Modeling And Design Of Electromechanical Coupling Of Flexible T/R Module

Flexible active phased array antenna is a kind of antenna that can change the beam direction and scan by adjusting the amplitude and phase of the excitation current of the array element through a specific feed mode.Compared with traditional active phased array antenna,flexible active phased array antenna has the characteristics of flexibility,high reliability and strong detection performance.It has broad application prospects in radar systems of civil and military platforms such as space-borne,missile-borne,warplane early warning,ship-borne early warning and space-based early warning.As the core module,the flexible T/R module(transmit/receive module)integrated with it determines the electrical performance of the antenna.Flexible T/R module is composed of passive transmission structure and active chip.With the development of flexible phased array antenna toward high density,high flexibility and high reliability,the electromechanical coupling effect between the passive structure inside the flexible T/R module,active circuit and module performance becomes more and more obvious,which seriously hinders the improvement of module performance.For the electromechanical coupling of module,the following research is carried out.Firstly,an electromechanical coupling modeling method of flexible T/R module is proposed.The deformation error of the passive transmission structure in the displacement field is introduced into the field-circuit coupling model of the module,and the electromechanical coupling model for the large deformation bending of the module is established.The “field”analysis of the large deformation bending of the passive transmission structure and the“circuit” analysis of the active chip are combined to calculate the dynamic response of the module during the large deformation bending.It overcomes the problem that the traditional linear finite element method can not analyse the module in large bending deformation.Secondly,a self-compensation optimization design method of flexible T/R module is proposed.Through the collaborative optimization of electromagnetic and circuit of self compensating structure,the performance of module in large deformation bending is automatically compensated to ensure the stability of electrical performance of module,and to overcome the defect of traditional structural and electrical compensation method that can not compensate the performance loss of module well.Finally,a flexible T/R module with Island Bridge interconnection is developed by using the self compensation optimization design method,and the experimental test is carried out.The simulation results are compared with the experimental test results.The average relative error of the transmit channel gain is1.04%,and the average relative error of the receive channel gain is 0.73%,which shows the effectiveness of the modeling method in this paper.Compared with the flexible T/R module designed by the traditional method,the bending angle of the module is increased by 20%,and the transmission channel gain is increased by 10.38%,and the receiving channel gain is increased by 12.06%,which verifies the effectiveness of the design method.