FDTD multimode characterization of waveguide devices using absorbing boundary conditions for propagating and evanescent modes

Implementation of Absorbing Boundary Conditions Based on the Second-Order One-Way Wave Equation in the LOD- and the ADI-FDTD Methods

“…In the second example, we consider a WR75 guide propagating the mode in the frequency band [10][11][12][13][14][15] GHz. The width of this waveguide is mm.…”

“…This letter presents a successful implementation of secondorder one-way wave-equation ABC in the LOD-and the ADI-FDTD methods. The considered ABC is based on the Higdon second-order absorbing operator [10], [11]. This operator is discretized by applying the same FD scheme as when it is used with the conventional FDTD method.…”

An FDFD eigenvalue formulation for computing port solutions in FDTD simulators

“…For homogeneous rectangular waveguide ports, the propagation constants are usually calculated directly from the numerical dispersion equation and the mode patterns are analytically known [1]. For homogeneous arbitrarily shaped waveguides, cutoff frequencies and mode patterns have been obtained by using the finite-difference frequencydomain (FDFD) method [2].…”

Waveguide Simulation Using the High-Order Symplectic Finite-Difference Time-Domain Scheme

“…As the most standard algorithm, the traditional finite-difference timedomain (FDTD) method [1,2], which is explicit and second-order accurate in both space and time, has been widely applied to modeling and simulation of waveguide structures [3][4][5][6][7][8][9][10][11]. However, the numerical dispersion in the traditional FDTD method leads to less efficiency for solving the closed problems.…”

“…The ε p r,z max for the perfectly matched layer and the modified perfectly matched layer are, respectively, 0 and 5. The total computational region occupies 6 × 12 × 31 grids and the record point is located at (3,6,19). The number of the absorbing boundary layer is 10; the space step is ∆ δ = 0.072 mm; and the Courant-Friedrichs-Levy number is 1.0.…”