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99 Threads found on edaboard.com: Lambda Hfss
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?
In hfss : Is the Air Box atleast lambda/4 away from the radiating structure ?
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
Hi Bukero, You need to write an expression for refractive index, permittivity and permeability in terms on SYZ parameters. If you have the expressions, you create an output variable and plot them with respect to frequency. If you are using Driven Modal solution, you take a look at the effective epsilon and lambda from the Matrix data. -sv
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
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, lambda/4 distance should be applied to all sides of structure. this ensures absorption of signals at boundary with minimal reflection. you can always increase more than lambda/4 but simulation time increases as well. there's a change in resonant frequency as the E-field could be disturbed by reflections off the boundary, since the port is dir
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
By "hole" do you mean a via between your signal trace and ground? If yes, the main requirements are that the hole/pad diameter is less than lambda/4 of your design frequency. This hole condition is required for it to not radiate (losses) and the length of the via should be less than lambda/4 in order to avoid an impedance transformation at the shor
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
1. I would say pick higher frequency of the UWB range as a adaptive frequency. I would suggest pick 15 GHz. 2. You want to make sure that all the waves get absorbed at the radiation box . If you use regular radiation boundary, use freq at 17 GHz.. FYI, if you are using FEBI boundary you can shrink your box to lambda/10. 3. Discrete sweep will give
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.
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???
Depends on what you are simulating. lambda is often the rule of thumb for antennas since they usually do not radiate further than that. If you have prior knowledge to how far the fields radiate you can better estimate how far/close your air box has to be to your device. If you are to close to the radiate fields they could reflect off your air box
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
Hi, The air box size should be at a distance of \lambda/4 from your structure.
@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
you radius of surrounding sphere needs to be much smaller :) I tend to go for a radius of about lambda/10 depending upon the simulation Have Fun
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 (...)
dipole radius = lambda/200 gap_source = lambda * 0.0125 res_length = 0.475 * lambda dipole length = res_length/2 - (gap_source/2)
Is your radiation box size atleast lambda/4 away at the lowest frequency of your operation ? If yes, try PML boundary setup. -sv
Hello lambda/4 is the minimum dimension you are supposed to have. it is better to have a dimension larger than quarter of a lambda in every direction and especially in the direction of radiation. you can use wave port and have a rectanglular pec on top of the port to have the wave port inside the radiation box solved or use lumped port. i ask you
Hi Aparna A hertzian dipole is supposed to have a length<< lambda, it doesnt seem to be the case with your dimensions. what you are talking about here is just a Regular Dipole. Regards Rotmanlens
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
Normally the box dimensions are at least lambda/4 from the surface.
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
It depends on your specifications but most practical way is to design it at 1.85 GHz as lambda/4. For larger bandwidth you may design log periodic dipole.
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.
as sv has noted, unless you have a two port antenna, you will only have s11. you can use friis equation to get a line of site distance for two antennas if you know the input power at the tx side using Pr/Pt = GtGr(lambda/(4pi*r) where r is radiation distance Pr & Pt are power at receive and transmit ends and Gt and Gr are gains. good luck
k=2*pi/lambda; f=c/lambda, therefore f=c*k/(2*pi), c is the light speed in the vacuum.
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 Make the air box larger. At least lambda/4 on all directions to the nearest structure. Regards
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