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Hi, Does anybody know how to define finite substrate in ie3d 10.1 ?
HI, I am wondering if I can define finite substrate in ie3d. I find the default substrate size is too big. Thank you. danda821
Im trying to model a patch antenna on a finite ground and substrate.I followed the manual in creating the finite substrate.But after the meshing when i try and simulate, it gives me an error message. "remove current graph from list remove current graph from list of simulating finite dielectrics" Could (...)
Hi lovhana The difference, between simulations using infinite substrate and finite substrate with ground, is that you get nulls all around in 90° because there is no energy beyond the ground. And No back lobes that exist in finite substrate with ground plane. there is differenc in the (...)
Dears, I have a question how can i draw finite substrate frame in ie3d software? Thanks.
Does anyone know how to define edge ports for a finite substrate microstrip fed patch antenna.? Anyone who has tried it would know that port edges have to share faces and then there is the negative and positive face story to complicate matters. THe FEKO guidetries to explain but there is no example to show how it's done. Microstrip ports won'
Hi everyone, I'm simulating an microstrip antenna (attachment), with microstrip line feed, in feko software. First i simulated the antenna in a infinite substrate, but right now i'm trying to do it in a finite one. Its a substrate with dielectric constant = 5; height = 1.6mm. But i'm having problems with the ports, (...)
Yes, it uses infinite GND for simulation, not substrate.They are not same things. In order to constraint this, you can use Momentum Box but I'm not sure that would work or not for antenna simulations..
Hi, 2cent: It ist just 2 steps: 1. Define the dielectric type and remove the infinite subsrate in Basic Parameters. 2. Draw the shape of the finite dielectrics and define it as a finite dielectric call in Adv Edit->Define finite Dielectric Call. Regards.
It seems to me the infinite substrate explanation is counterintuitive. Shounldn't we expect the effect of finite substrate to be more significant when the antenna is spaced further away from the ground? But ghb described that results for 100mil spacing are bettern than those of 30mils. More details of the design might be (...)
Hi, Bugpa: Please note the following fact for using ie3d for an antipodal Vivaldi antenna. If you model it as infinite substrate, you should be able to get resaonable s-parameters. However, the pattern may not be good because the main beam is in the infinite substrate direction. ie3d has (...)
Hi, Wavenumber: 1. What antenna is it? If it is a patch antenna with a reasonable size substrate, the radiation efficiency should normally between 50% to 90% in the resonance bandwidth. Surface wave is an important source of loss to efficiency. ie3d is normally quite accurate in predicting the radiaiton efficiency for such a case. If it is an an
Hi, poyinting: On ie3d, the scattering field is defined as the field scattered instead of reflected. When you define infinite substrate, there is scattered field and reflected field. Reflected field is a plane wave when the incident wave is planewave. Scattered field is a spherical wave. In some sense, if you model a patch on (...)
Hi, Jayanthi: I checked your model. It is ok. The pattern is not complete omni-directional. However, given the structure, it is like that. There is a dip at theta = 90 degrees. It is caused by the infinite extended substrate. If you use finite substrate, the dip will be gone while the overall pattern shape is still (...)
Hi, Authur568: It should be due to the meshing density is not large enough or meshing may not be fully aligned. Meshing alignment is very important for finite dielectrics modeling. Also, we did not take into account of the Er of the finite substrate in estimating the waveguide wavelength. The Er of the finite (...)
Hello, I am trying to simulate a coaxial-probe-fed microstrip patch antenna to achieve some proven data. I am using ie3d EM Design System , Version 14.04. I used finite groundplane by defining No0. layer's conductivity to be 0, then drawing a rectangle as the metal ground. I used the method from section 16.2 of the ie3d manual to (...)
Dears, Please help me to solve the problem of UWB antenna design , error message appeared to me when i pressed on simulation button and this message told me " The magentic current modeling with finite dielectrics has not been implemented." I attached file design and snap shoot for error message. Thanks,
can anyone pls suggest me how to select substrate dimension (finite) on ie3d 12.0
i've run several models (both monopole and dipole) using the vertical port definition and have gotten some impedance results that i just cant believe. what kind of considerations must i entertain when using the vertical port? i attached a typical model which has a vertical port defined from 100 mils to 0 mils with infinite GP at 0 mils. also
Dear h.f, here are some small guidelines, try not to use FEM codes such as HFSS except for small antennas otherwise the simulation time would be extremely long. The best software for this purpose are ie3d which has a trial version but does not support finite substrate (at least untill version 10) , CST Microwave studio and XFDTD. (...)
the feko online/user manual explains how to define an edge port.The example folder of feko also contains a few examples for an edge fed rectangular patch antenna. That is true but only for inifinite substrates. There are are no SEP examples with an edge port for a finite substrate!
Hi, Alberich: It looks like you use the infinite substrate model of ie3d for this antenna. It is excellent for antennas radiatng mainly in other than 90 degree angles. However, The null at 90 degree s caused by the infinite substrate. You may want to use finite substrate (...)
is it possible in momentum that we can specify a large metal box under a finite size substrate? Yes, you can define a finite sized box around your substrate.This box will have walls with perfect conductors. Look at drop down menu in layout: Momentum-->Box-Wavguide-->Add Box
Dears, I made design of UWB antenna with finite substrate and microstrip feed line , i want to know if there is any mistake in drawing (specially for finite substrate and port feed on edge) and the result of simulation takes much time , i attached file that have Hexagonal Antenna for UWB applications. UWB antenna (...)
How does to determine the dimensions of the substrate in ADS ? substrate size is simulated as infinite.
hi all,ater i put PML layers ,in quasi yagi design,there is an error i ignore it,i put it after i put air walls that due to limit ground and finite substrate.what is error in my design regards
Hi, jayanthi: Yes. Your antenna is radiating strongest at theta about 50-60 degrees. Why is it radiating the strongest at that angle? It really depends upon how the current distribuning on your structure. It is hard to give any simple explanation. The current is distributing in such a way that the radiation at the angle is the strongest. If you
I have been using FEKO to try to simulate a fat dipole antenna for wideband ground penetrating applications. Using the infinite green's function to model the substrate, air, then sand (in that order), I get very good results in the far field, 8 decibels max and very directive. However, when I try to use a finite substrate (...)
I think ie3d is faster than HFSS in analysing slot antennas. HFSS: finite elem. ie3d: MoM.
Does anyone know how to define edge ports for a finite substrate microstrip fed patch antenna.? Anyone who has tried it would know that port edges have to share faces and then there is the negative and positive face story to complicate matters. THe FEKO guidetries to explain but there is no example to show how it's done. Microstrip ports won'
Hi mr shern, in 5.2 you can replace the substrate with green functions (e.g. multi-layer substrate) and keep the finite PEC gnd plane. Waveguide port may only work at higher feko versions.(I'm not sure) From your diagram, which looks like a microstrip feed. You can create an additonal PEC plate that connects to the ground and the (...)
which package do you mean as EM simulator? It depends if you want to include the "edge of the substrate" effect, i.e. finite substrate size. Maybe it is good enough to simulate with infinite substrate size -> planar simulator like Momentum. do you have any idea to model it on
Here is what i learned from FEKO LITE: 1) Do not forget to make UNION, to connect all your microstrip+wire+ground. Select them all and press union. And their type must be CONDUCTOR. 2) When you using infinite substrate (Solution>Infinite Planes), it is easy to use microstrip port directly on your microstrip structure. 3) When you (...)
In ie3d help, you can find how to define finite ground plane. In the basic parameter menu, use sigma=0 for Ztop=0; it means that there is no infinite ground. Then you can define all the layer you need (please see the manual of ie3d).
You can define substrate, finite ground plane etc. in ie3d. In the help file of ie3d you can find example how to define all these.
I have a simple 8 dipole design I want to simulate using Zelands ie3d but I cannot see how you specify the tracks on two sides of the FR4 substrate. I can add substrates. OK I can add tracks. OK Basically its two "H" shapes like this: H H Where the top of the "H" (squared off U shape) is on the top of the PCB and bottom of the "H" (...)
HI Ansoft ensemble and ansoft designer are not suitable for simulation of structures with finite ground plan.ie3d is better.
If there is any way you can get hold of Agilent Momentum or Zeland ie3d, those will be much better tools for this problem. The infinite dielectric comes for free. No worry about PMLs and you just mesh the surface of the metal of your circuit. Excitation is very easy too, just specify a port and let it analyze. I view ie3d as faster and (...)
First of all I introduce myself. I am a student doing my thesis working in Antenas Design, and i dont know a lot of things about it. I have designed and simulated an antenna with the CST and ie3d software, using the Cuclad 217 as substrate.But in the next step i must use the EBG as substrate. Do you know how can I do this? Do I need (...)
Hi, Adhi: Here are some models (edge fed, infinite gnd & sub, finite gnd &/or sub) for the 8 GHz range. You can start from them. I do want to warn you on the substrate thickness. The 2nd order mode should happen at about 30 GHz for a 0.35 mm thick substrate. Even you can use edge fed, microstrip lines in this (...)
Hi everyone.I am a new user of ie3d program.I am good at drawing different structures.But i always have problems while adding substrate layers and metalic ones.I looked ie3d benchmark and tried to make the structures.For example substrate thickness = 0.127 mm, permittivity = 9.9, permeability = 1 Conductor thickness = (...)
For infinite gnd and substrate 1. You need to change the connector dia according to requirement. 2. Change feed impedance to 100 in Modua For finite gnd and substrate just draw the entire feed including inner and outer conductor of the coaxial probe. Hi to all, I am presently engaged in design of folded (...)
I have few doubts in simulating phaseshifters based on BST in ie3d * Can materials like BST (εr= 2100) be simulated in ie3d? * How to define finite dimensions of a dielectric substrate in ie3d, like for simulating a planar structure with dielectric covering only a small portion of the structure? It (...)
Hi, Pennylsn: It is simple. For example, you have draw the finite ground (or define an infinite ground) on z = 0. You also define the patch on z = 3 mm. You want to build a shorting plate from 3 to 0. What you can do is to select an edge of 2 vertices on the patch at z = 3. Select EDIT->ADD VIA ON EDGES command. Enter the END Z-COORDINATE = 0 an
Hi, Chest: From the look, it seems that it is modeing a finite ground patch in the manual while your built is modeling a patch on infinite ground. In order to make it finite ground, you need to define the No.0 layer's conductivity to 0 or some very small value, and put some polygon(s) to represent a finite ground before (...)
Hi, Kishorekumar: Normally, finite ground plane will degrade circular polarization. Best regards,
Hi, Chest: I don't see serious problem in your structure. I tried the finite ground plane model on it. It is slightly different from the infinite ground model. The difference is mainly due to the fact you chose very thin substrate for 10 GHz. In fact, there might be 2nd order mode in the transmission line due to the thick (...)
Hi, rc5: 1. There are some movies on the web site you can watch to see how ie3d is being used. 2. At this time, finite dielectrics is not implemented into the ie3dLIBRARY interface. You can only define them in MGRID. best regards,
Define Port or Port for Edge group --> Infinite Ground Plane. Vertical Localized Port or Probe Feed to Patch --> finite Ground Plane. I suggest you to read ie3d Manual where above things are well-explained with examples regards, balaguru.
I simulate an antenna with substrate of large thickness(more than 10mm at 10GHz), and use the infinite ground plane, and advanced extension port, so how can I set up the the port to avoid the warning " the substrate thickness factor for port is too big",and "the ground separation/length radio for port is too big", and could get the high (...)