The Finite Difference Time Domain simulation creates a three dimensional grid of the circuit and uses Maxwell’s equations to simulate the circuit in the time domain and display the output as scattering parameters in the frequency domain. This method is time consuming but more realistic in its output.
A 4GHz high pass filter design using the Gapher Filter design window and simulated using scattering parameters.
With just one click in the FDTD menu the design is converted into the FDTD grid.
And the circuit is simulated, measuring the scattering parameters as the simulation progresses.