performance are established.The quantitative influence relationship is proposed,and the influence mechanism of the ripple of the power supply on the electrical performance of the antenna is proposed.The influence of the ripple of the power supply on the electrical performance of the active phased array antenna can be quickly obtained.At the same time,different excitation currents are simulated and analyzed.Power supply ripple and antenna electrical performance,different array power supply ripple size and antenna electrical performance,array power supply ripple,different array size and antenna electrical performance,and array power supply ripple with the influence of the electrical performance of the antenna,the electrical performance of the active phased array antenna can be improved.APAA electromechanical coupling model based on the deformation of the array power supply and the deformation of the antenna structure is established.Through the above coupling model,the integrated effect of the power supply ripple and antenna structure deformation of the APAA is derived.The gain-loss coupling model is obtained.According to the ripple coefficient,the critical value of the ripple power oefficient of the array power supply under different antenna structure deformation conditions can be reversed according to the coupling model.At the same time,the ripple of the power supply under the influence of temperature is further established.The coupling model of the antenna electrical performance is obtained,and the variation of the electrical properties of the antenna under different structural deformation conditions is obtained.The analysis results show that the variation of the array temperature has a great influence on the electrical performance of the antenna,and the cooling of the array must be strengthened and control the temperature change of the array. |
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