Post-Simulation Data Analysis

As a time domain simulation method; FDTD can get all the relevant spectral response with a single simulation. To get the spectral response, you need to use the DFT, FFT, and Analysis. Discretized Fourier Transform gets a single wavelength response from a time series. where s(n) are the time domain response, N is the number…

For the z-direction propagation wave. The total power in x-y plane can be divided into two power values: x-direction polarized z-direction propagation power (Pz-x) and y-direction polarized z-direction propagation power (Pz-y). The corresponding formulas are: x-polarization power y-polarixation power Total power where the cap dot indicates the complex value that comes from the DFT calculation, and…

Fraunhofer approximation Narrow angle far-field transform being used in OptiFDTD is based on the Fraunhofer approximation: At a large distance d, the far field position can be expressed by the far field angle, Where the x-directional angle (θx) is the angle between the original yz-plane and the shortest straight line connecting the point and the Y…

Consider figure 21, which depicts an observation point in the far field many wavelengths away from the near field path . In this case, the Far Field can be identified as: for TE simulation and for TM simulation. Then the bistatic radar cross section (RCS) in two dimension can be defined as: Figure 23: Geometry…