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In HFSS, you can set a surface roughness boundary on the walls of the cavity. You can either define the roughness, or define a conductivity. I am not sure about CST.
Good Luck
Depending on your design/freq/etc. you may be able to run the DC/low freq on the RF line, then just use RF and DC blocks to tap of the DC where you need it. That has worked decently for me on higher frequency boards where I can put quarterwave shorts, etc. Never the less, it is another idea...
There are plenty of examples in the ADS\examples directory ( or root\examples\Momentum\Optimization has some good filter examples as well). Also, if you have the licenses to use the design guide (it is called something like that), then you can enter in your filter specs, and it will crank out a...
room simulation in hfss
On your printed antenna, I would change a couple things. First, you need more room between the end of your antenna and any type of Radiation or PML boundary. Second, I would highly recommend a PML over the radiation, but that is your call. Third, I would add thickness...
First, draw your schematic as you described, and place a s-parameter engine. Then, define the inductor value as a variable, such as "my_L". Then, place a "VAR" block from your tool bar, and define the variable "my_L = 1" (it doesn't really matter what value you give it, you just need to...
Are you using all ~40 dielectric layers and 8 metal layers, or can you simplify it? For instance, if you have a ground plane on the 4th metal layer, then you would only need to include half of your layers.
Or, as was previously stated, if the material is the same or similar, you should be able...
Re: why ref terminal of layout disappear co-simulaton in ADS
It is now an option. I don't remember off hand where the option is to check, but I believe that it is when you are creating the component. By default, the ref is now connected to the schematic gnd. If you need something else, you...
er fr4
FR4 is pretty lossy for any RF applications, but sometimes the cost is worth the loss. There are plenty of other cheap materials though that you can use in your stack that will have much less loss.
Dielectric constant (permittivity) 4.70 max, 4.35 @ 500 MHz, 4.34 @ 1 GHz...
Spaces in ADS
It is still fun when ever you get a chance to ask the Agilent reps if they can handle the space character when ever they are pitching the new versions. It is just an ASCII character after all.
wilkinson combiner ads momentum
I think that you have it set up pretty good, I would just change a couple things. First, for the ports, go into the port editor, and assign the ground ports to "ground reference" ports, and then link them to your signal ports.
Second, I would draw the physical...
Re: phase shifter in ADS
You probably need to elaborate a little to get some more insight. But this may help out a little.
I did a switched path phase shifter in ADS for a MMIC. In that case, the hardest part was creating a good FET switch model. Once that is done, and you are fairly...
In ADS layout, you use variables by moving vertices. So, if you would like to increase the width of your rectangle, you grab the two corresponding vertices, and move those by the desired amount. If you current width is X, you can specify the variable to have a nominal value of X with a...
gerber export in ads
I haven't had much luck with any of the ADS artwork exports. All of them seem to have some issue or another. I found that my best option was to purchase a 3rd party translator, such as LinkCAD. If I remember right, it was less than ~1K, and has plenty of options. I...
ephysics 3
I was told by our Ansoft rep that HFSS 11 doesn't integrate with ePhysics v2. ePhysics v3 is due out soon, and should play nice together with HFSS v11. I haven't tried it, but that is what I was told.
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