Finite Difference Time Domain Simulator Case Study
The simulations were accomplished using Finite Difference Time Domain Simulator (FDTD Simulator) based on the Finite Difference Time Domain Method.
FDTD Simulator is sophisticated simulator and can take a significant amount of time to learn the complex features and it can run on a variety of operating systems. The primary advantage of FDTD over other full-wave models is that, FDTD being a time domain method allows broadband analysis of the antenna by Gaussian pulse excitation. The antenna characteristics over a wide frequency range can be obtained by taking the Fourier transform of the FDTD simulation results obtained when a wideband Gaussian pulse is used as an excitation.
4.1 FINITE DIFFERENCE TIME DOMAIN METHOD
Finite-difference time-domain …show more content…
The computational domain is simply the physical region over which the simulation will be performed. The E and H fields are determined at every point in space within that computational domain. The material of each cell within the computational domain must be specified. Typically, the material is either free-space (air), metal, or dielectric. Any material can be used as long as the permeability, permittivity, and conductivity are specified.
The permittivity of dispersive materials in tabular form cannot be directly substituted into the FDTD scheme. Instead, it can be approximated using multiple Debye, Drude, Lorentz or critical point terms. This approximation can be obtained using open fitting programs and does not necessarily have physical meaning.
Once the computational domain and the grid materials are established, a source is specified. The source can be current on a wire, applied electric field or impinging plane wave. In the last case FDTD can be used to simulate light scattering from arbitrary shaped objects, planar periodic structures at various incident angles, and photonic band structure of infinite periodic structures. Since the E and H fields are determined directly, the output of the simulation is usually the E or H field at a point or a series of points within the computational domain. The simulation evolves the E and H fields forward in time. …show more content…
Data processing may also occur while the simulation is ongoing. While the FDTD technique computes electromagnetic fields within a compact spatial region, scattered and/or radiated far fields can be obtained via near-to-far-field transformations.
4.3 SIMULATION MODES ANALYSIS
DEFINE PORTS
The following calculation of S-parameters requires the definition of ports through which the energy enters and leaves the structure. This can be done by simply selecting the corresponding faces before entering the ports dialog box. Selecting either Waveguide port or discrete port depends on feeding and structure of the antenna.
DEFINE BOUNDARY AND SYMMETRY CONDITIONS
The simulation of this structure will only be performed within the bounding box of the structure. You may, however, specify certain boundary conditions for each plane (Xmin/Xmax/Ymin/Ymax/Zmin/Zmax) of the bounding box. The boundary conditions are specified in a dialog box which can be opened by choosing Solve - > Boundary Conditions from the main
FDTD Simulator is sophisticated simulator and can take a significant amount of time to learn the complex features and it can run on a variety of operating systems. The primary advantage of FDTD over other full-wave models is that, FDTD being a time domain method allows broadband analysis of the antenna by Gaussian pulse excitation. The antenna characteristics over a wide frequency range can be obtained by taking the Fourier transform of the FDTD simulation results obtained when a wideband Gaussian pulse is used as an excitation.
4.1 FINITE DIFFERENCE TIME DOMAIN METHOD
Finite-difference time-domain …show more content…
The computational domain is simply the physical region over which the simulation will be performed. The E and H fields are determined at every point in space within that computational domain. The material of each cell within the computational domain must be specified. Typically, the material is either free-space (air), metal, or dielectric. Any material can be used as long as the permeability, permittivity, and conductivity are specified.
The permittivity of dispersive materials in tabular form cannot be directly substituted into the FDTD scheme. Instead, it can be approximated using multiple Debye, Drude, Lorentz or critical point terms. This approximation can be obtained using open fitting programs and does not necessarily have physical meaning.
Once the computational domain and the grid materials are established, a source is specified. The source can be current on a wire, applied electric field or impinging plane wave. In the last case FDTD can be used to simulate light scattering from arbitrary shaped objects, planar periodic structures at various incident angles, and photonic band structure of infinite periodic structures. Since the E and H fields are determined directly, the output of the simulation is usually the E or H field at a point or a series of points within the computational domain. The simulation evolves the E and H fields forward in time. …show more content…
Data processing may also occur while the simulation is ongoing. While the FDTD technique computes electromagnetic fields within a compact spatial region, scattered and/or radiated far fields can be obtained via near-to-far-field transformations.
4.3 SIMULATION MODES ANALYSIS
DEFINE PORTS
The following calculation of S-parameters requires the definition of ports through which the energy enters and leaves the structure. This can be done by simply selecting the corresponding faces before entering the ports dialog box. Selecting either Waveguide port or discrete port depends on feeding and structure of the antenna.
DEFINE BOUNDARY AND SYMMETRY CONDITIONS
The simulation of this structure will only be performed within the bounding box of the structure. You may, however, specify certain boundary conditions for each plane (Xmin/Xmax/Ymin/Ymax/Zmin/Zmax) of the bounding box. The boundary conditions are specified in a dialog box which can be opened by choosing Solve - > Boundary Conditions from the main