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26 Threads found on edaboard.com: Finite Ads
First, you can not use any passive/active component in ads Momentum EM simulations Second, what is your intention to use finite ground underneath of the structure ?? Will it be covered by any GND environment ?? ?? Why not infinite ground ?? Third, there are many "close-in" ports, have you ever select calibration mode well ?? If the (...)
Usually, simulation tools allow visualizing the fields that are simulated. For example, for capacitive coupling, electric field lines would tell where capacitance is coming from (in finite element or finite difference method based tools), or a surface charge density (in boundary element tools). Very often just viewing the structure - in 2D (top vi
Hello, I am simulating on momentum/ads 2012 a CPW transmission line with finite ground planes. I am wondering if my substrate is well defined. I selected : - for the top layer: strip layer (I define then two ports connected to the conductor and I associate to them their 4 ground ports (2 for each one)) - for the conduc
Yeah I ve used your advise and disable the calibration and move the pin a bit in.like this: It is difficult to see the scale here, so we can't see what "a bit" is. Just to avoid misunderstanding: I only suggested to switch off calibration because your previous setup (different pin locations) doesn't work with
You will never be able to resolve abrupt edges as you illustrate. There has to be some finite rise/fall time to then be able to fit sufficient simulation time steps to that transition to extract suitable marker points. In this example I have 500 psec rise time and 1 psec set as the MaxTimeStep. Also using a delay of the step source to move the edge
Hi, I am new to rf design. I'm trying to design a 4 layer PCB. the stack-up looks like this: 1.GND 2.Power 3.signal 4.GND the data rate in layer 3 (signal layer) is about 16 GHz. What do I have to consider? I mean, what is the best method (draw finite GNDs? vias between layer 1 and 4?) in ads Momentum 2013. I would like to get p
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 I'm looking for example of designing an IFA in ads and how to define a finite ground. any help? best regards
Usually, The ground plane in the simulation of ads is defined is infinity ground plane. It can not check in the F/B ratio. You can draw a finite size ground, instead of using the ground boundary condition. Then, you can easily simulate the F/B ratio. Limitation: The substrates are assumed infinite in this case. [C
Regarding F/B ratio in ads, I don't know whether there is an automatic calculation feature. First, you need to change the model so that the patch antenna back plane is simulated with a finite, drawn metal instead of the bottom boundary condition. Adjust the Momentum stackup so that you have two drawn metal layers (for
1-why Momentum(ads) works with an infinite ground plane? The advantage is that these infinite planes (=boundary conditions) are available "for free", without having to mesh a "drawn" ground plane. This is more efficient for memory and simulation time. we can define a finite ground plane
How does to determine the dimensions of the substrate in ads ? Substrate size is simulated as infinite.
Hello, I'm currently designing a Patterned (w/ Slots) Marchand Balun to increase the Even/Odd Impedance Ratio for good balance. LineCalc is able to simulate Zoe and Zoo given the width and spacing of a coupled lines but it assumes an infinite ground plane. However, for the patterned ground plane, the LineCalc would not be applicable. Any i
CST MWS is not suitable for large structure. It is based on finite integration Technique and uses volume discretization. I think, you should use ads Momentum of FEKO Software. They are based on the Moment Method. Also, if you are familiar with Ansoft HFSS, so you can use Floque boundary condition to overcome this probl
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
In Momentum, the size of the substrate is infinite. Always. The size of the bottom ground is also infinite if you use the //// GND //// ground boundary condition. If you want to simulate with a finite ground, you can draw that and map it in the EM layer stackup and then use FreeSpace boundary above and below. But for patch antennas that (...)
Hi, everyone I just begin to learn ads. i want to design a 50ohm coplanar waveguide with finite ground. I know the linecalc in ads can be use to obtain the gap and wide value of infinite CPW. Is this tool still valid to for CPW with finite ground? I have seen dr_em(
The two results differ simply because the use two different EM simulation techniques. ads MoM based on 3D planar EM technique considers substrate of infinite height while the real 3D FIT EM technique is the core kernel of CST.
why do i always get a positive return loss for my pifa 1800 design on a finite GROUND PLANE. I am using agilent ads. the result is not real..i mean a positive return loss
I think IE3D is faster than HFSS in analysing slot antennas. HFSS: finite elem. IE3D: MoM.


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