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An alternating-direction implicit finite-difference time-domain (FDTD) algorithm is applied to the full wave analysis of microwave integrated circuit devices. A 3-D multidomain method is developed in nonorthogonal coordinates. Nonorthogonal grids are only used for the anomalistic regions of a complex structure, whereas the standard FDTD lattice is used for the other regions. By using the Jacobian...
In this work, the unconditional stability of the ADI-FDTD method in lossy media has been proven in our approach. The numerical dispersion and stability characteristics of the ADI- FDTD method in lossy media are analyzed. The dispersion analysis actually has a more general meaning, which includes the investigations of both the numerical loss and numerical dispersion, since the propagation constant...
This paper has introduced the NADI-FDTD scheme for generalized nonorthogonal coordinates. Like the ADI-FDTD method, which is free from CFL condition restraint, the proposed scheme requires less CPU time and memory. Since the nonorthogonal gridding can model the curved surface accurately, the proposed method is computationally very efficient for complex structures. Numerical simulations will show that...
Three-dimensional finite-difference time-domain (FDTD) and pseudospectral time-domain (PSTD) algorithms, with perfectly matched layer absorbing boundary condition, are presented for analysis of the newly designed W-band linear tapered slot antenna on rectangular-grooved silicon substrate. Compared to its ungrooved version, the W-band coplanar-waveguide-fed antenna shows significantly improved endfire...
This paper illustrates the application of the alternating direction implicit (ADI) pseudospectral time-domain (PSTD) simulator to full-wave analyzing of dielectric resonator antennas (DRA's). The multi-mode DRA's have been investigated, and the multidomain strategy is employed to allow for a flexible treatment of internal inhomogeneities. Numerical results demonstrate the unconditional stability and...
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