Search found 1438 matches

by thorsten
Thu 24 Dec 2020, 10:35
Forum: Usage
Topic: Helix antenna with lossy wire
Replies: 2
Views: 1801

Re: Helix antenna with lossy wire

AddCurve is only the primitive (shape). In this case a infinite thin metal wire. What you need to look at is the material definition for it. Adding to this losses is not simple and I'm at the moment unsure if the conducting sheet material can handle curves. But you should give it a try... Otherwise ...
by thorsten
Thu 24 Dec 2020, 10:30
Forum: Usage
Topic: Simulation of Patch antenna with SMA connector
Replies: 2
Views: 1779

Re: Simulation of Patch antenna with SMA connector

If you get a good CAD model including all material parameters, it should be possible. The question that remains is what you would gain from it? I personally found that the simple lumped port is a good approximation of the inner conductor of an SMA connector and measurements tend to be in good agreem...
by thorsten
Sun 13 Dec 2020, 10:40
Forum: Usage
Topic: Patch array antenna model
Replies: 5
Views: 6560

Re: Patch array antenna model

Yes very interesting, thanks for the link!
by thorsten
Wed 09 Dec 2020, 23:20
Forum: Usage
Topic: A Luneburg Lens fed by an aperture patch antenna
Replies: 6
Views: 3363

Re: A Luneburg Lens fed by an aperture patch antenna

Not sure if this is your question, but you can append this transforms to any primitive in openEMS (not only a box). Additionally you can use the priority concept to define a sphere and use a box to cut off half of it by using a higher priority and an "air" material. And by rotating the box you can c...
by thorsten
Sun 06 Dec 2020, 18:40
Forum: Usage
Topic: A Luneburg Lens fed by an aperture patch antenna
Replies: 6
Views: 3363

Re: A Luneburg Lens fed by an aperture patch antenna

Hi, good that you found the issue. By the way, do you know that openEMS supports coordinate dependent definitions? Maybe useful for your case? See "help SetMaterialWeight", but from the example: CSX = AddMaterial(CSX, 'material'); CSX = SetMaterialProperty(CSX, 'material', 'Epsilon', 1); CSX = SetMa...
by thorsten
Sat 05 Dec 2020, 11:50
Forum: Usage
Topic: Recover output voltage waveform wrong amplitude
Replies: 2
Views: 1722

Re: Recover output voltage waveform wrong amplitude

If you compare voltages of different simulations you need indeed normalize to "et" which is the excitation signal as this may have different amplitudes. Normally you don't need to do this if you divide voltages of the same simulation as this cancels out. But if you want to look at plain voltages or ...
by thorsten
Sun 22 Nov 2020, 20:20
Forum: Development
Topic: Accelerate initialization of many excitations
Replies: 2
Views: 4252

Re: Accelerate initialization of many excitations

I think I was able to speedup the setup quit a lot. Please give the latest build a try.

I certainly need to make sure this has no unwanted side effect as this is a change in a dangerous place...

regards
Thorsten
by thorsten
Thu 22 Oct 2020, 20:14
Forum: Usage
Topic: Frequency Selective Surface
Replies: 4
Views: 2770

Re: Frequency Selective Surface

Yes you can tries MSL lines, or go simpler (but more manual) and use lumped ports at the end...

br
Thorsten
by thorsten
Thu 22 Oct 2020, 20:12
Forum: Install
Topic: Linux Server Installation
Replies: 4
Views: 3343

Re: Linux Server Installation: Error in CSXCAD/CSPrimPolyhedronReader.cpp

Both seems to be related to vtk9. vtk 9 is very new and I have never tried to build against version 9. I guess I will have to adapt to the new vtk as for many major new version before. I can only assume you build vtk yourself? I recommend to just use the distribution versions or at least try an olde...
by thorsten
Wed 21 Oct 2020, 08:20
Forum: Usage
Topic: Frequency Selective Surface
Replies: 4
Views: 2770

Re: Frequency Selective Surface

Yes this looks very much like a polygon...

br
Thorsten