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99 Threads found on Hfss Lambda
i had design the dipole at 2.4GhZ, now prob is at the end of the design need to draw radiation box . what are the rules for drawing the dimentions of radiation box? is there any rules/equations / any relation with respect to lambda?
Hello. I did the design of the antenna with CST, but when I compare with hfss, I get a big difference of the reflection coefficient. What is the problem? Is it the airbox or the port or what?
Hello everyone! I made design of 5 x 5 TEM horns planar array in hfss, and found that there are the great back lobes (comparable -5, -6 dB to the main lobe) in all most frequency range. Element period in array < lambda (min). Has anyone seen this problem before? and how to fix it? I don't know where the back lobes come from. Thanks for advanc
hello how could i evaluate S parameters (db S11 AND S21 ) Versus Frequency plots in hfss.. regards Bukero
I modeled a microstrip patch antenna in hfss with airbox only lambda by 4 over the patch antenna. The airbox sidewalls and base touched the antenna, so none of the substrate edge scattering ripples are seen in the S11 results. I, then, fabricated the antenna and saw bunch of ripples in the S11 results, though the pattern matched well with the s
I have designed a dual layer differential microstrip antenna .This is my first hfss simulation model and also I am very new to Antenna theory. This was designed based on a research paper . The model is running but the results aren't as they should be. (Like VSWR is highest at working frequency of 900 MHz; real and imaginary part of Z0 are coming ze
I have some questions about radiation boundary I want to clarify, 1) How long should the radiation boundary extend? I have heard it should be 1/4 of wavelength. If so, which is the correct way to implement? 121536 1/4 wavelength height and start at position 0 (bottom, ground plane) This makes my radiation patte
Hi all i'm going to design an infinitesimal electric dipole above an infinite pec for height lambda/2.I'm going to earn figure 4.17 in antenna book,Balanis but the results aren't good at all.(VSWR and radiation pattern) i don't know how length i need for air gap in infinitesimal dipole?and don't know what is the problem? I'm using hfss13 and d
hello can anyone here please upload for me a layout for wilkinson power divider in hfss any design would be OK, i'm new to hfss and want to see how the layout looks like anyway my design is operating at 3GHz with equal P3:P2 lossy with lambda/4 matched Thanks in advance Hi, It's better if you can come with your la
Hy, I am a beginner in antenna propagation and hfss. I have a quesion about the monopole antenna. I fixed my antenna on a cylindrical Cavity build with a NEW material with relative permeabilty 1000. when I valdiate it does not display errors and when I click on analysis at the beginning it works then it stops doing in lambda refinement as shown
Hi friends, I have designed 3 rd order band pass filter in hfss. For short circuit stubs, i used a small cylinderical hole in hfss with radius as 0.4mm. Is there any standard formula or dimension ? Please guide me
1- radiation buondry means the space that you should define as a farfield area and make it as an radiation , so your device can radiate in far field. thid area should be more than 10*lambda 2- to calculate the equations, hfss has some passes, if the difference between two results in each passes is less than for example 0.02 (that yourself define it
Hi in literature sometimes we give the input impedance as a function of L / lambda0 (normalized length) Please, can someone show me how to do to plot it as a function of L / lambda in hfss for whatever structure (e.g. for a dipole, or a patch antenna). of course I know how to do it as a function of frequency. Thanks
Hello. I am new member in this forum. Please help me. UWB Range=3 to 17 GHz Notch at..range=5.1 to 6 GHZ My questions are.... 1.What should be my solution frequency in hfss? 2.What should be the dimensions of the AIR-BOX? (if (lambda/4) then....lambda of which frequency?) 3.What should be my frequency setup and sweep?
Hello I want to know that What should be the Dimension of radiation box in hfss?
Hi. you should be choosen the size of air box,lambda/4 larger than substrate or your design. your design should be completely inside of air box. Good Luck.
Hello, I have a problem with a very basic simulation. I am trying to simulate plane wave propagation from one medium to another. The problem is not the setup, but the phase of the wave. Setup: All lengths in the setup are parameterized. The basic length unit is the free space wave length lambda (@14Ghz). Die setup is 4lambda long, with (...)
Hello Everybody I am working with hfss. I need to design a circularly polarized MSPA with 5% AR B.w at 30 GHz the dimensions has to by <= lambda/2*lambda/2. Please any suggestions???
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 (...)
Hello, I am simulating some lambda/2 series CPW resonators, and have been getting some disagreement between my results when simulating by Wave Port or Lumped Terminal. They both show resonance at roughly the expected frequency, but disagree on order of a few hundred MHz. I am inclined to believe the wave port results as they are close to ADS Mo
I can confirm that in hfss for eigenmode simulation of planar structures, having the PML 1/4 of a wavelength from the structure gives the same results (or as much as is discernible) as having it to within 1/30 of a wavelength. As far as I can tell from the information provided, your setup looks correct.
@anvc - This sounds like a problem with mixed units or improper setup. A simple dipole should not take more than a couple of minutes to solve. Even though the structure may be large in physical size (17 cm), it should be reasonable in electrical size (lambda/2). Check to make sure your units are correct, and that your analysis frequency is appropri
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
Yes! hfss simulator does not automatically assign the model to exist in vacuum. One has to specify the model to exist in vacuum by drawing an air box of specified dimensions (preferably lambda/4).
Hi All, I'm working on ungrounded CPW structure. I've been through all previous post about CPW , how to feed it and Ansoft tutorials,and I designed a cpw antenna with SMA. From Antenna_kit released by ansoft I realized that the length of the coax should be lambda/6. So I simulated my CPW with 4 different feeding, 1.SMA with lambda/6 length, 2. SMA
But the standard method in hfss to analyse an antenna is to put it in a box which is lambda/4 away from the antenna - they call it an airbox. Outside the airbox is a perfect electrical conductor. PEC for sure? Does that make sense? All 3D solvers that I have worked with use absorbing boundaries for
I've been using hfss to simulate the radiated power of nano particle ,the excitation is hertzian-dipole (I*Dipole Length=1A*m,Type of dipole is Electric dipole (Magnietic current loop ),Hertzian-Dipole wave options:radius of surrounding Sphere is 10mm which is much bigger than the boundary ),but now ,the results do not agree with theoretica
1. If I am going to have a receive antenna in simulation model, why do I need a radiation box? The radiation box measures the power radiated, gain, the far field, but what if I have an antenna in far filed to measure all that? 2. Also, the minimum radiation box size of lambda/4 is not in the far field since minimum distance in f
hmmm...i was just reading about hfss-IE and FE-BI and ran into your post. So, all we have to do is check the "Model exterior as hfss-IE domain" and set boundary box to lambda/10 and we should have a Hybrid FEM/IE solution? Is there anything else we need to do? Also, how about just simulating using hfss-IE alone. I am (...)
Hello people! I'm trying to create a λ/2 dipole antenna at 402MHz, but i have some questions. Is there a rule to follow on setting : 1)the dipole radius? 2)the source rectangle? 3) the dimensions of the cylinder (of air) on which i will ass
Hello!! I'm trying to simulate a metamaterial srtucture in hfss, the problem is that when i change the size of the vaccuun box, the S-parameters change too, which causes a switch on the ressonance frequency, i read the topic about the size of the air box, but i still couldn't figure out what's wrong with my setup, i add the file of my simulation
No worries. Yes you can use waveport in this structure with a PEC cap on top of it,since hfss does solve inside so a waveport inside the radiation box yields you an error. so put a PEC cap on top of the waveport. No i havent really worked with a CPW prior to this one.But if you have any literature pertaining to your question i should be able to h
but am doing simple rectangular wave system is 64 bit and am using that the problem? i would agree that using hfss v10 is a problem... hfss14 is now available, and MUCH better!
You want to keep effective lambda / 4 for radiation boundaries and effective lambda / 10 for PMLs. However, if you want correct far field patterns, you will need to go to hfss -> Boundaries -> Edit Global Material Properties and change the global material from air to whatever the immersed medium that the far field will be measured in. Have (...)
Hi, so first of all, take care of the RadiationBox dimensions...from the hfss guide we know that this should be at least at lambda/4 from the radiating surfaces..check you design to assure that. What is the frequency range ? best
in SIWave you can simulate the PKG of a chip, you can use also hfss and Q3D from Ansoft. if you go for any of these directions, you should use the Ansoft Links tool to import your bondwires/solderballs/layout/etc. For higher freq you should use hfss, if your structure is electrically short (lambda/10 rule) you can use Q3D, both tools are 3D (...)
Hi all, I am wondering if someone could take look at my CPW hfss project and explain to/show me why it is not working. I am simply trying to simulate a high-Q, 2-lambda resonator, whose resonant frequency is 2GHz. My results do not show any well defined resonant peak or a high quality factor. I have tried everything I can think of and looked
hi friends i'm working on a slot antenna.and i wanna know how should i define the dimensions of radiation box in hfss.
Hello, I am implementing Power divider using stripline. I have used lambda/4 = 75mm (1GHz) & air as a dielctric material. My question is that suppose i want to implement 57ohm line so to find out width ill first terminate it at 57ohm then see the reflected impedance if both are same then it is 57ohm characteristic line. Now if i terminate this l
I suggest you to use CST or hfss for antenna design
For the boundary : you will define a radiation boundary with size of lambda/4 on both sides. For the excitation : you can use a waveport. Check this website: em: talk - Electromagnetics and Microwave Engineering , it has few examples in designing in hfss
HI I am trying to simulate the eigenmode of a cylinder cavity, but everytime I hit the running, the process bar just gets stuck while doing "lambda refinement" and never go forward. I attached the model (hfss-V12) here, can somebody tell me how to solve this issue? THanks.
Hi ihamieh, You cannot get the information about the actual distance covered by antenna using hfss results. Using the Friis's equation mentioned by ghb, you can calculate that. But for that you need to know the gain of the Tx antenna, power transmitted and power received and the remaining parameters. And what 'ghb' meant by a 2-port antenna
Hi, Anybody knows how to get 'Line of light' in the Dispersion diagram in hfss???? Can anyone provide the formula for it and explain the procedure to do it. I have got the complete dispersion diagram of my unit-cell structure but i am unable to add the 'line of light' to it which is very important in order to correctly figure out the Frequency B
what in meaning of this error in hfss10: lambda refining mesh, process mesh 3d : unexpected internal software error cod 1054 with module id 0 .
Hi, I used the online synthesizer for a 50 Ohm CPW line. I simulated that on hfss V.11. And got a 50 ohm result too. But somehow the CPW structure radiates, not sure if it was from the feeding or the structure itself. The maximum gain from the 3D polar plot was around 6 dB. The radiation box is approx lambda/3 away from the structure. I don't think
I have made s simple dipole with lumped port at center and variable air box size. The impedance changes quite a bit versus air box size. I think hfss recommends at least 1/4 lambda from antenna element. Zreal changes from 82 ohm to 95 ohm when size increases from 1/4 to 1 lambda at 1GHz. The minimum Zreal at 82 ohm is when size (...)
Hi all, I am a beginner in using hfss. Need your kindly advice and assist if you don't mind. Currently I'm designing a printed antenna using hfss, this figure show the antenna structure and problem is the simulation give a negative gain as the result. I
Hi guys, I'm using hfss to simulate an antenna, and I've run into an interesting problem. The antenna is surrounded by a standard airbox, lambda/8 at the longest wavelength away from the antenna, as recommended. I'm interested in simulating the effect of an infinite ground plane on the antenna, so I use a perfect E boundary on the bottom fac
Hi every body! I have encounterd a strange problem in simulating an ordinary circular wave guide in hfss,The problem is that when the length of the circular wave is equal to lambda of the guided mode in waveguide (for the dominant mode(TE11) ) S21 will have a very sharp decrease in this frequency.please note that this can not be related to the hig