Search found 14 matches

by jschall
Thu 15 Feb 2018, 05:41
Forum: Usage
Topic: modelling transceiver module with chip antenna
Replies: 0
Views: 3694

modelling transceiver module with chip antenna

Hello, I have some questions about modeling this transceiver module with integrated chip antenna - see attached picture. The transceiver module's model number is DWM1000, manufactured by Decawave. Datasheets are available online. The chip antenna's model number is ACS5200HFAUWB, manufactured by Part...
by jschall
Wed 10 Jan 2018, 03:38
Forum: Usage
Topic: optimizatio
Replies: 7
Views: 5413

Re: optimizatio

Hi there, I am using a python module called Blackbox to perform optimization. OpenEMS is called via oct2py, and Dask.distributed is used to manage multiprocessing across a cluster of computers. It works well, but it would be nice if it could fetch statically linked Octave and OpenEMS binaries so tha...
by jschall
Wed 10 Jan 2018, 02:41
Forum: Usage
Topic: meshing a helical antenna
Replies: 2
Views: 1833

Re: meshing a helical antenna

Also, can I save CPU cycles by using a PEC boundary condition for the ground plane?
by jschall
Wed 10 Jan 2018, 02:17
Forum: Usage
Topic: meshing a helical antenna
Replies: 2
Views: 1833

meshing a helical antenna

Hello, I've noticed that I get simulation results that are quite dramatically different depending on how fine my mesh is. The s11 result is especially sensitive to meshing. Are there any recommendations for modeling and meshing a helical antenna for maximum accuracy? Specific questions listed below:...
by jschall
Tue 09 Jan 2018, 05:15
Forum: Usage
Topic: Computing gain?
Replies: 6
Views: 3094

Re: Computing gain?

Oh, I was misunderstanding the ordered rotations. I see what's going on now.
by jschall
Tue 09 Jan 2018, 04:06
Forum: Usage
Topic: Computing gain?
Replies: 6
Views: 3094

Re: Computing gain?

Here's with 5 angles per axis: >> 4*pi*nf2ff.P_rad{1} ./ port.P_inc(1) ans = 0.261604 0.038037 0.227371 0.397133 0.265923 1.196041 0.861260 1.710555 2.246776 1.415381 7.462236 7.462236 7.462236 7.462236 7.462236 1.415381 1.263325 2.457515 2.236010 1.196041 0.265923 0.038022 0.275523 0.544538 0.261604
by jschall
Tue 09 Jan 2018, 03:51
Forum: Usage
Topic: Computing gain?
Replies: 6
Views: 3094

Re: Computing gain?

FYI: using octave.
by jschall
Tue 09 Jan 2018, 03:38
Forum: Usage
Topic: Computing gain?
Replies: 6
Views: 3094

Re: Computing gain?

So, looks like there are problems with the values from nf2ff: >> nf2ff_90deg.P_rad{2} ans = 8.2857e-30 9.6878e-30 1.0043e-29 2.7166e-28 2.7166e-28 2.7166e-28 1.0043e-29 9.5362e-30 8.2857e-30 >> nf2ff_0deg.P_rad{2} ans = 9.5281e-30 8.2830e-30 9.6836e-30 2.7162e-28 2.7162e-28 2.7162e-28 9.6836e-30 1.0...
by jschall
Tue 09 Jan 2018, 03:16
Forum: Usage
Topic: Computing gain?
Replies: 6
Views: 3094

Re: Computing gain?

Ok, so that was giving me a result that looked like this (nf2ff called with 3 angles per axis): 0.025271 0.033528 0.112766 6.299631 6.299631 6.299631 0.112766 0.087893 0.025271 That looked odd to me, so I rotated the antenna structures 90 degrees without changing anything else. The result was: 0.087...
by jschall
Mon 08 Jan 2018, 06:44
Forum: Usage
Topic: Computing gain?
Replies: 6
Views: 3094

Computing gain?

Based on wikipedia and some code in the helical antenna tutorial, I came up with this equation: rhcp_gain = 4*pi*(abs(nf2ff.E_cprh{1}).^2 ./ abs(nf2ff.E_norm{1}).^2 .* nf2ff.P_rad{1}) ./ port.P_inc % Don't copy me, I am totally unverified Is this correct for computing an antenna's RHCP gain over a r...