Search found 1319 matches

by thorsten
Sun 21 Jul 2019, 16:44
Forum: Usage
Topic: Modelling rectenna using FDTD
Replies: 2
Views: 17

Re: Modelling rectenna using FDTD

Are you sure you are allowed to publish the paper here? I don't think that you are the copyright holder to that paper? Please check it and if you are not sure, delete your attachment or I will have to do it. Further I recommend you try to model it with openEMS, this way you can find out if it is pos...
by thorsten
Sun 21 Jul 2019, 16:39
Forum: Usage
Topic: Antenna Gain and Far Field Results for Complex Port
Replies: 10
Views: 162

Re: Antenna Gain and Far Field Results for Complex Port

Sounds good, going back to the basic electric fields is usually never a bad idea, it just requires more calculating and figuring out...
by thorsten
Sun 21 Jul 2019, 16:36
Forum: Usage
Topic: Excitation of higher modes (other than TE11) in cylindrical waveguides
Replies: 1
Views: 47

Re: Excitation of higher modes (other than TE11) in cylindrical waveguides

Hi, I never used anything higher than TE11 in circular waveguides, thus it might be possible that there is an error in the calculations. Feel free to check it. TEnm modes, only Ez should be zero but not Hz (even for TE11 mode). Only the tangential fields are excited , that does not mean normal compo...
by thorsten
Sat 13 Jul 2019, 12:27
Forum: Usage
Topic: Horn Antenna Coupling
Replies: 4
Views: 75

Re: Horn Antenna Coupling

it means that it is not possible to get a better estimate than -30dB You are aware that this is already a very small value right? Everything below something like this is absolute irrelevant as in nature the smallest imperfection or unknown would have significant more influence that that already. Fi...
by thorsten
Sat 13 Jul 2019, 12:20
Forum: Usage
Topic: Antenna Gain and Far Field Results for Complex Port
Replies: 10
Views: 162

Re: Antenna Gain and Far Field Results for Complex Port

What kind of "antenna" is this supposed to be with a gain of -30? Any peace of wire should have more gain than that.. Are you sure this is what you expect? Furthermore with this little energy (gain) all you will measure or simulate is very sensitive to everything, e.g. like the feeding size, positio...
by thorsten
Wed 10 Jul 2019, 21:26
Forum: Usage
Topic: Antenna Gain and Far Field Results for Complex Port
Replies: 10
Views: 162

Re: Antenna Gain and Far Field Results for Complex Port

I think you only need to calculate the antenna efficiency correctly. That is without the port mismatch. If you do this correctly you will get only the efficiency based on the power actually accepted by the antenna. If you have that value, you only need to add the return losses (matching losses) from...
by thorsten
Wed 10 Jul 2019, 21:08
Forum: Usage
Topic: Horn Antenna Coupling
Replies: 4
Views: 75

Re: Horn Antenna Coupling

The first question is: how much can I trust this result? Well from the model that sound reasonable as the PML is very good at absorbing fields, but this is of course not to be expected from reality. the radiation pattern in the H-plane does not seem to match the datasheet figures How did you calcul...
by thorsten
Wed 10 Jul 2019, 20:54
Forum: Usage
Topic: Electric Field between two electrodes
Replies: 2
Views: 96

Re: Electric Field between two electrodes

If the picture show the mesh than it is very coarse. And the question is what a thickness >0 means. If it is very thin compared to the rest of the mesh it will indeed reduce your timestep significantly. Please remember that the (electrically) smallest cells determine the timestep and thus to a large...
by thorsten
Wed 10 Jul 2019, 20:50
Forum: Usage
Topic: Different S parameters for the same shape of antenna
Replies: 2
Views: 86

Re: Different S parameters for the same shape of antenna

I get lots of warnings like these: Operator::Calc_LumpedElements(): Warning: Lumped Element with zero (snapped) length is invalid! skipping. If you get these too, than these are the problem. I did not have a closer look at your script, but either your mesh is not suitable for this lumped elements (p...
by thorsten
Sat 29 Jun 2019, 17:28
Forum: Usage
Topic: Batches - how to distribute and manage for best performance
Replies: 2
Views: 175

Re: Batches - how to distribute and manage for best performance

Do I have a problem with getting multithreading going? Or is 1 thread expected to be fastest with the kind of HW such as the T3610? openEMS is not really good at fully utilizing many cores, but only 1 is a bit low. But it depends on the simulation size too. Large simulations might work better with ...