Study And Application Of Wave Concept Iterative Method

With the rapid development of the microwave and millimeter-wave integrate circuit, various kinds of numerical methods for electromagnetic analysis is developed to accommodate with it. However, most of the conventional numerical methods are restricted by the disadvantages of large memory requirement and long computing time. In this paper, a new method named wave concept iterative process (WCIP) based on transformation between space domain and spectral domain is introduced. In this method, the discontinuity plane of microwave circuit is divided into small rectangular cells, then the metal region, source region,dielectric region and the other regions of the interface plane are represented by different scattering matrix, respectively. The boundary condition of the electric field and the current density is expressed in the term of incident wave and reflected wave. The iterative process includes a fast Fourier mode transform between space domain and spectral domain, which is combined with the reflected operator in spectral domain and the scattering operator in space domain. And the iterative process is finished until convergence of field, then the field distribution can be calculated. The introduction of the two-dimensional fast Fourier mode transformation algorithm reduces the calculation complexity for it avoids the base function and inverse conversion of large matrix.The derived WCIP theory formulations for various micro-strip plane layered structures is presented in detail and illustrated by MATLAB programming. Some practical examples are calculated by the WCIP program which verifies the efficiency of this method.