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50 Threads found on edaboard.com: Boundary Layer
Hi everyone, I need some help with ANSYS HFSS software as I have little experience in this simulation tool. I am trying to compare the absorption or radiation performance of different boundary conditions such as Perfectly Matched layer (PML), first-order Absorbing boundary Condition (ABC) and boundary Internal (...)
Hi You should put the Radiation boundary at least lambda/4 away from the radiating parts of the structure. Calculate the distance and draw a bigger radiation box.
hi my question is whats application cladding layer in optic fiber or pin detectors? a object using cladding in optics fiber , The cladding causes light to be confined to the core of the fiber by total internal reflection at the boundary between the two whats the other objects???
Hi wr233608, You generally want the radiation boundary at least 1/4 wavelength away from the nearest radiating edge, which could include the ceramic in this case. So you want an air layer around the outside of the cover for best results.
Hi i exported shape while importing i got some issue which is mention in below ERROR(SPMHDB-187): SHAPE boundary may not cross itself. Unable to paste object of type "shape" on layer boundary/L19_PPS FORCE3 at (149. 325 -363.6468)
Hi every one I have a problem with periodic boundary condition in CST software. I have a cylinder with two layer coating which is infinite along z axis I used periodic boundary condition for z This warning occured: Inhomogeneous material at periodic boundary detected. Farfield results may be inaccurate. (The (...)
How to draw board outline, which could be exported to gerber file, in ADS? You can draw PCB outline working in ADS layout. If ' cond ' is your metal layer,select say 'default' layer to mark your PCB boundary.
Hi, everyone I'm a newcomer to COMSOL. I want to simulate S11 of a multi-layer EM absorber. My issues are below: 1. The top face is set port, and the bottom face is set Perfect Electric boundary to reflect EM wave totally. Someone said the face that is set port should define Perfect Electric boundary. What boundary (...)
Popular errors in 2D EM simulation for newbies: consider the ports definition and boundary conditions! My suggestion is to proceed in two step: 1. consider only the top layer, remove all the ground on top, use ideal bottom ground. Put 4 ports directly on the coupler microstrip. In this way you can verify and optimize the coupler (volker suggestion
I am not aware of any tutorials, but I have not looked. A PML is a Perfectly Matched layer (PML). It is an absorbing boundary condition so that outgoing waves do not reflected from the edge of your grid. You can find more information on PMLs in Lecture 8 here:
Create a Momentum substrate with open boundary (air) above and below the substrate. Map "cond" as a conductor at the top of the substrate Map "cond2" as a conductor at the bottom of the substrate Map "hole" as a via through the substrate For the conductor, drawn on layers cond and cond2 For the vias, draw on layer "hole". The substra
Is it necessary to set gnd plane as perfect E for microstrip design using HFSS? How about the ground placed in the middle layer of a multilayer design? How does it translate to the actual physical structure?
Using finite conductivity boundary condition to simulate a thin layer of copper and PEC individually for a transmission line without applying any thickness due to the small skin depth. I realized that the mesh on the PEC one is much much more and of cause smaller than the copper one. Would some one explain why? Thanks!!
Hi ali reading this paper helps you to understand the PML as a very good absorbing boundary condition. Three-Dimensional Perfectly Matched layer for the Absorption of Electromagnetic Waves by JEAN-PIERRE BERENGER good luck
i having some problem with my CST simulation of PIFA antenna. A simple two layer board simulation (Frequency Domain Solver) requires me to use FPBA instead of automatic. when i use FPBA, its refining the mesh again and again untill the end but doesnt solve the problem. The weird thing i observed is the boundary condition (box) is too big fo
A p–n junction is formed at the boundary between a p-type and n-type semiconductor created in a single crystal of semiconductor by doping, for example by ion implantation, diffusion of dopants, or by epitaxy (growing a layer of crystal doped with one type of dopant on top of a layer of crystal doped with another type of dopant). If two (...)
Hi, I am trying to simulate four layer reflectarray structure and i'm not sure what boundary conditions to use? Can anyone tell me how to define unit boundary conditions or i have to assign some other boundary condition? Thanks! Regard's, Arslan
the problem is that I can not make the coupling between the slot present in the SIW and WR. I'm not how to set the boundary conditions and what kind of excitement to the structure, particularly for the transition. I tried to create a parallelepid with the size of the slot and then subtract the layer of copper in the SIW. I can see graphically the
In Momentum, the size of the substrate is infinite. Always. The size of the bottom ground is also infinite if you use the //// GND //// ground boundary condition. If you want to simulate with a finite ground, you can draw that and map it in the EM layer stackup and then use FreeSpace boundary above and below. But for patch antennas that (...)
Hi, I am running Altium Designer Summer 09 and have been pulling my hair out trying to figure out how to display the cross-hatched area displaying the component boundary on the same layer as the component itself. I'm not sure how well that describes my question, so attached is an image of the problem. In the picture, the white rectangles wi
Hi Icpinu, I guess that you use a grounded CPW structure. If you didn't change anything on the backside metalization of Dielectric, by applying an open boundary (Freespace) under Dielectric then you loose your ground-plane. This is just a guess as I don't know your structure. If this is the case, you have to draw your limited ground-plane at the b
I am simulating a simple stripline in HFSS. The conductor dimension is comparable to the skin depth, so I set "solve inside" for the conductors. Then I also tried "finite conductivity" boundary condition. The loss calculated with the "finite conductivity" condition is higher than the other one. Does it make sense intuitively?
hi, with split pml, i observe an increasing field versus calculation time in the corner of boundary layer between split pml and FDTD area. I have searched a post about this topic but haven't found anything. So i am expecting some advice about corner, thanks
Hello Miky, Your EMSight Slotted Loop Antenna setup is wrong, based on the paper I have modified the following... removed internal ports (+1,+2) & added Via Ports Enlarged the Enclosre, & placed the structure to the middle of the enclosure box Added additional Air layer below substrate & set boundary conditions as Open Then added a explici
Dear all, I have a simple layout, with 2 conductors and 4 4 ports are differentials, the substrate definition is a FreeSpace layer, a Dielectric layer (let's say Alumine), and another FreeSpace_0 layer with open boundary. So, no ground plane. The substrate cal
There are 2 ways you can do this. For positive Plane: Just add a Route Keepin providing enpugh clearance from the boundary. Then select the shape, in the options tab select the etch layer, type of shape and assign the net name. Then draw the shape in the board covering the required area and close the shape. Select the shape again then keeping ever
Hi everyone, in the substrate stack the bottom layer is a GND plane by default. As a consequence, it is not possible to draw anything on the bottom layer. Is there a way to have a stack with a bottom layer on which lines can be drawn? If I select boundary --> OPEN, then the stack will have a substrate as bottom plate, (...)
I am having an HFSS problem and am fairly new at this. I have a pc board with a differential trace. It is a 4 layer board with grounds on the sides and also on the other 3 layers. When I put a radiation boundary around this, the boundary lines straight up with the differential trace and the grounds. It looks like you (...)
Can Any one help by providing the the codes for absorbing BC. in simulating the wave equation please?
Hello guys. I need some help with the via configuration dialog box in ADS. First of all, check my layer stackup out:- FreeSpace (open boundary) RO4350b PrePreg FR4 Air (open boundary) And here is some detail of the metallization:- FreeSpace -------- -STRIP-Routelayer1 RO4350b |VIA| diel2 -------- (...)
The "prboundary" layer is recognized as the boundary for the cell. Some layers (PP,NP & NWELL) may go beyound the cell boundary as they are all can be merged with other cells. So prboundary layer is called cell boundary layer.
Hello All, I am trying to find the best way to calculate the scattering cross section in COMSOL for a 2-D cylinder. I eventually will move to 3-D spheres and cylinders. What I have is a circle of 30 nm in radius and my circular PML layer drawn 10 Lambda away, where at this boundary (far field) I want to calculate the scattering cross section. I
Hi I have two problems: -first I have an error on calibre lvs "ne" for "named error" I changed the "M1pn" to "M1pt (M1pintext)" and "label" but the netlist layout is always different to the netlist source,how can I resolve this problem? -second, when I do a "gen from source" for two or four pixels(for example) and I connect them(vdd! gnd! psel r
There is a PIER paper on the topic which is probably available online. Progress In Electromagnetics Research, PIER 24, 257-­277, 1999 A BODY OF REVOLUTION FINITE DIFFERENCE TIME DOMAIN METHOD WITH PERFECTLY MATCHED layer ABSORBING boundary V. Rodriguez-Pereyra, A. Z. Elsherbeni, and C. E. Smith
when i was doing validation check, error message showed Warning - boundary 'PerfE2' and boundary 'Rad1' overlap. I guess your PerfE2 is ground layer and you define all 6 sides of the airbox as Rad1. You may define 5 sides (except ground one) as Rad1. Then this problem will be solved. Boun
When using the TFSF method the scatterer needs to be contained in the total field region. This is unrealistic since most periodic structures contain a dielectric layer which needs to extend beyond the TFSF boundary (as a unit cell). I can probably simplify my life by just doing away with the TFSF method but that leaves me with a problem of injec
nuddin: I think you can get a free space boundary at the bottom by selecting the layer indicated ///////GND//////// in the substrate edit window. Then, an option will appear called "boundary". Change it from "closed" to "open." I think this will put an open boundary under your GaAs substrate. However, I think it (...)
Hello guys. I need some help with the via configuration dialog box in ADS. First of all, check my layer stackup out:- FreeSpace (open boundary) RO4350b PrePreg FR4 Air (open boundary) And here is some detail of the metallization:- FreeSpace -------- -STRIP-Routelayer1 RO4350b |VIA| diel2 -------- (...)
If you have ever used diva tools to do the DRC, running diva in "full" mode for each cell with a larger boundary box may solve the problem. Any modification after a diva DRC run will generate a rectangle on "changed" layer. This layer may be invisible. Run diva DRC in full mode will remove any figure in this layer (but not (...)
Dear friends, I am modeling a basic FSS structure (a dielectric layer and rectangular patches) using HFSS. But i could not decide how to apply master/slave boundary condition. Can you help me? Has anybody got a sample FSS simulation? Hope that you will help me out Thanks.
ISBN: 0070553343 Title: boundary layer Theory Author: Hermann Schlichting Publisher: McGraw-Hill Science/Engineering/Math Publication Date: 1979-04-01 Number Of Pages: 817 Average Amazon Rating: 5.0 This text is the translation and revision of Schlichting's classic text in boundary layer theory. The main areas (...)
both boundary condtions use PML (perfectly matched layer). The "add space" enlarges the calculation box automatically for antenna problems, i.e. radiation patterns.
hi, i am trying to implement one planar archimedean spiral antenna ( 0.5 - 3 GHz ) with microwave absorber backing (to absorb unwanted waves) over metal plate back ground.but i don't know how to simulate the absorber in ansoft HFSS, should i go for a PML ( perfectly matched layer ) boundary whereever the absorber is located (but i think it has
In addition to prevent the damaging during die cutting, seal ring is also used to prevent moisture penetration form die boundary. You can use all layer from N-WELL, OD, PLOY, contact, M1, VIA1 ... up to top metal to surround your chip. Roughly20um ~ 50um width is enough. Every foundary has their recommendation. You can find it in layout rules.
1. Shooting and Parallel Shooting Methods for Solving the Falkner-Skan boundary-layer Equation by Tuncer Cebeci & Herbert B. Keller Journal of Computational Physics, vol 7 number 2, 1971 2. boundary-fitted coordinate systems for numerical solution of partial differential equations?A review by Joe F. Thompson, Zahir U. A. (...)
Hi, You can check boundary number in GDSII file. As for layer map file. I have a example as following list: 42 43; 42 is Astro technology file layer number for metal 1. 43 is gdsII file layer number for metal1. You can use map file to convert GDSII file layer number to match technology file. (...)
I am trying to use HFSS for simulating a Sievenpiper type of high impedance surface. I want to obtain the dispersion diagram. 1)how far away I should put the PML from the object (top patch). does it still need lamda/4 requirement as radiation boundary? what is the criterion for PML setting: (a) PML uniform layer thickness (b) minimus radiating di
With the top boundary as "open = 377 ohms" , what is the minimum height of the top layer required to get correct input impedance. I knew the short commings of the conductor walls of the design space: but I thought if the top boundary is open, it shouldn't matter how thick it is. The thicker the layer, the greater the (...)
PML is Perfectly Matched layer is a kind of boundary condition alternative to radiation to be used when you want simulate an open model (antenna, FSS....) LBC means Linked boundaryu Condition and is equivalent to Master and slave and is used fopr periodic structure but also for simmetric model... Hope this help R
This question goes to all EM wizards. Lets say we want to simulate and find out what should be the transmission/reflection loss of one or multiple dielectric layers. Which EM simulator do you think will easily do the job and how would you set the following generic (with most simulators) conditions: 1. boundary conditions should be set to per