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Re: HFSS: Coplanar waveguide simulation - hf3d error
Hi,
defining a wave port for CPW even mode need too take into account different aspects such your CPW aspect ratio. A simple way to define ports for CPW is to use Lumped ports. I recommend you to review the following thread (specially the...
Hi Ferdinand some questions:
First of all what do you mean by no success? What result do you expect to obtain?
Second question: What do you mean when you talk about that the "parasitic capacitance of the box was causing the problem there"
Hi,
very interesting post. I have been thinking in something similar in the past. The problem you have is that your way to connect your separate grounds is affecting your structure.
One way I found is to connect separate grounds using the outer air box. What I mean is that you can use the air...
Hi,
You can maintain your CPW even mode impedance just redesigning central conductor and slots width. Unfortunatly this is more complicated for your slotline mode as this mode impedance will depend mainly on the slotline gap and your substrate properties (if slotline strips are thinner they can...
Hi, you need to pass from a umbalanced mode to a balanced one. The balum will depend on the acces TL do you have. Are you looking for CPW-to-Slotline transition?
marco
Hi,
you have to include your SPDT switch S parameter within a 3 port Data Item into your phase shifter schematic. S parameter(that have to be imported into the data item, touchstone format .s3p) have to correspond to the SPDT switch state that you want to simulate. Then you could run a second...
Hi Alice,
the software has not to be suitablefor MEMS fabrication. What I mean is that what you send for mask fabrication in almost all the IC process (including MEMS process) is a GDS file. In that sense you have a lot of layout editors that allow you to draw MEMS devices and export GDS file...
Hi,
this is a planar antenna that can be easily modeled with Momentum. You have to excite it with a single port. shorts between vertical point have to be done with via layers, shorts between horizontal points could be done by means of air-bridges (almost equivalent to wire bonding).
Regards
Marco
Hi monolothics,
you could insert within a Dataset the S param from the SPDT part into your schematic. Of course you nedd two diferrent sets of S param for both states of the SPDT.
this technique can be also useful for cosimualtion with momentum.
Regards
Marco
Hi Iban,
the fact that there are some lines of the E field coupling to the back side ground plane is just a matter of how your CPW is designed (in my opinion that doesn't means that you have CPW even mode and ustrip mode propagating together as one mode). What I mean if as you mention you...
Hi,
from my point of view it is possible to integrate this into your model. You have to take into account that you are going to have a metal to metal contact that can not be modeled (Contact resistance depends on various parameters as material properties, roughness, ....), but you can define a...
Hi,
I'm not an expert with CST but in my opinion...
1) No, mode order doesn't implies importance
2) If they are excited yes they always propagate
3) In my opinion the CBCPW normal mode of propagation is the even mode and not a combination of different modes.
4) For port impedance solver use to...
If you are looking to work seriously with the tool you have to spend time, not just going through tutorials and more tutorials but really understanding what you are doing... I believe that is a lot of work depending on your background.
Highly desirable to have an electromagnetic background...
I'm not sure what do you mean ...
but If you are referring to how to demonstrate that a certain propagation mode has a certain cut-off frequency you have just to excite this mode and simulate it on the frequency range of interest.
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