Study On Wideband Electromagnetic Characteristics Analysis Of Finite-Sized Periodic Arrays And Antennas

Finite-sized periodic array and antennas have been widely used in the wireless communication system and the military fields.Broadband electromagnetic characteristics calculations are necessary in both their analysis and design.The conventional method of momets(MoM)is an accurate numerical method,which has been widely used in electromagnetic analysis,but its computational memory requirements are large and computation time is long.Therefore,this method is only suitable for analyzing small and medium-sized problems.The accurate sub-entire domain(ASED)basis function is suitable for finite-sized periodic array analysis and can greatly reduce the unknown quantity.However,it is a single frequency technology.For the wideband electromagnetic problems,the researchers proposed some techniques to improve the efficiency,such as interpolation method,frequency-independent reaction,and asymptotic waveform estimation.In addition,the accuracy of numerical results is affected by the feed model.In this paper,the ASED basis function and interpolation technique are combined to analyze the wideband electromagnetic characteristics of finite-sized periodic arrays.In order to improve the accuracy of the algorithm,the wideband is divided into several sub-bands and the different interpolation functions are used for them.For the shortcomings that the matching matrices need long CPU time and require large storage memory,the fast fill-in technique to impedance matrix are introduced to improve the efficiency by utilizing the structure periodicity.The numerical examples are used to verify the proposed method.The simulation results show that the proposed algorithm are in good agreement with the traditional ASED basis function method,and the computational efficiency is improved.For the antenna radiation analysis,the enhanced gap source is used as the feed model.Combining the enhanced gap source model with the interpolation technique to analyze the wideband characteristics of the antenna.The simulation results show that the results of this method are in good agreement with the ones of the unused interpolation technique.Not only the numerical results are stable,but also the computational efficiency are improved.