Search found 76 matches

by PaulUK
Sat 20 Jun 2020, 09:49
Forum: Usage
Topic: Corrugated Horn Antenna Tutorial for openEMS
Replies: 6
Views: 4292

Re: Corrugated Horn Antenna Tutorial for openEMS

Hello Paul Thanks, then it is clear. I found a typo in the middle of page 36. "-wgl-10 is the location" -> -wgl+10 Here it is correct mesh.z = [-wgl-lambda_max-9 -wgl-1 -wgl -wgl+10 0 len(1:2:z_number) length+2*lambda_max+9 ]; It is indeed +10 not -10. Thank you for pointing that out. That's anothe...
by PaulUK
Wed 17 Jun 2020, 17:50
Forum: Usage
Topic: Corrugated Horn Antenna Tutorial for openEMS
Replies: 6
Views: 4292

Re: Corrugated Horn Antenna Tutorial for openEMS

or should the "9" be inside the brackets because we speak about 9 cells/layer for MPL_8 and not about 9 mm. mesh.x = [( -a_offset(end-9) -lambda_max) -radmsh(1:4:end) 0 radmsh(1:4:end) ( a_offset(end+9) +lambda_max)]; Hello Gerald, I had a look at this and yes, the "9" would have been distance rath...
by PaulUK
Mon 15 Jun 2020, 17:56
Forum: Usage
Topic: Corrugated Horn Antenna Tutorial for openEMS
Replies: 6
Views: 4292

Re: Corrugated Horn Antenna Tutorial for openEMS

Thanks for pointing this out. It may be that the 9 can be left out all together, but I will check this once I get some time and get the computer set up again (I'm setting up after moving at the moment). It may well be an error but if so, it should have no impact on the meshing where it's important. ...
by PaulUK
Mon 15 Jun 2020, 09:23
Forum: Usage
Topic: Problem with phase accuracy in waveguide polarisers
Replies: 4
Views: 267

Re: Problem with phase accuracy in waveguide polarisers

the answer is in your question. circular waveguide requires non-orthogonal meshing I've used the rectangular mesh with circular waveguide before, but I apply the appropriate circular waveguide port and had no problems. I didn't use the cylindrical mesh because the slots in the waveguide walls of th...
by PaulUK
Mon 15 Jun 2020, 09:18
Forum: Usage
Topic: Problem with phase accuracy in waveguide polarisers
Replies: 4
Views: 267

Re: Problem with phase accuracy in waveguide polarisers

I shall post the examples that I have done and show their results either later or within a few days. I've just moved to Germany from the UK so things are a bit of a mess at the moment. As soon as I get my computer setup I will post what I have. I previously did these simulations with CST and HFSS an...
by PaulUK
Sun 14 Jun 2020, 13:01
Forum: Usage
Topic: Problem with phase accuracy in waveguide polarisers
Replies: 4
Views: 267

Problem with phase accuracy in waveguide polarisers

Does anyone know why it requires an extremely fine mesh to get sensible results when simulating various waveguide polarisers? I'll post some examples when I get chance bit for square cross section corrugated polarisers I require about 80 to 100 cells per wavelength. For circular cross section wavegu...
by PaulUK
Wed 22 Jan 2020, 11:01
Forum: Usage
Topic: Problems calculating characteristic impedance for Microstrip line
Replies: 11
Views: 2864

Re: Problems calculating characteristic impedance for Microstrip line

When you setup your mesh, do you have mesh lines on the edge of the metal strip or are you following the 1/3 2/3 rule? Although initially counter intuitive, you should not have mesh lines on the edge of planar tracks but have one line 1/3 of the mesh resolution inside the track and a mesh line 2/3 o...
by PaulUK
Sun 19 Jan 2020, 23:08
Forum: Usage
Topic: Problems calculating characteristic impedance for Microstrip line
Replies: 11
Views: 2864

Re: Problems calculating characteristic impedance for Microstrip line

Im not sure if this helps but if your track geometry is known and you store it in a variable, you can use that variable in the mesh definition and port definition that comes after the mesh and geometry setup. That way the port length should always correspond to the height of your track.

Paul
by PaulUK
Mon 02 Dec 2019, 01:58
Forum: Usage
Topic: Corrugated Horn Antenna Tutorial for openEMS
Replies: 6
Views: 4292

Corrugated Horn Antenna Tutorial for openEMS

I have written a tutorial called, A Comprehensive Corrugated Horn Generator and Simulation with openEMS. It is based on the article "Design of Corrugated Horns: A Primer" that appeared in the IEEE Antennas and Propagation Magazine in 2005 and can be found on the internet. References included in the ...
by PaulUK
Fri 29 Nov 2019, 14:32
Forum: Usage
Topic: [solved] Very basic but can't get it to work: simple MSL sim does not converge
Replies: 6
Views: 3620

Re: [solved] Very basic but can't get it to work: simple MSL sim does not converge

This might be a silly question but was the animated gif made from within ParaView?