Chip Antenna -- Two nets to one pad? | Altium Net Tie

Question

I've got a doozy of an Altium question:

I've got a chip antenna (2mm x 2mm or something like that).

The datasheet of the chip antenna calls for a 50 ohm line (in red in the graphic)

It also calls for a GND line (in blue) that intersects the 50 ohm trace.

Supposing I draw this layout in Solidworks and import it as a top layer fill, so the geometry of the traces are correct?

How would you assign the nets and/or layout the pads to the top layer fill of this shape?

I've tried creating the separate fill and it seems you can't assign just a chunk of the top layer fill to a net.

In this post showing a kind of similiar issue, what did the user do here to create those pad points? Did he just create a top layer pad and drop it on the fill?

This is like a pro-grade Altium problem.

Answer 1

The way I solved this was creating a DWG of the traces I wanted. I then created pads that represent the feed points.

(Just imagine that 6 is the GPS feed, 7 is the GPS GND feed, and 5 is where both of the signals meet.) 1,2,3 are the Wifi feed. Pads 4 and 4 are the ANT GND.

Originally, I thought I would use the top layer fill, but that ends up creating a PCB trace antenna. The signals actually need to be traces that end up at pads.

You can see in the schematic symbol, that I created the ANT GND by using two pads. I think I probably will just make it one.

For the traces, I'll probably connect them using a polygon. Unfortunately, you can't define a net using the fills, which is why I am just left with pads.

If you select "net tie" when you create the schematic symbol, Altium will let you "short" (ie. you can merge the nets) in the PCB editor.