Implementation of Stackup for heatsinks with cavity in MWO

I have a card Board 2 layer FR4 based on a heat sink.

The metal top of the page and the metal bottom of the FR4 substrate have traces of RF with vias connecting them. Since there are structures of RF and vias to the bottom layer, to avoid it being shorted with the heat sink aluminum, then you must put a cavity of 1 mm on the radiator.

the installation would be as below;

Open the top cover
high metal
FR4 substrate
metal background (GND with RF lines)
heatsink (with cavities)
Open the bottom cover

Please see presentation here;

http://ImageShack.us/photo/my-images/259/cavity.jpg/

Question is how configure you the envelope or for this stackup in MWO?

Hey boom,.

The trick is to think of the throat as cut in aluminium by layer.  Here's how to set your envelope:

In "material Defs." tab, include aluminum as a conductor

In 'Dielectric layers ':

1 air (thickness x FR4 maybe 5)

2 FR4

3 air (thicker that the depth of the Groove you plough in the heat sink)

Upper limit: about open;   Background limit: aluminium

In "Materials", add an entry for aluminum, any thickness.

In the layout, draw a "Via" with "extended" from the 1 on the dielectric layer 3 using aluminum material.  The shapes you draw defines the coverage of the area where the Groove is not present.  You can also copy these forms, change their material to what is on the bottom of your Board (not like the "Via") and you cover them existing.  For an example, see the attachment.

I did a "quick and dirty" job on it, exactly as if you were only using AXIEM. If you also use MWO for presentation and general circuit design and want to be able to use these layers there as well, then you must add the necessary drawing layers and map for EM for extraction.

If this answers your question, please identify yourself as a solution.

Tags: NI Products

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