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The frequency-dependent finite-difference time-domain (FDTD) method has widely been used to treat dispersive materials, e.g., metal at optical frequencies, semiconductors at THz frequencies, water at microwave frequencies, and so on. Unfortunately, the time step size is restricted by the Courant-Friedrichs-Lewy (CFL) condition even for the frequency-dependent FDTD method. To remove this restriction,...
A dual-band metahelical antenna that has a negative phase constant for the current on the helical arm is realized. A left-handed circularly polarized (CP) wave is obtained within a specific frequency band and a right-handed CP wave is obtained within a different frequency band. The antenna characteristics, including the radiation pattern, gain, and input performance (VSWR) are presented and discussed.
An improved three-dimensional (3-D) locally one-dimensional finite-difference time-domain (LOD-FDTD) method is developed and applied to the wideband analysis of waveguide gratings. First, the formulation is presented, in which dispersion control parameters are introduced to reduce the numerical dispersion error and perfectly matched layers are simply implemented without the field components being...
The finite-difference time-domain method based on the locally one-dimensional scheme (LOD-FDTD) is extended to the analysis of periodic structures. The cyclic matrix problem resulting from the application of the periodic boundary condition to the implicit LOD scheme is efficiently solved with the Sherman-Morrison formula. The analysis of a photonic bandgap structure shows that the numerical results...
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