Abstract
This paper proposes a hybrid full-wave analysis using Finite-Difference Time-Domain (FDTD) and Wave Concept Iterative Process (WCIP) methods, developed to analyze locally arbitrarily shaped microwave structures and Multilayer Planar structure. Using the equivalence principle, the original problem can be decomposed into two sub regions and solve each sub region separately. An interpolation scheme is proposed for communicating between the FDTD fields and WCIP wave, which will not require the effort of fitting the WCIP mesh to the FDTD cells in the interface region. This method is applied to calculate the scattering parameters of arbitrary (3-D) microwave structures. Applying FDTD to 3D discontinuity and WCIP to the remaining region preserves the advantages of both WCIP flexibility and FDTD efficiency. A comparison of the results with the FDTD staircasing data verifies the accuracy of the proposed method.
Highlights
The Wave Concept Iterative Process (WCIP) method is a widely used numerical technique for characterizing various electromagnetic problems.It has long been recognized that the accuracy and efficiency of the method can be dramatically improved through the use inhomogeneous layers and for planar structures with a curved boundary due to the staircasing approximation.Several researches have been developed to overcome these difficulties in the WCIP method
This paper proposes a hybrid full-wave analysis using Finite-Difference Time-Domain (FDTD) and Wave Concept Iterative Process (WCIP) methods, developed to analyze locally arbitrarily shaped microwave structures and Multilayer Planar structure
An interpolation scheme is proposed for communicating between the FDTD fields and WCIP wave, which will not require the effort of fitting the WCIP mesh to the FDTD cells in the interface region
Summary
The WCIP method is a widely used numerical technique for characterizing various electromagnetic problems. The effort spent by the researches to develop the WCIP method is restricted to study the homogeneous layers [1]. Hybrid methods, which combine the desirable features of two or more different techniques, are developed to analyze complex electromagnetic problems that cannot be resolved conveniently, and/or accurately, by using them individually [5]. This paper proposes a new hybrid approach by introducing an interpolation scheme for communication between the FDTD field and the WCIP wave in the interface region. This approach employs a combination of Fourier transformation and iteration process, and exchanges information on the field values, back and forth, between the FDTD sub problem and the WCIP region. The comparison between the scattering parameter results obtained with the proposed hybrid method, and FDTD stair casing data verifies the accuracy of this analysis
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