I want to extract the material parameters of a noval metamaterial unit cell using s-parameters but I am facing some problem with defining port and boundary condition. The help would be greatly appreciated.Thanks a lot.
To assign boundary conditions you might follow time domain or frequency domain solver. In time domain simply assign x-axis as electric, y- axis as magnetic and z-axis as open add space for TEM mode only.For TE or TM polarization consider frequency domain solver with unit cell boundary conditions and z-axis axis as open add space.
Dear Priyanka,
If you want to simulate the infinite FSS, there' s template in CST and you can use it.
Huangyan
Use open boundaries along Z axis and periodic boundaries along X & Y axes.
Thank you all for reply.
@Dhavan Singh, Sir for this type of boundary assignment, the unit cell should be placed in which plane(xy, yz, or zx)? and is this applicable to complementary structures like CSRR as well? please reply.
Structure is designed along XY plane and z axis is used to assign ports(direction of propagation). For time domain you have to define waveguide port and for frequency domain you don't required to define any port.cst automatically consider it as zmax and zmin and Yes it is same for CSRR.Best of luck for your work.
Aqeel bhai as per my understanding the best way is the combination of periodic boundaries in xy and open (add space) in z as suggested before. I would add that once the analysis is complete, please proceed with the physical definition of entire metasurface. By a plane wave excitation at a distance from the surface, you should be able to record the mag and phase information. Using ideal boundary conditions in cst are sometimes not enough.
Periodic boundary conditions are preferable for simulating an array of a unit cell. If you have analyzed the structure properly then PEC/PMC approach can also give good results but PEC/PMC is the traditional approach.
use
perfect electric with the x-axis
perfect magnetic with the y-axis
open with z-axis
and use two waveguide port for feeding unit cell
how to do plane wave simulation in CST. Like i want a y polarized wave normally incident over a metasurface. Please help me.
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