RF Connector To Phased Array Antenna Influence Mechanism And Field-Circuit Coupling Analysis

With the development of active phased array antenna towards high density and modularization,a large number of RF connectors are needed between antenna array module and tr RF module.It can be seen that RF connector is the bridge of signal transmission between antenna array and TR module.The connection mode of RF connector between antenna array and TR module is floating blind insertion.Multiple RF connectors between modules are floating blind insertion at the same time.Floating blind insertion will produce insertion error,which will cause connection mismatch and eventually affect the signal transmission between TR module and antenna array.In the actual simulation model,the influence of the floating blind insertion of RF connector is often ignored,which leads to the mismatch between the theoretical simulation results and the measured results.Aiming at the influence of RF connector floating blind insertion on the electrical performance of phased array antenna,this paper focuses on the key technologies of RF connector field circuit coupling modeling analysis and phased array antenna field circuit coupling analysis.Firstly,a field circuit coupling modeling method for RF connector is proposed.Firstly,the relationship between the contact pressure of the contact area and the electrical parameters of the equivalent circuit of the RF connector in different plug-in posture is established,and then the field circuit coupling modeling of the RF connector is completed according to the equivalent transmission line theory and the cascade transfer parameter matrix.The problem that the traditional electromagnetic simulation model can not model the contact area in different plug-in posture of the RF connector leads to the electrical performance separation is solved The accuracy of electrical performance analysis of RF connector is improved.Secondly,an interval analysis method of RF connector electrical performance based on field circuit coupling is proposed.Through the parametric modeling of the RF connector and the determination of the range of equivalent circuit parameters in the contact area,Monte Carlo simulation combined with the field circuit coupling model is used to complete the electrical performance interval evaluation of the RF connector under different plug attitudes.In order to solve the problem of large fluctuation in the electrical performance of floating blind plugin of RF connector,an electromechanical collaborative optimization method based on field circuit coupling is proposed.Through the synchronous optimization of insertion force and insertion loss,the maximum insertion force of a certain type of RF connector is reduced by0.5N,the insertion loss is reduced by 0.3d B,and the flatness is 0.5d B compared with the original structure,which improves the stability of RF connector connection.Finally,aiming at the influence of RF connector floating blind insertion on the electrical performance of phased array antenna,according to the field circuit coupling model of RF connector and the existing multi field field circuit coupling model of phased array antenna,a new multi field field circuit coupling model of phased array antenna is established.Firstly,the gain changes of single signal channel before and after the optimization of RF connector are simulated and compared,and then the field circuit coupling cascade analysis of RF connector,antenna array and TR module is carried out to obtain the phased array antenna pattern.Compared with the simulation results,the gain error is less than 0.5d B,the side lobe level error is less than 0.15 d B,and the pointing error is less than 0.07 degrees,which indicates that the optimized RF connector floating blind insertion reduces the impact on the electrical performance of phased array antenna.