| The electromagnetic coupling between arrays seriously affects the performance of the array antenna.The mutual coupling effect will cause impedance mismatch between the array element and its feed,resulting in distortion of the pattern and an increase in the level of the array side lobe,and interference with the independent operation of the two antennas.Therefore,the coupling effect between antenna arrays must be considered in the array design and simulation process.Due to the large size and complex structure of large antenna arrays,numerical methods such as moment of methods(Mo M)cannot perform full-wave simulation analysis on large antenna arrays with limited computation memory and computation time.Thus,a new method for solving the coupling relationship between large antenna arrays needs to be studied.Solving the coupling relationship between large antenna arrays needs a large amount of calculation and long calculation time.Based on the higher-order method of moments,this article solves the electromagnetic coupling characteristics between large antenna arrays,using large-scale parallel computing technology with supercomputer,and the equivalence principle of the field.This method is mainly divided into two parts.First,the eigen-solutions of the Mo M are used to extract the surface equivalent electromagnetic flow of a small array when all the typical units in a large antenna array are fed separately.The electromagnetic characteristics of large antenna arrays can be obtained by stacking the electromagnetic currents of different small arrays,and the radiation generated is calculated.Then,according to the excitation and power of each array element of the emitting array,the field generated by the emitting array is used as an excitation of the receiving array to solve the power of the receiving array receiving the array element ports in addition to the excitation.And get the electromagnetic coupling between the two arrays.Different from the traditional full-wave methods of computing coupling relationship between arrays,this method can accurately and effectively solve the electromagnetic coupling relationship between large antenna arrays.In the thesis,microstrip antenna array is taken as an example to analyze the electromagnetic coupling relationship between microstrip antenna arrays of different scales.First,taking the small microstrip antenna array as an example,the results of this method are compared with the full-wave simulation results of the Mo M.The results are in good agreement and demonstrate the effectiveness of the method.Then the electromagnetic coupling relationship between 21x21 units,71x71 units,and 85x85 units of microstrip antenna arrays is analyzed.It is proved that this method is efficient in calculating the electromagnetic coupling relationship between large antenna arrays,and the influence of the array element receiving power in the receiving array and the spacing of the array on the electromagnetic coupling between the arrays are analyzed in detail.Finally,taking the analysis of electromagnetic coupling between two circular arrays composed of 7037 units as an example,the isolation measures of electromagnetic coupling between the two arrays are discussed.Practical examples show that this method provides an effective analysis method for electromagnetic coupling analysis between large antenna arrays in practical projects. |
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