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1000 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.
HI GROUP! I HAVE DESIGNED ANOTHER VIVALDI ANTENNA BETTER THAN THE ONE THAT I POST YEASTERDAY AND YOU CAN FIND IT ATTACHED. IT IS JUST A TRY AND IT ISN'T THE OPTIMOUS SOLUTION. I HAVE SIMULATE IT WITH MW STUDIO 5 AND EVERYTIME THAT LANCH THE SIMULATION THERE IS PROBLEM ABOUT THE pml boundary AND ABOUT PORT. I HAVE CHOOSE
Hi, I am trying to do a simple simulation in HFSS v10. In the simulation, a plane wave is incident in air(half space) and propagates into a dielectric (half space as well). pml bondaries are needed on both air and dielectric sides. I created the pml boundary automatically but the scattered fields are not right indicating that there are (...)
Hi, I am trying to do a simple simulation in HFSS v10. In the simulation, a plane wave is incident in air(half space) and propagates into a dielectric (half space as well). pml bondaries are needed on both air and dielectric sides. I created the pml boundary automatically but the scattered fields are not right indicating that there are (...)
The "efficiency" of a pml is simply how much energy it absorbs (does not reflect) relative to the energy incident on it. You probably want to study how its efficiency is affected by angle of incidence, background material properties, frequency, etc. While there are many way to set this up, here is one possible recipe. For simplicity I am assum
Not to state the obvious, but you could also go to the HFSS help and search 'pml'. There is a walkthrough... Have Fun
Is pml boundary useful for SAR Calculation in HFSS????????????????????????????????
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 (...)
Does anybody know how to plot far-field radiation pattern when assigned pml boundary in HFSS? Any hints will be appreciated! Thanks in advance! Regards! Edmund
Hi bingjiang99, In simulation of antanna structure specially p@tch antenna analysis converge slowly to the answer per pass. so first, change pass number in analysis setup to about 20 pass. (It's very important) second, if the result is not converge te desired solution enlarge radiation box. third, if this to operation is not enough use PM
Hi, everyone. I have a question about HFSS boundary setting for infinite extended objects. In my project, I am going to simulate the scattering field for a infinite long dielectric cylinder (see attachment). So I set the four side walls as pml, but how do I set for the top and bottom walls? Since HFSS doesn't allow pml (...)
Hi, Is there a minimum distance to place the pml boundary around a dielectric waveguide such that the port solver calculates the field correctly thanks, Adel
Low frequencies and small radiating structures made me thinking about setting up a pml-boundary. This can be set very close to the structure as far as i know. But now I´m wondering if accuracy of calculation is influenced in an unexceptable way... Any ideas? Thanks for your help
Low frequencies and small radiating structures made me thinking about setting up a pml-boundary. This can be set very close to the structure as far as i know. But now I´m wondering if accuracy of calculation is influenced in an unexceptable way... Any ideas? Thanks for your help
hello, I have some problems with my antenna (which is suppose to work as a folded dipole). I am simulating the same structure, firstly with pml boundary conditions. I have a certain resonat frequency and a certain gain. I am simualting the same structure, but with radiation boundaries. I get a different resonant frequency (1 MHz difference) and
hi you should only programm ABC equations. but now all researchers uses pml. snd me un email i you like discussing these point
hi, I am working on RFID tag antennas which are meander line half wave dipole antennas for 866Mhz-960Mhz. I am a bit confuse about using either pml boundry or radiation boundry for simulation that can be more closer to real results. Any suggestions
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 (...)
Hey hi Thanks for ur help guys.. As tallface65 suggested, its almost identical with pml and radiation boundary..for an antenna. But for a simple case of patch antenna pml takes a longer time rather than radiation boundary. When I used the same for multiband antenna pml takes less time compared to radiation (...)
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, (...)
Hi ppl, I'm doing a project on the double ridged horn antenna but I have encounter some problems when assigning the pml on the waveguide section. Can anybody show me how to assigning the pml boundary?
Hi I have problem with getting the S parameter of a rectangular wave guide whose boundaries in x an y direction is pml. there are some tutorials about how to assign pml and they use incident wave excitation , However since I need S parameter I should have 2 ports. Considering a simple air wave guide which ideally should have 1 S21 in frequency d
hi everyone I am simulating PhC structure with line defcts. Can pml be applied for PhC. How does the PBC and pml boundary conditions affect the results. thank you
hi.how are you? i need to help... anyone does have 2D FDTD (finite difference time domain) or FDFD (finite difference frequency domain) matlab code for solving mawxell equations in a dispersive medium ba ABC pml? my antenna has cylindrical configuration with medium dispersive. if you have this code,please help me. i have another question: wha
hi.how are you? i need to help... anyone does have 2D FDTD (finite difference time domain) or FDFD (finite difference frequency domain) matlab code for solving mawxell equations in a dispersive medium ba ABC pml? my antenna has cylindrical configuration with medium dispersive. if you have this code,please help me. i have another question:
Why i have such warning when using pml boundary and how to solve this : pml Setup: pml Material parameters are out of sync with the problem setup and need to be recalculated using the pml Setup Wizard.
:roll: hi,all When i simulate the structure based on the attachment,i can't get the result i need. When i define the excitations,it's said in the manual of HF$$9 that the LUMP port is the proper one,however,When i use 30,20,10 um overlap in my model,the results are not gradual. Then i use the wave port which i can do deembedding,i enlarge the
IE3d is good for determining microstrip antenna's resonance frequency and input impedance, also good for simulating microstrip structure devices,i.e.power divider and coupler. But fail to get wide-angle pattern. If want obtain an accurate pattern plot, use HFSS with pml boundary.
I use HFSS9 to simulate EBG structure.But everytime it tells me that the result can't be converged,and I don't know there's the problem.here's my structure:first,the ground with the PEC boundary,then a substrate with a patch over it and a via in the middle of substrate,then above all there's an air box with height of lambda/4.Then I use
I have just started using HFSS. I have few questions regarding the boundary conditions and the excitations used in HFSS. In my model I am using a lumped port to excite the slot antenna. The port is placed across the slot at an offset from the edge of the slot. I also have a pml boundary condition set to a box at a distance of λ/4 from (...)
Hi, the absorbing boundary condition should give good results as long as the direction of propagation is perpendicular or with small incidence angle to it (which is why it should be placed at a distance from the geometry) the pml gives good results for any incidence angle, that is why it needn'e be placed far from the geometry. But it has a d
Hi ricy, emrek, goodbozs2005 yes I see all the references but there are nothing to help me. My problem is 3D and a little complicated. pml boundary condition, exitation, dielectric discontinuity and its effects in FEM solution are other problems. thank you for your time. regards
Anyone having these papers? thanks very much. Modification to convolution CFS-pml for the ADI-FDTD method, Feb 2006, Microwave and Optical Technology Letters Microwave and Optical Technology Letters Volume 48, Issue 2 , Pages 261 - 265 Modification to convolution CFS-pml for the ADI-FDTD method Linnian Wan
my code is about PhC waveguide(2D). with pml boundary , the total time step is 10000 steps , i want get defect mode e,g, the band gap of defect mode but i can't get the peak in the frequency graph , i always get a line (w=0); i know this is because there are some problem when i fft the ez field Added after 2 minutes:[/
It's depends on the real operating mode of microstrip line. If this line placed in box with metal shield on the top and this shield closest than one wavelength (another criterium also possible) You should consider it in simulation. If this shield far from microstrip or covered the absorber You should use the radiative or pml boundary type. Regar
I am trying to use HFSS to get the dispersion diagram for periodic structures, say, UCPBG. I used pml boundary ended with nothing and master/slave boundary to simulate periodicity. However, I can not get right dispersion diagram. I don't know if there's something that I need to specify to get right results. Can anybody send me a tuitorial (...)
Hi, I am trying to simulate an infinite pec metal in HFSS. I used master/slave boundary to make the metal infinite and used pml boundary condiiton. I tried both the PEC boundary condition and a metal box(very thin) in simulation but neither give me right results. Can anybody help me with this please? Also, have (...)
hi, I had a quick look on your file. I think the problem in the defining of the pml boundary's, there should be a radiation or FSS reference boundary. I will check it further if I had the time. hoping this give you a hint to start investigating. hoping that you will find a slon quickly.
With v10 you must set one Rad or pml boundary to "Referenze for FSS" and "Incident wave". This works, says the ansoft support. It looks ok to me. You cannot excite a "radiating only" boundary with a plane wave.
I want to use HFSS to simulate a slot line structure with the FR4 material as a transmission line to get the characteristic impedance and effective dielectric constant. The first question is about the port, should I use the wave port or the lumped port? Well, lumped port is better for the microstrip line structure, for the field is constrained arou
Thank you for your code. I think that this code can remove pml region because TFSF can hide the scatered field. I have any question about iinterpolate 1D incident wave to 2D at TFSF interface. Thank you.:D
dear friend : I WANT TO STIMULATE THE dielectric slab with 3D FDTD WITH 3D pml boundary CONDITION ,BUT MY CODE DOESN'T WORK ,CAN YOU SEND MY A CODE ABOUT 3D FDTD WITH 3D pml?I WILL BE EMAIL IS
if you use cylinder you cannot use pml boundary setup. pml bounday setup is recommended by ansoft to insure accurate field calculations. so if accuracy of radiation patterns is important, a rectangular or square bounday should be constructed and in turn defined in pml.
i would suggest using pml boundary for radiation problems, especially where radiation pattern accuracy or field calculations are needed to be accurate. this is suggested by ansoft. see attachement.
On your printed antenna, I would change a couple things. First, you need more room between the end of your antenna and any type of Radiation or pml boundary. Second, I would highly recommend a pml over the radiation, but that is your call. Third, I would add thickness to the metal, and then draw the integration line just between the two (...)
I am simulating a spiral inductor on multilayer substrate. Lumped port (It is also called gap source port) are used. An airbox is enclosing the component. So how should I specify the ground for the lump port to connect to? I used Perfect E boundary condition for the air box and connected the port to the surface of the airbox. But I found the perfor
I set a pml boundary on the coaxial line and sweep its "height" to achieve a desirable Loaded Q. You don't need to set a pml boundary for coaxial. The easy way is to define Impedanace boundary (Resistance: 377 Ohm, Reactance : 0) My question is, what do these "Eigen Qs" mean? Unloaded Q or (...)