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hi guys any information on simulation of lambda/4 with pec ground using hfss,i will be thanked
hi all, i was trying to simulate a simple monopole on hfss. however, when i was doing the simulation, i noticed that the length of the monopole doesn't exactly follow the lambda/4 eqn; the resonant frequency seems to be 2 or 3 times higher than the antenna was designed for. i think it has to do w/ the radius of the monopole, as well as the size o
Hi, I'm trying to understand basic simulation on hfss. I've been told that when using boundary RADIATION, the airbox should be set up with lambda/4 air space, being lambda= c / freq (this freq is the one that is set up on "solution frequency" on Analysis options) My question is why lambda/4 should be the minimum? I'm (...)
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
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 everybody, I am trying to simulate a lamda/4 monopole at 10GHz in hfss(version 9.0).I use a lumped port excitation(small rectangle) between the monopole and the infinite ground plane.The main problem is that the radiation pattern is not omnidirectional for 0
WHAT IS THE PROBLEM WHEN YOU USE THE hfss to simulatie the E fileter
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 have peculiar problem with my hfss v9.2, while simulating my antenna structure which is 2 p@tch antenna line fed, substrate is ferrite based, frequency of operation is 10GHz, now when I'm analysing the structure its saying that simulation complete with server error, lambda refinement meshing:process mesh3d died unexpectedly, or Adapting mesh:proc
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
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...
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 (...)
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: 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
"unable to recover all surface triangles" most probably means two of the points specifying a triangle are too close to each other thus the triangle becomes a line under the "resolution" of hfss. the reason might be: 1. the object (you removed) is too small 2. the object (you removed) is specified with an edge/point that is too close to edge/point
I have a simple question :-) I have a dielectric sphere. A plane wave is incident on the sphere. And I want to calculate the far fields. This is what I have done: I created a sphere and a box surrounding the sphere. I assigned plane wave excitation to one of the faces of the box. And I assigned radiation boundary to the other faces of the box. Sho
Hi maverick09, Use (ADS) line calculator to get the port impedance for your Transmission line or waveguide, and then compare it to whatever hfss is given you. The difference between the two should be small in the order of few ohms at max, that if your hfss setup is correct. bouchy
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 (...)
Attach the hfss file here, so we can take a look at it.
How can I calculate the effective area of antenna using hfss.
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
Dear all, I am using hfss to simulation a patch antenna with a lumped port. I know the rule of setting up the dimension of radiation boundary to be more than lamda/4. However, I found out that with different boundary sizes, the simulation results are different. What is the problem? How can I get consistent results? Thank you for your help,
here is hfss 9.2 full document ,you can find what u want
Dear abhi_kolkata accoring to the hfss manual: in section 5.6 there is a cpw bowite antenna example say, from 8 to 10GHz , then , we should set the radiatin airbox lambda/4 larger , where the lambda is according to 8 GHz . rgz kaka
I simulate a horn antenna by hfss.But i find the gain G is smaller than the directivity D. Usually ,G=ε × D , ε is efficiency ,0<ε≤1.
Dear alll I'm just a newbie in hfss designing. I want to fnd out the characteristic of passive element using hfss (for example Y11 phase, Y11 magnitude, capacitance, inductance) I made a capacitor using LTCC process and then I simulate that using hfss. But the measured data differ from the simulation result. I am uploading
The airbox in hfss should be at lambda/4 away from the nearest the radiating structure, is this lambda referenced to the solution frequency or to the lowest frequency in the frequency sweep? Thanks
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 (...)
This is the example on hfss document, in this case, they used waveport (not lumped port). Have you ever tested using lumped port?
Hi I working on patch antennas on hfss. I designed a antenna inside a dox of air so to be able to simulate VSWR and radiation diagrams. I have two questions! 1. My model converges with aprox. 113000 tetrahedra, which is to much for my PC. I tried on two different PC, one with 1G RAM and other with 2G RAM, and they both stop at about 90000 tetrah
The port setup for stripline should extend to the top and bottom grounds, and should be wide enough so that the fields from the trace do not attach to the sidewalls of the port. For hfss models, the recommended port width is 8*w if w>h and 5*w if wlambda/2 in any direction or a waveguide mode
(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
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
If you post your project I can simulate it in hfssv10 to see if the directivity problem is fixed in the new version.
Hi, I've done a model in hfss for an inverted planar F antenna for 868 MHz on a FR4 substrate of 100x85 mm^2 and a ground plane 100x65 mm^2. I've fed the antenna with a microstrip line designed for 50 Ohm impedance. I've also used as radiation boundary a vacuum sphere of radius 270 mm, more than 3/4 lambda at 868 MHz. I've assigned to the anten
Dear all, I'm doing a simulation for a cylindrical cavity with 8-slots corrugated walls (magnetron cavity) on the hfss V. 9.0 But unfortunately, I'm facing some troubles !! What I'm trying to get right now is to evaluate the resonance frequencies of this magnetron cavity and compare those resonance frequencies with the output of a Matlab c
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
Have you just tried to use the hfss full book spiril inductor simulation example. Myabe if you tried this you will see how your simulation setup is different?
@yzriver i'll give it a shot in hfss during the weekend...
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 (...)
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.
@pollop hfss is not that easy, so i recommend you to study the manual carefully and practice some examples in it, radiation boundary is used when you are simulating anteenas or radiating objects. in real life we have a free space around us to infinity similarly radiation boundary in hfss represents the boundary which absorb
Hi maciasas, I think you can try with lamda refreshment = 0.3333 as default, and no need to do mesh for simulation as refering to hfss_v10_full_book. hfss will automatically mesh you model and It's the simplest way to overcome big mesh problem. regards!
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 (...)
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.
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
Hello , I have great experience on NEC , but I am totally newcomer with hfss. I want to model an antenna which is built like this: A full wave round loop in front of an full wavelength circular reflector ( refl to loop distance is lambda/8) . No problem to build the model , but the results I get are very far from what I've found publisehd ab
Hello All! At modelling mirror aerials (frequency of 30 GHz, diameter of a mirror of 100 mm, a focal length of 50 mm and AirBox of 102x102x70 mm) hfss gives out a following errors: Solution Setup 'Setup1': Given the specified frequency and model dimensions, an extremely large mesh will be required to produce an accurate solution.
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?
I got with the basics but in designing the Branch Line Coupler, I am not able to find the formula for the width of the Branch Line coupler. The length is lambda/4 as usual. I'm using Ansoft hfss V10. I need the formula for the width of the strip. @gvinu4u: Because you got the basic principles of Branch line coupler, So