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18 Threads found on edaboard.com: Pml Boundary Cst
Hi, I was simulating using C*S*T software and I encounter a message saying "inhomogenous material at pml boundary detected" Could I know what does that mean and how about do I go about solving it? Thanks.
I think you forgot to give the dimension of your pml vaccum box, so people cannot help much! Just put your pml vaccum box at distance lambda/2 (minimum) from the closest microstrip. It's a small box.
2smallcat From my experience HFSS has more reliable and accurate eigenmode solver than cst (especially to calculate something lossy). The fact that you need to specify lowest frequency in HFSS is a plus, because sometimes I need to find high order mode solution and it's not possible to do it precisely with cst (you have to specify - 20-50 m
Hi, everyone. I have some questions about the MWS-cst eigen solver for open-boudary case. From the example of microstrip line eigen simulation sample in cst 2005, the top wall is assigned to PEC boundary instead of open boundary. I am wondering whether it is correct enough for higher-order modes? Since in this case, (...)
Hi to all, I want to get a dispersion diagram of a periodic structure where one side should be radiation boundary.How can I get that with cst or HFSS by using the eigenmode solver that don't support,both, radiation(pml) or open add space boundary? I should use an air box on the top. How sufficiently large and what should (...)
both boundary condtions use pml (perfectly matched layer). The "add space" enlarges the calculation box automatically for antenna problems, i.e. radiation patterns.
All, I am simulating a simple microstrip trace in cst. I am using discrete ports and pml (open + add space) boundary conditions. I notice that S12 does not quite reach 0dB at DC, even with PEC models for the conductors and no dielectric loss. Is there something I should be doing to get S21 -> 0dB? Thanks Ed
Open boundaries: operates like free space – waves can pass this boundary with minimal reflections. Perfectly matched layer (pml) Open add space boundaries: same as Open, but adds some extra space for farfield calculation (automatically adapted to center frequency of desired bandwidth). This option is recommended for an
Hi, in the help is: Open (pml): Operates like free space: waves can pass this boundary with minimal reflections. Note that in case of a unit cell simulation with the general purpose frequency domain solver open boundaries are realized by a Floquet port. Open (add space): Same as Open (pml), but adds some extra space for (...)
I think simulating a semi-infinite substrate that is different from the background (eg vacuum) is trivial since cst automatically recognizes what you want to do. Just set up a finite thickness of the substrate beneath your structure, eg going down to Zmin. In the x and y direction use the unit cell boundary conditions and in z direction use the ope
Hi, I am trying to simulate the propagation of of EM waves through the ground as well as the reflection from the surface. The main problem with the cad software that I used (HFSS, cst, Semcad) is the pml boundary conditions ? They seem to work only for a single background material and not for two half spaces (air/dielectric). One (...)
As ColonelTigh mentioned: You can use any boundary (radiation or pml). If you use pml boundary, the results are more accurate compared to using the radiation boundary. Simulation takes a while longer if you use pml boundary. Since you are using an array of 11 elements, (...)
How are you feeding your structure? Sometimes cst whinges (with cryptic, irrelevant errors) if the excitation ports are too close or touching the calculation boundaries. In particular, make sure your boundaries are set to "open" (i.e. pml) for antenna simulation. If you inadvertently have a "electric" boundary set, cst (...)
Guys, I recommend you MicroStripes for antenna design. TLM time-domain tool (check my reply on HFSS size problem). No more pml crap or fancy boundary conditions needed. The only thing is there is no optimizer available yet but I heard the up-coming version 7 will have one. It really handles electrically large models, I would even
Hallo, I try to simulate the scattering field for a infinite extended dielectric plane using HFSS v.10. I used a airbox with master/slave boundaries (side walls) & pml (top and botton walls) as boundary CONDITION and PLANE WAVE excitation. See also attached hfss-file. The results are not the ones expected. Does anybody have any idea of
What about method of moments software? Despite the fact that less people use them than FEM or FIT/FDTD they are extremely efficient in antenna simulation and don't suffer from any radiation boundary/ pml related problems. By efficient, I mean very fast and employing small amount of memory. For instance, how much would it take to simulate accu
Hello mates, I have a very tricky question for you today: I need to simulate an antenna (loop) inside a pipe full of water. Obviously the antenna has been protected by a proper radome. I need to know the farfield of the overall structure, but a problem occured. Suppose that the plane of the loop is the yx and the pipe's axis is along z. Th
Hi all, i am very glad to be a member in this forum. I also hope i can get knowledge and answers that can possibly help each other. Now i have a problem in an EM model to define the EM power absorbed by a fractal structure. Simulators chosen are HFSS and cst MWS. In both simulation tools, i define a model by sending incident plane wave torward t