totalfieldscatteredfield

Total Field Scattered Field (TFSF) is a numerical technique used in computational electromagnetics to simulate the interaction of electromagnetic waves with complex structures. It is particularly useful for analyzing the scattering and absorption of electromagnetic radiation by objects of arbitrary shape and composition. The TFSF method is an extension of the Total Field Scattered Field (TF/SF) method, which was originally developed for analyzing the scattering of plane waves by perfectly conducting objects.

In the TFSF method, the computational domain is divided into two regions: the total field region and the scattered field region. The total field region is excited by a plane wave, and the scattered field region is used to absorb the outgoing scattered waves. The interface between the two regions is typically located at a distance from the scatterer that is large enough to ensure that the scattered field is negligible in the total field region.

The TFSF method is implemented using the finite-difference time-domain (FDTD) technique, which is a popular numerical method for solving Maxwell's equations. In the FDTD method, the electromagnetic field is discretized in both space and time, and the field values are updated using finite-difference approximations to the spatial and temporal derivatives in Maxwell's equations.

The TFSF method has several advantages over other numerical techniques for analyzing electromagnetic scattering. It is particularly well-suited for analyzing the scattering of electromagnetic waves by complex structures, such as antennas, radar targets, and optical devices. It is also relatively easy to implement and can be used to simulate a wide range of electromagnetic phenomena, including the scattering of polarized waves, the scattering of waves by lossy materials, and the scattering of waves by objects with arbitrary shape and composition.

However, the TFSF method also has some limitations. It can be computationally intensive, particularly for large or complex structures, and it may require a large amount of memory to store the field values. It is also sensitive to the choice of the interface between the total field and scattered field regions, and the accuracy of the results may be affected by the choice of the absorbing boundary conditions used to truncate the computational domain.