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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

RF, Microwave, Antennas and Optics :: 02-14-2017 15:39 :: zangcn :: Replies: **6** :: Views: **492**

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

Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 11-13-2016 02:21 :: timof :: Replies: **2** :: Views: **459**

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

RF, Microwave, Antennas and Optics :: 06-13-2016 10:44 :: alice12 :: Replies: **7** :: Views: **719**

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

Electromagnetic Design and Simulation :: 12-03-2014 08:14 :: volker@muehlhaus :: Replies: **10** :: Views: **2373**

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

ASIC Design Methodologies and Tools (Digital) :: 05-03-2014 00:43 :: RealAEL :: Replies: **7** :: Views: **737**

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

PCB Routing Schematic Layout software and Simulation :: 04-15-2014 13:44 :: ala_einstein82 :: Replies: **0** :: Views: **915**

Yes, it uses in**finite** 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..

RF, Microwave, Antennas and Optics :: 09-30-2013 19:42 :: BigBoss :: Replies: **2** :: Views: **719**

Hi
I'm looking for example of designing an IFA in **ads** and how to define a **finite** ground.
any help?
best regards

RF, Microwave, Antennas and Optics :: 05-20-2013 16:10 :: Bou :: Replies: **0** :: Views: **406**

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 in**finite** in this case.
[C

Electromagnetic Design and Simulation :: 11-06-2012 16:20 :: volker_muehlhaus :: Replies: **5** :: Views: **1591**

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

RF, Microwave, Antennas and Optics :: 09-28-2012 11:39 :: volker_muehlhaus :: Replies: **6** :: Views: **612**

hi.
1-why Momentum(**ads**) works with an in**finite** ground plane? we can define a **finite** ground plane? fo see for example the wave diffraction at the edges of the ground plane, is not more accurate whenwe work with **finite** plane (its reality )?
2-I le**ads** to simulate a circuit in momentum (...)

Electromagnetic Design and Simulation :: 06-14-2012 12:05 :: Abu Maria. :: Replies: **6** :: Views: **1385**

How does to determine the dimensions of the substrate in **ads** ?
Substrate size is simulated as in**finite**.

RF, Microwave, Antennas and Optics :: 04-16-2012 17:32 :: volker_muehlhaus :: Replies: **8** :: Views: **1111**

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 in**finite** ground plane.
However, for the patterned ground plane, the LineCalc would not be applicable. Any i

Electromagnetic Design and Simulation :: 11-30-2011 16:59 :: Blue_Electrons :: Replies: **2** :: Views: **1700**

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

Electromagnetic Design and Simulation :: 10-26-2011 11:22 :: abdoeng :: Replies: **6** :: Views: **2184**

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

RF, Microwave, Antennas and Optics :: 05-20-2011 15:42 :: BigBoss :: Replies: **9** :: Views: **3201**

In Momentum, the size of the substrate is in**finite**. Always.
The size of the bottom ground is also in**finite** 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 (...)

RF, Microwave, Antennas and Optics :: 05-12-2011 08:46 :: volker_muehlhaus :: Replies: **1** :: Views: **1461**

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 in**finite** CPW. Is this tool still valid to for CPW with **finite** ground?
I have seen dr_em(

Electromagnetic Design and Simulation :: 08-10-2010 13:12 :: orangemay :: Replies: **0** :: Views: **2428**

The two results differ simply because the use two different EM simulation techniques. **ads** MoM based on 3D planar EM technique considers substrate of in**finite** height while the real 3D FIT EM technique is the core kernel of CST.

Electromagnetic Design and Simulation :: 07-30-2010 11:16 :: saq_kaleem :: Replies: **3** :: Views: **1462**

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

RF, Microwave, Antennas and Optics :: 04-05-2009 22:37 :: ceejero :: Replies: **1** :: Views: **759**

I think IE3D is faster than HFSS in analysing slot antennas.
HFSS: **finite** elem.
IE3D: MoM.

RF, Microwave, Antennas and Optics :: 10-13-2008 10:45 :: si14 :: Replies: **8** :: Views: **2580**

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?

Electromagnetic Design and Simulation :: 03-18-2008 21:48 :: asturias :: Replies: **0** :: Views: **1365**

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 in**finite** ground plane is needed. However, I also want to try the **finite** ground plane simulation in **ads** Momentum.
However, it seems when I (...)

RF, Microwave, Antennas and Optics :: 06-26-2007 00:57 :: winglj :: Replies: **7** :: Views: **7795**

u hav to model a **finite** ground plane
in edaboard itself good papers on uwb antennas are posted ..or u should go through Mic and Opt. Tech Letters and IEEE journals

RF, Microwave, Antennas and Optics :: 04-01-2007 07:03 :: akedar :: Replies: **3** :: Views: **1421**

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,

RF, Microwave, Antennas and Optics :: 07-13-2006 12:13 :: ahmad_abdulghany :: Replies: **0** :: Views: **1124**

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

RF, Microwave, Antennas and Optics :: 11-21-2005 16:39 :: tyassin :: Replies: **4** :: Views: **4160**

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

Electromagnetic Design and Simulation :: 06-01-2004 17:33 :: zcrlr :: Replies: **0** :: Views: **1272**

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