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Update EM_simulation.md

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modules/module_2_50GHz_MPA/part_4_layout_EMsims/EM_simulation.md
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@ -286,7 +286,7 @@ For **multiport simulations**, the ports can be activated or deactivated within
### Importance of Common Ground in Port Placement
In openEMS, ports are always measured between the signal and ground, where the signal represents the active part of the port, such as a transmission line or a signal conductor, and the ground serves as the return path for the current, typically connected to a reference plane. When placing ports in a GDSII layout, it’s essential to position the signal and ground connections appropriately. The ground return must be on the same layer as the signal, or accessible via a via, depending on the port type. This is especially critical in complex designs where signal lines may span multiple layers or areas.
In openEMS, ports are always measured between the signal and ground, where the signal represents the active part of the port, such as a transmission line or a signal conductor, and the ground serves as the return path for the current, typically connected to a reference plane. When placing ports in a GDSII layout, it’s essential to position the signal and ground connections appropriately. The ground return must be on the same layer as the signal, or accessible through a via, depending on the port type. This is especially critical in complex designs where signal lines may span multiple layers or areas.
For via ports, which extend from one metal layer to another (e.g., from Metal3 to TopMetal2), it's important to ensure that the ground is present on the bottom layer or the nearest reference layer, such as the GND layer. If Metal3 is used for the signal, the ground for that signal should be located in the bottom metal layer or GND, which will serve as the return path. For in-plane ports, where both the signal and ground are on the same metal layer, the polarity of the ground needs to be set correctly, ensuring that it has the same effective polarity as the signal. Lets look at the example from above: