Search found 1353 matches

by thorsten
Mon 06 Jan 2020, 23:03
Forum: Usage
Topic: Problem with local MPI
Replies: 43
Views: 25071

Re: Problem with local MPI

The changes made back then are still there and not much was changed in recent years on this front. I do not see an immediate reason or problem.
What nf2ff files are being generated by the MPI openEMS version? Do they not exist or are they invalid?
by thorsten
Sat 28 Dec 2019, 11:14
Forum: Usage
Topic: Compute characteristic impedance from voltage and current probes and python interface
Replies: 2
Views: 101

Re: Compute characteristic impedance from voltage and current probes and python interface

Well in ports.py is a class calles "UI_data" that handels with U/I (voltages, currents) data and the DFT. As you said usually the ports handle all this calculations (and even probe creations). But back to your question. What sense does it make to calculate U/I in time domain? I currently do not see ...
by thorsten
Wed 04 Dec 2019, 21:31
Forum: Install
Topic: File libvtk5-qt4-dv
Replies: 2
Views: 719

Re: File libvtk5-qt4-dv

Yeah, qt4 and vtk5 are out of date. Just use the latest qt and vtk. Should just run fine...
I really need to update this infos. Trouble is I do not use Ubuntu anymore...

regards
Thorsten
by thorsten
Sun 01 Dec 2019, 17:05
Forum: Usage
Topic: Circular wave guide port in cylindrical coordinates, oblique propagation
Replies: 3
Views: 515

Re: Circular wave guide port in cylindrical coordinates, oblique propagation

What you try to do looks complicated and I see a lot of issues. First I don't think you should use cylindrical coordinates. If you want to have a perpendicular waveguide you loose any gain but keep all the disadvantages of this mesh type. Secondly your excitation is inside/behind the PML? regards Th...
by thorsten
Tue 26 Nov 2019, 22:36
Forum: Usage
Topic: PCB Antenna Simulation
Replies: 6
Views: 1186

Re: PCB Antenna Simulation

Maybe use 800MHz (800e6) as fc, that should give a nice short pulse. A feed must connect two metal signal layers. If it is on top of one it may be just short-circuited or at least unable to create a connection between ground and your antenna. As far as I see it, currently is your antenna not connect...
by thorsten
Tue 26 Nov 2019, 22:18
Forum: Usage
Topic: PCB Antenna Simulation
Replies: 6
Views: 1186

Re: PCB Antenna Simulation

openEMS::SetupFDTD: Warning, the timestep seems to be very small --> long simulation. Check your mesh!? Excitation signal length is: 100000 timesteps (2.43824e-08s) Max. number of timesteps: 100000 ( --> 1 * Excitation signal length) Well openEMS agrees: your excitation is even longer than your req...
by thorsten
Tue 26 Nov 2019, 22:11
Forum: Usage
Topic: PCB Antenna Simulation
Replies: 6
Views: 1186

Re: PCB Antenna Simulation

Well first, it looks like your feed is on top of the feed line instead of between the feed line and the ground?
Secondly using a pulse with a width of only 1 MHz is very narrow and thus takes a very long time to simulate.
I recommend using a large pulse bandwidth (short pulse)
by thorsten
Sat 02 Nov 2019, 15:17
Forum: Usage
Topic: Symmetry planes for horn antenna
Replies: 3
Views: 865

Re: Symmetry planes for horn antenna

Well I do not see an obvious problem. (except the missing mirror for the 3D far fields, but that does not change the cut planes) I'm running it now, but it takes a while. What you could try is to run the non-mirrored simulation, but with the cut nf2ff recording and apply the mirror then. This way sh...
by thorsten
Sat 02 Nov 2019, 14:51
Forum: Usage
Topic: efficiency issues with slots
Replies: 1
Views: 526

Re: efficiency issues with slots

Finding problems like this may be hard to find indeed. Try the "--debug-PEC" option to see what the parts look like after meshing...
by thorsten
Sat 02 Nov 2019, 14:50
Forum: Usage
Topic: Lingering fields in coax simulation
Replies: 1
Views: 467

Re: Lingering fields in coax simulation

Looks like static charges/currents that cannot go anywhere. Solutions/workarounds: 1) Make the model more realistic by adding losses (which should affect the DC parts too) 2) Try to use a narrower excitation pulse and exclude the DC (low frequency) range, downside: longer excitation and possibly lon...