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179 Threads found on edaboard.com: Hfss Lambda
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 guys any information on simulation of lambda/4 with pec ground using hfss,i will be thanked
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
Hii All, Firstly thanks for the timely advices given to me by you'll, I could manage to resonate my antenna at the required Frequnecy of 10GHz, but now I have a new problem, my design runs smoothly for single frequency with the Airbox Height of lambda/4 (Approx 8mm) but when I try to run it for a sweep (from 7 to 11GHz) everytime its giving me
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
Have you tried to use Gain / Directivity to calculate the radiation efficience? How is the result, still great than 1? Hi, Gain/Directivity ratio was the first thing I looked at and as expected in this scenario, it is greater than one. By the way , seeding the mesh in the airbox to λ0/6 also did not help.
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, You can use Waveport. However - you must make sure that it is not too wide nor too narrow (ha !). 1) The waveport must touch all grounds (two coplanar grounds, and in grounded CWG also touch the ground and the bottom (as in microstrip). 2) The waveport must no exceed lambda/2 in any dimention. 3) The waveport must not be too narrow - i
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.
obtain the gain/directivity with hfss and then use the formula G=4piAef/lambda^2
hiall, Thankyou verymuch for the help. Its clear now. BUT (sorry if its irritating!!!..forgive very new to hfss) how to define TERMINAL line or INTEGRATION line. Terminal line---from center strip to side strips? --this may require 2 such lines(I understand that terminal line defines the + and - of the ports) INTEGRATION line---- (whi
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
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
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 (...)
Meet error during "Analysis" Port refinement, process abc3d : There are no boundaries to define "WavePort1" correctly. This may be due to incorrect material definitions for those objects that make up the port surface. Please verify the material assignments and properties. I am puzzled about this problem. Maybe it is related with boundary.
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
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
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?
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
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
Hi, I'm simulating a whip loaded by means of a bottom coil.I know that hfss is not the best choice in this case but I need to simulate with it to compare results with another program. I've created a radiation boundary with a big sphere (probably is also unecessary big but anyway...) and then I've added a radiation to determine far field parameters
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 have a simple question about calculate the dipole antenna induce voltage for plane wave incident. assume that the half wavelength dipole is terminate with its radiation resistance 73 Ohm, and I want to know what is the voltage value at the port when 1 V/m plane wave incident. And I also want to compare it with the theoretical value: V=E
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
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?
hi about ur question 1 i think u dont undrstand how work eigenmod i send u aexample of rectangular cavity from balanis electromagnetic book and simulation of this example solution in book resonant frequncy=9.28Ghz & Q=7758 solution in hfss resonant frequncy=9.2707Ghz & Q=7777.9 this example can help u undrstanding eigenmod note that
hi everyone, can anyone please tell me exactly what goes in to declaring the radiation boundaries for a radiating structure and how does it affect the accuracy of results obtained?? regards, wiztronix
Hello all: Could any one take a look at the hfss file in attachment. It is a log-periodic antenna for THz application. I can't have the similiar S11 as the papar presents. Do you see any problem is excitation? The frequency ranges from 100GHz-1.5THz. The mesh number may be huge if you try to run this model. Thanks a lot.
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 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 (...)