ADS 2009 layout multilyer question

[saeedbayanlou]

Hi everybody
how to draw the attached structure in the ADS layout?

Thanks in advance

 

[BigBoss]

You got 3 metal layers and no GND.So you should use "stripline" configuration in substrate definition.
For big hole, you should use "boolean" property of layout editor.

 

[RealAEL]

Definitely what BigBoss says.

For the middle layer draw the two shapes, the outline and the inner cut-out shape and then use "Edit > Merge > Union Minus Intersection" to create the overall polygon.



It is not possible to draw eliptical shapes directly. In this cas draw a circle with diameter of l and then convert it to a polygon (Edit > Modify > Convert To Polygon). Next use scaling (Edit > Scale/Oversize > Scale...) to change the height smaller to Dm or larger to Ds as required. This should create a polygon with the closest outline.

 

[al_dddd]

you should define the strip-line ports also, IMHO.

 

[volker_muehlhaus]

You got 3 metal layers and no GND.

I would think that the center layer is the ground in this circuit.

If we want to create the regular layout, draw the layout as RealAEL has described. But obviously, there are no circuit/schematic models to simulate this type of layout, and we need to use EM analysis.
For efficient EM analysis with Momentum, the "simulation layout" would be created differently than the "regular" layout: In Momentum, you can map the ground as a "slot" layer instead of a "strip" layer. This with mesh the slot instead of the metals, and use a "magnetic current" approach for more efficient simulation. To use this slot layer simulation, you need to draw the layout where there is NO metal. In your case, you draw the hole instead of the metal.


Top and bottom layer: map as strip layer, draw condutors
Middle ground layer: map as slot layer, draw hole

 

[saeedbayanlou]

Thank you all
I have attached the layout drawn by myself, but didnt get the expected results:sad: ANY SUGGESTION?
Best regards

 

[BigBoss]

I would think that the center layer is the ground in this circuit.

If we want to create the regular layout, draw the layout as RealAEL has described. But obviously, there are no circuit/schematic models to simulate this type of layout, and we need to use EM analysis.
For efficient EM analysis with Momentum, the "simulation layout" would be created differently than the "regular" layout: In Momentum, you can map the ground as a "slot" layer instead of a "strip" layer. This with mesh the slot instead of the metals, and use a "magnetic current" approach for more efficient simulation. To use this slot layer simulation, you need to draw the layout where there is NO metal. In your case, you draw the hole instead of the metal.


Top and bottom layer: map as strip layer, draw condutors
Middle ground layer: map as slot layer, draw hole

What is the exact theory behind of this idea ??
I draw as you said-I hopefully understood you well

 

[volker_muehlhaus]

What is the exact theory behind of this idea ??

Do you know the way how Momentum models CPW with "magnetic currents" and slot layer mapping, rather than electric current and strip layer mapping? My suggestion was to apply the same thing here. In your layout, the outer frame on the ground layer should be removed, because that layer is the INVERSE of metal and your drawn ring would correspond to a slot.

However, I am not a Momentum user myself and might have missed some difficulty in port setup for mixed strip/slot layers. So if it doesn't make sense, just go with the "normal" strip layer configuration as saeedbayanlou has already simulated.

 

[Element_115]

Thank you all
I have attached the layout drawn by myself, but didnt get the expected results:sad: ANY SUGGESTION?
Best regards



View attachment 77886

The drawing looks like it's a capacitor, so the output file looks reasonable. What are you trying to make ?

 

[saeedbayanlou]

It's an UWB 30 degree phase shifter.

 

[Element_115]

It's an UWB 30 degree phase shifter.

Ok.
From the graphs you have I would say that if you made the circle ~ twice as big
you will get less Insertion loss and better return loss (if that's what you need).
Also you should show a plot of your phase. You may have a good design for shifting
30° over your desired bandwidth.

 

[amitsinghjiit]

Hi saeedbayanlou,

If its a 30 deg phase shifter, then the S parameters results should be like



Notice that the insertion loss should be minimum, as this shows good power transfer and low losses. also S(1,1) and Phase(S(2,1)), should show UWB characteristics as it should be 30 deg phase shift from 1-2 for a wide band.

Now meaning of UWB according to FCC is 3.1 GHz to ~10.6 GHz. Also from the figure I can tell you that you have created wrong slot layer, notice that the oval shape in the diagram is perpendicular to the upper and lower patch oval shape. you can correct it and re-check the design.

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Amit
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