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how design CPw with strips in ADS?

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shazdek0ch0l0

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Dear,
I was drawn below figure in ADS, but i dont know why this circuit has error on MACLIN block?!

it is a cpw feed line with 3ple strips.
the strips connect to CPW with MACLIN because the space between strips are important, but this circuit cannot be run in ADS.

Can you help me?

12straight.png
 

MACLIN3 is a microstrip model and needs an MSUB block (not CPWSUB).
 

Is there any similar block like MACLINE3 for cpw structures?

how can i change my structure?
 

There are only few waveguide schematic models.

90_1325251422.png


I think your approach might be wrong.
What are you trying to model/layout?
Do you have an EM simulator available (Momentum, Sonnet etc.)?
 

I want to model three straight strip that connected to the cpw feed on one layer. The figure like below. I cant get the answer yet. this circuit works in triple frequency. i was modeled it at HFSS and got the result.
 
Last edited:

Hmmm ... there are certainly no circuit models to simulate this properly. You have to model this with an EM simulator.
Personally, I would not use HFSS for this planar work, but that's your choice.

If this is not GCPW, i.e. no other ground below, what is it? Antenna?
 

which package do you mean as EM simulator?
yes, it is antenna, and work at 3ple frequencies, a single strip at cpw between two others is main feed and two other strips in cpw used at ground. the straight strips are equal to lambda/4 and work at certain frequency
do you have any idea to model it on ADS?
 

shazdek0ch0l0 said:
which package do you mean as EM simulator?
Click to expand...

It depends if you want to include the "edge of the substrate" effect, i.e. finite substrate size.
Maybe it is good enough to simulate with infinite substrate size -> planar simulator like Momentum.

shazdek0ch0l0 said:
do you have any idea to model it on ADS?
Click to expand...

Forget about the circuit models. Draw the structure in layout, then simulate with Momentum.
 

It is good idea, but I think if i can draw in layout it means i can plot design model!
i dont draw before in layout, doesnt layout need MACLINE?
just like a photo that i uploaded i draw some strips?
how define CPW?

---------- Post added at 18:06 ---------- Previous post was at 18:05 ----------

i was heard before, we can export from layout to circuit model, is it true? and how can i do this?
 

shazdek0ch0l0 said:
i dont draw before in layout, doesnt layout need MACLINE?
Click to expand...

You do not need auto-generated layout!
You can simply draw polygons in layout, and then do EM analysis with Momentum.

shazdek0ch0l0 said:
how define CPW?
Click to expand...

Before you start, look at the Momentum CPW examples. For CPW, Momentum uses a special port type where you draw (and mesh) the slots instead of the mesh. But I am not a Momentum user, so I can not help you with the details.

shazdek0ch0l0 said:
i was heard before, we can export from layout to circuit model, is it true? and how can i do this?
Click to expand...

This is true if you place transmission line models in layout, instead of simple polygons.
This does not work for your layout, because there are no circuit models. You need to draw with simple polygons and then use Momentum.
 

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