Search found 17 matches

by HexAndFlex
Sun 29 May 2022, 11:40
Forum: Usage
Topic: AppCSXCAD does not show object under Windows OS
Replies: 2
Views: 1218

Re: AppCSXCAD does not show object under Windows OS

There is a lightbulb icon next to each primative. You should be able to hide the bounding box.

That said, on all the windows machines I use this is hidden by default.
by HexAndFlex
Sat 28 May 2022, 09:04
Forum: Usage
Topic: Getting openEMS to execute more quickly
Replies: 2
Views: 1338

Re: Getting openEMS to execute more quickly

I run it on a 10core(20thread) i9 machine (gen 9). OpenEMS isn't great at utilising all the cores and I get faster results limiting it to about 8 threads. I believe it's a memory bandwidth problem. Hence my best guess for an ideal machine. 1. Lots of cache memory 2. Fastest memory you can get(with m...
by HexAndFlex
Wed 08 Dec 2021, 22:25
Forum: Usage
Topic: Electrically Small Antenna - S11 > 0
Replies: 4
Views: 4404

Re: Electrically Small Antenna - S11 > 0

I think this is just quantisation noise. The values are so small the limited precision of the digital math may be having an effect.
by HexAndFlex
Mon 06 Dec 2021, 22:58
Forum: Usage
Topic: Electrically Small Antenna - S11 > 0
Replies: 4
Views: 4404

Re: Electrically Small Antenna - S11 > 0

While I haven't looked in detail at this. For the small size of the antenna and the huge frequency range you are trying to simulate, I am not surprised that it it taking many hours, perhaps hundreds of hours to simulate. Hopefully you are already aware of the limitations of electrically small antenn...
by HexAndFlex
Tue 25 May 2021, 05:18
Forum: Usage
Topic: Use of multithreading
Replies: 4
Views: 6914

Re: Use of multithreading

As Thorsten says, there is an optimum number of threads. I run this on a 10core i9 processor. But in general, it normally runs faster if I limit the threads to about 4. Other speed sup tricks include... Lowering the stopping criteria. You have it set to -40db. You might be able to get away with anyt...
by HexAndFlex
Tue 25 May 2021, 05:08
Forum: Usage
Topic: How to add my own model to openems
Replies: 5
Views: 7260

Re: How to add my own model to openems

The software can import STL files. Most 3D software can export to that format.

The source code is on the openEMS GitHub.
by HexAndFlex
Mon 04 Jan 2021, 17:15
Forum: Usage
Topic: Interfaces to openEMS
Replies: 10
Views: 15316

Re: Interfaces to openEMS

I would say a big advantage to Octave is being able the availability of example code and ease of plotting results. Matlibplot under python is very similar to Octave plotting, so that would help if you go Python.
by HexAndFlex
Mon 16 Nov 2020, 14:08
Forum: Usage
Topic: GPS antenna with zero and 90 degree feed ports
Replies: 1
Views: 4598

Re: GPS antenna with zero and 90 degree feed ports

I think I have it working. The answer was buried in the forum, but needed an extra bit of digging to work out how to add a delay to a lumped port. The simplest way is to add a Delay as shown below start = [feed.pos 0 0]; stop = [feed.pos 0 substrate.thickness]; [CSX port] = AddLumpedPort(CSX, 5 ,1 ,...
by HexAndFlex
Fri 13 Nov 2020, 08:16
Forum: Usage
Topic: GPS antenna with zero and 90 degree feed ports
Replies: 1
Views: 4598

GPS antenna with zero and 90 degree feed ports

Hi all, I need to do some work modelling a GPS antenna(RHCP patch). Physically, this will be fed by a 90 degree hybrid to achieve the desired circular polarization. To simplify and speed up the simulation, I don't want to try and model and simulate the hybrid. I would like to excite my antenna via 2...
by HexAndFlex
Thu 20 Aug 2020, 10:08
Forum: Usage
Topic: FDTD Matrix
Replies: 4
Views: 8694

Re: FDTD Matrix

You will need to use paraView to visualise. Also, as the material is a volumetric solid, you will probably need to do some section cuts of the data to see inside.