where c is the speed of light in the free space.
EM.Ferma's 2D Quasi-Static mode automatically performs the two-step process described above and calculates ε<sub>eff</sub> and Z<sub>0</sub>. So you don't need to modify your structure in the first step.
=== Setting up a Transmission Line Simulation ===
To perform a transmission line simulation, first draw your structure in the project workspace just like a typical 3D structure. Define a "Field Sensor" observable in the Navigation Tree so as to capture the cross section of your structure as your desired transmission line profile.
Next, define a "2D Solution Plane" in the Navigation Tree based on your existing field sensor. When defining the 2D plane, check the box labeled "Perform 2D Quasi-Static Simulation". If an analysis is run with this option checked, the characteristic impedance Z<sub>0</sub>. and effective permittivity ε<sub>eff</sub> will be computed for the corresponding 2D Solution Plane. The results are written to two output data files named "solution_plane_Z0.DAT" and "solution_plane_EpsEff.DAT", respectively, where "solution_plane" is the default name of your 2D plane.
   This output can be found in appropriately-named text files in the project directory upon completion of the simulation. Fields and potentials at the selected 2D plane will still be computed. Many 2D quasistatic quasi-static solutions can be obtained in the same analysis, if for example, when your design contains many types of [[Transmission Lines|transmission lines]].  Quasistatic At the end of a quasi-static analysis , the electric field components and scalar potential at the selected 2D planes will still be computed and can only be performed with a Dirichlet boundary condition with 0V specified on the boundariesvisualized.
For a step-by-step demonstration (including transmission line [[optimization]]), take a look at this video on our YouTube channel: [http://www.youtube.com/watch?v=Iiu9rQf1QI4 EM.CUBE Microstrip Optimization]