planar transmission line examples

[PinkMushroom]

To get familiar with meep I'm going to build a basic microstrip model for simulation.

1 does anyone know of some code to give me a starting point ?
2 any gotchas i should be aware of in setting up that type of model (e.g. should I use Mur or ABC ?) ?
3 meep really seems to be oriented around photonics, and yet also seems to be a general FDTD implementation . There isn't any reason why simulating planar transmission line structures would be a problem, is there ?

Thank you!

[tmteryz]

In most cases you should use PML in meep.
for the simulation of microstrip ,you can refer to this tutorial https://meep.readthedocs.io/en/latest/Python_Tutorials/Eigenmode_Source/.
but if the microstrip is made of PEC or lossy metal, maybe you need to develop the function of discrete port by yourself(see #2457).

[manujmg]

Any update on this issue?
@smartalecH what do you mean by injecting an RF mode from an appropriate mode solver?

You would need to create a custom source function to inject an RF signal carrying the mode you are interested but also a mode decomposition/solver custom function. Right?

[smartalecH]

Any update on this issue?

Nope.

You would need to create a custom source function

Meep already has that. See here. You just need to get the right mode profiles from an external solver.

but also a mode decomposition/solver custom function

Sure you could do this in python pretty easily though. Just a mode overlap with the recorded transverse E and H fields.

[manujmg]

@smartalecH But, let's assume we have a 3D simulation with a microstrip along the x axis and a gaussian source in the Y-Z (mp.Ez component) plane (much wider and longer than the microstrip dimensions) simulating an infinitely waveguide connected to the microstrip.

By running a standard simulation and getting the fields at some point in the microstrip (e.g. accumulating the appropriate field Fourier transforms in a flux monitor and getting those with get_fluxes)... couldn't I use those to do the mode decomposition, get the mode profiles and use those profiles with the GaussianBeam3DSource so I excite the microstrip properly?

My real question here would be... how would you extract the S11 Parameter in an scenario like that....

[smartalecH]

Sounds like we're diverging a bit from the main thread. Maybe open a new discussion (with a figure describing your setup, if you can).

[manujmg]

@smartalecH there you have: #2743