Research On Integrated Equivalent Modeling Method Of Electrically Large Platform And Antenna

With the rapid development of wireless communication technologies and the diversification of communication functions,more and more antennas are installed on various electrically large platforms(ELP),so that the entire antenna systems have become more and more complicated.The electrical size of the platform is big,and the experiment research of the integration of platform environment and antenna are always restricted by test site,equipment and funding,which all make the integratetd analysis of platform and antenna more difficult.In order to rapidly analyze the radiation performance.of the antenna on the ELP and to achieve the efficient analysis of communication,performance,electromagnetic compatibility(EMC)and electromagnetic environment on the ELP,this thesis has performed the research on the integrated equivalent modeling of ELP and antenna.In this thesis,the equivalent models of the antenna and the platform are respectively established,and the method of the integrated equivalent modeling of platform and antenna is explored.The innovations and main research contents are as follows:First,based on uniform theory of diffraction(UTD),a sparse equivalent model of the low-profile antenna is proposed.According to the radiating and scattering mechanism of the low-profile antenna,the equivalent model based on the equivalent principle and near-field scanning is presented,which overcomes the difficulty of direct modeling when an antenna's design detail is complex or unknown.Next,the equivalent source of the equivalent model has been sparsified by applying the UTD.Then the sparse source reconstruction method is introduced to reconstruct the equivalent source of the sparse equivalent model,which not only improves the efficiency and accuracy of source reconstruction but also reduces the number of required near-field samples.Second,based on the equivalent edge current(EEC),the sparse equivalent model of the low-profile antenna is presented.There are some conditions for the application of the UTD method,for example,the geometry of the ground plane of the low-profile antenna must be known.To solve the above problem,EEC has been proposed to represented the edge diffraction effects,which overcomes the limitation of the UTD-based sparse equivalent model.Since the equivalent.source of the model is partially sparse,a partially sparse source reconstruction method is introduced to reconstruct the equivalent source.Finally,the performance of partially sparse reconstruction method and full sparse reconstruction method is compared by numerical examples,and the effectiveness of the EEC-based equivalent model is verified too..Third,the equivalent scattering truncated model of the ELP is discussed.According to the scattering mechanism of the ELP,the main scattering characteristics are analyzed.Then the equivalent scattering truncated model of the ELP is established to meet the actual application requirements,which greatly reduces the time and memory cost of the radiation characteristics analysis of the antenna installed on the ELP.Fourth,a radio-frequency(RF)communication system is constructed to validatete the effectiveness of the integrated equivalent model of antenna and platform,Firstly,the suiltable transceiver antennas are designed based on electromagnetic simulation,and the experimental system is built by selecting the signal souree module for the actual application scenario.Secondly,based on meurement in the anechoic chamber,the equivalent model is calibrated and its validity is also verified.Thirdly,a simple non-stop electronic toll collection(ETC)system is designed,and the received power of receiving antenna is measured.The agreement between the measurement date and the simulation data validates the effectiveness of the integated equivalent model.In the end,we make a summary of the research work and the future work is discussed.