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26 Threads found on edaboard.com: Finite Ads
Hello, I am currently trying to simulate an output balun for a power amplifier with ads Momentum. I am having trouble with some ports for the DC-blocking capacitors though. I set up the simulation with a finite ground plane and want to simulate with ports for the blocking caps on both the ground plane and the microstrip line on the unbalanced si
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 conductor: sheet (oper
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
Hello htung, Agilent Momentum uses formulation of Method of Moments (MoM) & this assumes that substrates go to infinity in all directions (X,Y)... You can't model finite substrate block in Momentum... You can enter Er of dielectric, Height of dielectric, thickness of the conductor, Loss Tangent for EM simulations... ---manju---
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(
hello hafizm, what do you want to know? ads considers substrate as infinite where as in CST its always finite. I can see you have three ports in ads. How you defined it? are they differential or what? It would be better if you clarify what you are simulating. Perheps a paper from which you designing the antenna. Take a (...)
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.
I am trying to simulate a cpw-fed quasi yagi antenna using ads momentum but the results that I am taking doesn't match with the theoriticaly ones. the antenna consists of a microstip and two parts of finite ground plane. Can anyone help?
Hi, everyone. I have a question about the ads Momentum finite ground plane simulation. I know that in order to get a good results for the software based on MOM, a infinite ground plane is needed. However, I also want to try the finite ground plane simulation in ads Momentum. However, it seems when I (...)
Iam currently working on ads Momentum2003A for antenna design Can anyone suggest How to Create finite ground plane in ads? Also suggest some good papers reg UWB Antennas that can be implemented using ads 2003A
I want to know what's the 2D and 3D finite element analysis? What's the differnece and advantages of each over the other? Is there a Free tool online that perform these analysis? Can ads alo do? How if yes? Are they important for VHF or only higher frequency? Thanks for your help, Regards, Ahmad,
Hi It acts as a perfect short at DC and all other frequencies, it behave as an open circuit(∞ impedance at any AC signal). Ordinary inductors has a finite L value, a DC feed inductor has an inductance value of L=∞. Regards
it includes: ads for microstrip demo Boundary Intergral Equation Coupling between a Microstrip Trace Pair.pdf finite Element Mehtod for Eigenvalue problems.pdf Microstrip between lines.pdf Microstrip Conductor Loss_models Mar03.pdf microstrip filter.pdf mirostripline_capacitor_decoupling.pdf mtt2002_mstrip.pdf Physical Optics Approximatio