| In the analysis of electromagnetic scattering properties of the metal targets, a lot of the targets have the nature of cylindrically periodic, it is a worthy research direction to efficiently calculate the electromagnetic scattering characteristics of such targets. This paper studies the frequency-domain integration method and the time-domain integration method for the scattering problems of discrete body of revolution (DBOR) which has the cylindrically periodic characteristics.Firstly, the method of moment (MoM) in frequency-domain for calculating the electromagnetic scattering of DBOR is introduced. The structural features of the DBOR are analyzed, and then the basic principles of DBOR method and the matrix equations are formulated. A novel modeling and meshing method for the discretization of DBOR is proposed to deal with the periodic boundary conditions. The method greatly reduces the number of unknowns, the memory consumption and the impedance matrix filling time.Secondly, the basic principles of time-domain electric field integral equation (TDEFIE) are introduced. In order to solve the wideband electromagnetic and the transient scattering problems of cylindrical periodic structure, the TDEFIE method of DBOR is presented in this paper. The TDEFIE method of DBOR use less memory and impedance matrix filling time than the general time-domain integration methods when dealing with such cylindrical periodic structure.Furthermore, the fast Fourier transform (FFT) is introduced to accelerate the matrix-vector multiplication and reduce the solving time both for the MoM of DBOR in frequency-domain analysis and the TDEFIE of DBOR in time-domain analysis.Finally, the electromagnetic scattering results of some typical cylindrical periodic structures like the ball, ring and turbine are provided. It can be seen that, in the frequency-domain and time-domain analysis, the proposed methods of DBOR in this paper can greatly reduce the memory consumption and the matrix filling time. |
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