In The Numerical Calculation Of Electromagnetic Field Interpolation And Extrapolation

Interpolation and extrapolation are in common use in the field of computational electromagnetics, such as antenna designing, microwave technique, radar scattering model, and so on. The reasonable and suitable application of the interpolation and extrapolation can make computation in electromagnetics more efficient. The main work includes:1. To develop several programs based on the method of moment (MoM):The method of moment in conjunction with the magnetic field integral equation and pulse basis function for calculating the radar cross section (RCS) of the three-dimensional metal objectThe method of moment in conjunction with the hybrid field integral equation, vector triangular basis function and full-wave discrete imaging (FWDI) for calculating the input characteristics of the microstrip antennaThe method of moment in conjunction with the free space periodic Green's function for calculating the one -dimensional frequency selective surfaces (FSS)Software for meshing the surface of the object with triangular faces2. To develop and improve some interpolation methods:MBPE technique has been discussed, and been used to interpolate the radiation pattern of antenna and object scattering in the frequency and angular domain simultaneously.Neville algorithm has been developed to interpolate the RCS data of the object in the frequency and angular domain simultaneously.3. To develop and improve AWE method:AWE method is applied to calculating the input characteristics of the microstrip antenna at f first time, as the relative permittivity of the substrate is variable.AWE method is applied to calculating medium coated object, and makes the procession of the computing more efficiently.AWE method has been developed into the two-dimensional AWE method and been used in the analysis of the microstrip antenna and RCS modeling. The results show the two-dimensional AWE is very efficient.AWE method is combined with the neural networks. The hybrid technique can be used in the condition of multi-variables, even one or more variables are related with the dimension.