Search found 15 matches

by HexAndFlex
Wed 08 Dec 2021, 22:25
Forum: Usage
Topic: Electrically Small Antenna - S11 > 0
Replies: 4
Views: 933

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: 933

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: 2960

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: 3209

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: 8914

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: 2690

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: 2690

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: 5573

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.
by HexAndFlex
Tue 18 Aug 2020, 09:46
Forum: Usage
Topic: FDTD Matrix
Replies: 4
Views: 5573

Re: FDTD Matrix

You can view the discretized model using the Debug PEC option. https://openems.de/index.php/Model_Visualization.html There is a similar option for exporting dielectric materials. I can't find it in the online docs, but if you explore the runOpenEMS function in MATLAB the info there. Both export data...
by HexAndFlex
Sat 13 Jun 2020, 13:21
Forum: Install
Topic: openEMS_x64_current.zip was not found on this server.
Replies: 1
Views: 4334

Re: openEMS_x64_current.zip was not found on this server.

Got it. Seems like the link from this page is wrong.

https://openems.de/index.php/OpenEMS#Installation

This link from the OpenEMS home page works.

https://openems.de/download/win64/openE ... 0.0.35.zip