| High density phased array antenna is a new trend of the development of large radar antenna with the gradual miniaturization.Along with the development of the phased array antenna research,form the coupling analysis model of phased array antenna performance,but due to consider when building a coupling analysis model problems of primary and secondary,a lot of performance is ideally to consider,then ignore the high density T/R modules of phased array antenna performance change,T/R modules between the antenna unit and RF connector performance change,And the effect of performance change on the performance of high density phased array antenna under the service of antenna unit.At the same time,the high density phased array antenna in the actual installation and practical work,the introduction of a large number of uncertainties,will also affect the performance of the high density phased array antenna,and even make the performance of the whole antenna can’t work properly.Aiming at the above problems,this paper studies and verifies the effectiveness of the multi-field-field-path coupling model of the high-density phased array antenna,and then further improves the field-path coupling model of the high-density phased array antenna by taking the performance of RF connectors into consideration.Under the influence of uncertain factors,the interval description method and the calculation method of complex interval are adopted to calculate the interval performance of T/R components and the electrical performance interval of the whole antenna.The specific work content of this paper is organized as follows:(1)A multi-field-field coupling model for high density phased array antenna is proposed.Based on the assumption that all components of phased array antenna are perfectly matched in service,a multi-field-field-path coupling model based on displacement field-temperature field-electromagnetic field is constructed,and the information fusion of three fields in the coupling model is described.In the field path coupling analysis of T/R component,the layer by layer equivalent calculation method of two-port network is derived in detail.In the performance model construction of the whole antenna,the antenna element and component are equivalent to the form of cascade of microwave port network,and the excitation transfer relationship between each module of the whole antenna is derived in detail.The effectiveness of the field-path coupling model of T/R components and the performance of the whole antenna is verified by the measured data of the high-density phased array antenna operating in X-band.(2)A modeling method of high density phased array antenna field-path coupling model under the influence of connectors is proposed.This method takes into account that the performance of the connector between the T/R component and the antenna unit will affect the performance of the whole antenna under actual machining and service.Based on the method of two-port network equivalence,the excitation transfer relationship of T/R components,connectors and antenna elements is investigated.The performance changes of T/R component before and after connecting with the connector,the performance changes of antenna unit before and after connecting with the connector,and the performance changes of the whole antenna under the influence of the connector are compared and verified respectively.The simulation results show that in the actual service,the change of the connector’s performance will directly affect the matching degree of each structure and the performance of the whole antenna.(3)An uncertain analysis method for electrical performance of high density phased array antenna is proposed,which combines field-path coupling and complex interval operation.The calculation formula of the electrical performance interval of the whole antenna is discussed in detail,and the correctness of the calculation method is verified by numerical examples.After the correctness of the calculation method is ensured,the method is applied to the calculation of the transmission performance interval of T/R module transceiver branch and the electrical performance interval of phased array antenna.At the same time,the traditional Monte Carlo simulation method is used to obtain the performance interval of T/R module transceiver branch and phased array antenna.The validity and accuracy of the proposed uncertainty analysis method are verified by comparing the two interval results.(4)A set of field path coupling analysis software for conformal bearing antenna feeders is developed.The software is developed by C# and MATLAB.C# is used for the development of the main interface,and MATLAB is used for the compilation of performance analysis methods of each field.The software is proved to be feasible and effective in practical engineering by analyzing an example of conformal bearing antenna. |
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