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99 Threads found on edaboard.com: Hfss Lambda
Of course each iteration uses more ram.. it is using ever more tetrahedra to mesh. Waveguide filtters are tricky, as they are large compared to lambda but there are some get-arounds: If it is a normal type of filter, these are very well understood, and there are standard formulae for calculating a starting point. They are usually symmetri
i am simulating a monopole antenna lambda/4 for 435 mhz in hfss. i am getting an error that simulation of the mesh is complex and thus the simulation does not start. please suggest a way to simulate the 435 mhz lambda/4 monopole because the mesh is very large. also please suggest all the parameters affecting the radiation patterns like emi...
i mean if i have the same structure simulated using hfss and q3d what is the error between the s matrix from both ??
dont know where u can download the hfss file but for a monopole the width is less than lambda/20 and the length is supposed to be just less than lamda/4. i hope it explains your question. regards sajid mohammed.
u can use hfss to do works fine but u know with a finite ground plane your gain would be 3-dB less than what it is supposed to be and the sidelobe levels shoot up.the concept of finite ground plane is when u assign the dimensions of it less than 10*lambda.anything more than that is considered infinite ground plane. regards sajid mohammed
Hi, I'm simulating a mushroom structure in order to extract circuit equivalent parameters at 11 GHz. lambda refinement set to 0.05 ΔS=0.05 The problem is how to mesh correctly the via ?because the meshing subject is not clear at all in hfss help. Thanks
Hi, I'm working on an UWB antenna and I don't know how I fix the dimension of the radiation box?? I know (lamda / 4) but if I?m working on an UWB band from 0.3 GHZ to 4.5 GHz for example so what is the lambda to choice (corresponding to which frequency??) Thank you for your reply,
hi. i'm simulating an antenna at 5GHz in hfss. the results for the 3D polar plot are choppy (shown in the picture). my airbox is lamda/4 or greater away from the antenna. the airbox is greater than lambda/4 from the antenna because i need to include the metal sheets. i put the airbox lamda/4 away from the metal sheets. i don't think the
Hi All, I am Newbie, I have problem when i tried analyzed an example insided Ansoft hfss, this messages displayed : lambda refining mesh, process mesh3d : Unexpected internal software error code 1054 with module id 0. (2:36 PM Sep 09, 2008) Simulation completed with execution error on server: Local Machine. (2:36 PM Sep 09,
can you upload antenna's hfss file to forum? or email it to m_zw@hotmail.com i try to modified it
Hi ! I?m trying to simulate a folded slot antenna in hfss. However, I found that the Z parameters response, strongly depend on the size of the substrate in the X and Y direction. Of course I kept the thickness of the substrate constant and the air box radiation is lambda/4 high. Please, could anybody suggest me how can I determine the correct size
Rewind here, are you designing the microstrip using hfss? I thought the user has to tell hfss what the frequency is, for analysis. Or are you talking about the guide wavelength?
hi i know the relation to find the impedance of helical antenna according to kraus is 140*C/lambda for axially fed antenna plz tell me is this true for any conductor size, any number of turns for a particular central frequency. and how to check impedance of helix of in hfss? thanks in advance
You might look into TICRA and Sabor. They are worlds appart in cost and capability but both are reflector tools. I have not tried to evaluate a reflector using hfss but I am not surprised that you are getting signs that the model is huge.
you mean hfss ha? It may also arise because of a non-smooth transition. make your contacts as smooth as possible. for example when a sphere and a large cube intersect
Has any one had a problem when using mesh settings (either manual or lowering the value of the lambda refinement of initial mesh) in computing far-fields. We have noticed that sometimes when we set these mesh properties too high, the far field calculation becomes garbage even though the S-parameters are correct. Any thoughts are appreciated.
I've done some planar spirals in hfss. You'll probably have to use lumped port, as in the attached picture. Due to the very low frequency I would expect a huge rad boundary around your tiny antenna... EDIT: use many dummy objects around the antenna to improve the mesh.
Hi Friends, Recently I use hfss to simulate a circular patch loaded with annualr ring antenna. S parameter is ok, but the directivity is below than 1. I seed the air with lambda/10, and the boundary is lambda/4 away from the radiation element, but the result is same. Anyone can give some advice? Thanks a lot! The parameter from (...)
hfss regular array works fine with dipole array, make single dipole at origin and use the array setup, you dont need to have two or more anteenas physically just draw one and use array setup.
Hi everyone... I want to simulate phased array (2-dipoles quater lambda spaced)antenna 1: Far field pattern 2: Directivity 3: Gain...etc..... which is appropriate....MATLAB or hfss. MATLAB is not recognizing polar or polar_dB commands... it may need antenna toolbox.....I have RF toolbox... About hfss i (...)
I have an array of two dipoles spaced lambda/2 apart, and according to Balanis textbook result, I should get a different radiation pattern when the excitations are 180 degrees apart in phase. In my simulation, however, I see no difference in the pattern when I change the phase of one of the excitation. I was wondering if there was any other met
Hi, I'm starting to use hfss so I must be doing something wrong. As you may see in my file I am trying to get a planar antenna to work. However, S parameter is (in absolute value) too low, I was expecting something greater than -20dB. Please help me. The hfss extention has been changed to hfs Thanks Pedro
Hello all. i am facing some problems in estimating radiation efficiency of a proximity coupled patch antenna. I am using a lumped port excitation. The problem: The radiation efficiency reduces as i increase the dimensions of my radiation box!! It is around 80% when the box just fits the patch structure along x- and y-axis. And it reduces t
If you post your project I can simulate it in hfssv10 to see if the directivity problem is fixed in the new version.
This is a common problem in hfss. As the first post said, seeding the mesh down to 1/10*lambda will make sure the boundary is sufficient. Make sure the conductor has the finite conductivity (no PECs) and include the loss tangents of any substrates. Also, the radiation boundary doesn't need to be spherical. A box is just as good. The mesh is the
(1) Using a radiation boundary that is lambda/4 away from the transmission line should be fine. Since you are not simulating an antenna (strong radiator), you may could even use a PEC boundary if its far enough away from the transmission line. Since the signal is propagating down the microstrip line and not into free space, as long as you don't int
1. Try installing 3 GB of RAM. hfss v10 is compiled to utilize a PC with 3 GB of RAM, although there will be an upper limit. The other solution is to use a 64-bit OS such as Linux or Unix. This circumvents the entire memory addressing limitation of a 32-bit OS. 2. Radiation boundaries can be placed up to lambda/4 away from the antenna. PMLs can
I think such a structure (a full sized car) is very large (you are simulating a structure that is around 12 lambda * 5 lambda * 7 lambda). For such a large structure matrix inversion used in FEM used in hfss would be extremely lengthy. Have you tried time domain solvers, such as CST Microwave Studio or XFDTD. Best (...)
Please, anyone knows why when I simulate a very simple T-junction I get the error: "lambda refining mesh, process meshed: error while opening or writing the mesh files" How can I solve this prolem?? Thanx
Sorry, there is a wrong in my question. The result of hfss is that the gain is larger than the directivity. The result of hfss is wrong? Possible reasons: 1. in ur simulation model, metal loss is considered 2. mesh on the radiation boundary is too coarse, therefore the far field calculation is not accurate. regards.
hi, i have posted a tutorial on hfss so you can see it on this url good luck
hi, i have a very basic doubt about hfss boundary conditions.can anybody tell me wat is a radiation boundary in hfss?why, if at all , we need to define a radiation boundary for antenna structures(such as a microstrip patch antenna).and whether we need to define it also when we r simulating non-radiating structures (such as micromachined phase sh
Dear Sir: Oh, did you get the H-plane and E-plane in the far field on hfss?How could you do that? Is it as follow:Choose Creat report?far filed ? radiation pattern?rE?rEtotal? dB? But that just means rE, not E. I want to plot the E-plane and H-plane, while I cannot find E just rE, so could tell me the step to show the E-plane and H-plane? T
Hi everybody, I have recently conducted a series of simulations in hfss to have backward wave characteristics of Jerusalem Cross FSS layer. But unfortunately I can not have any converged results even if I have logically true results. My configuration is as follows: Sweep: 0.2GHz to 27GHz with 0.2GHz Solution Freq: 27 GHz Maximum # of p
Hi bingjiang99, Perfectly Matched Layer (PML) is a fictitious boundary condition. it's a kind of abserbing boundary condition with lossy & unisotropic meterial. its parameter is calculated so that it has no reflection theoretically. In hfss if you wanna near radiation box to the structure smaller than lambda/4 or you want to have more accurat
Deal all, I am simulating a filter with 50Ω microstrip as input/ouput (Er=2.2, h=1mm,w=3.11mm, Fre=9-11GHz) in hfss. According to the rules, the width of waveport is about 5w and the height of waveport is about 4h. However, the dimensions of the waveport exceed the lambda/2, which permits the TE10 retangtular waveguide mode excitation. If t
obtain the gain/directivity with hfss and then use the formula G=4piAef/lambda^2
Hi i'm italian and i try to use hfss but i' ve got some problems. I try with a wellknown object: a flat plane the result aren't correct. From Skolnik "Radar Handbook" the expression for RCS is: 4 pi A^2 RCS = -------------- lambda^2 use 3 GHz (lambda =0,1), A= 0,25 m^2; if i watch the (...)
Hi, I am using hfss to simulate a coplanar microstrip lines. I am confused on what kinda port I gotta use,i.e lumped port or waveport. Also if my coplanar strip lines are terminated by a complex load(R,inductance or capactiance) will lumped port work out fine?. Thanks for your help.
Hi! I'm newbie with Ansoft hfss and trying to simulate lambda/4 microstrip antenna. Until now I have - drawn a plane on outer cross section of microstrip feed for waveguide port (not assigned to any material. should it be?) - defined the plane to waveguide port and defined terminal line from the top of the groundplane to the bottom of the m
I agree with a_aziz and loucy. Simulating a half-wave dipole in hfss showed that a radiation boundary distance from the structure has significant influence on the dipole impedance, while not so much on radiation pattern. Anyway, put your rad. boundary as far as possible (2 lambda) to get good results on both...
Dear Sir: Thanks for your kind help! As you said -------------------------------------------------------------------------------- hfss people say to choose boundary at minimum dustance of lambda by 4 ...the mesh length can be done using lambda by 6.....the more smaller u go...more accurate the result but more is computation (...)
hfss people say to choose boundary at minimum dustance of lambda by 4 ...the mesh length can be done using lambda by 6.....the more smaller u go...more accurate the result but more is computation time... so lambda by 6 is better...
Hi xxgcatz, for a simple monopole it is convenient also in cst to use a discrete port. If is quite the same model as a voltage segment on a segment. I think accuracy will be almost similar if no coupling information between serveral ports are needed. Cheers, Element7k I simulate a simple monopole antenna in feko, and the an
I need simulate lambda/4 transformer in the r100 waveguide (22.86mmx10.16mm) I use Agillent hfss 5.6 or CST MWST4.3 or MWST 5.0 Dont know why depending the guide wavelenght of the B size(10.16mm) in the simulation. Very easy example: design the waveguide, the B size modified across 20mm. This dimension equal lambda/2 in 10GHz. In this case (...)
hi guys any information on simulation of lambda/4 with pec ground using hfss,i will be thanked
Do someone have good skill to simulate in bad computer's hardware??? when i set the higher adative frequency in hfss, the error message show "lambda refinement will create large starting mesh". But i set lower adative frequency, my solution will not convergence. is it hardware's problem??someone kindly help me. Thks......
hi i use hfss in my design of yagi array,which better of feeding of that array,lambda/4 or step transformer impedance ,pls verify thanks alot
Hi all! I'm a beginner in hfss. The first thing I'm trying to do is simulate a simple monopole lambda/4 antenna with an infinite ground plane. I have a problem with this, I'll resume what I've done: - I've drawed a 2D plane, and then substracted a circle. - Then, I've drawed a coaxial line. The outer cylinder has the same dimensions that the 2