I am modelling a magnetic loop antenna system that will eventually have more than one loop. Starting off with a single loop made from a copper torus and a subtracted gap, when I add a lumped port it generates an unexpected pre-processing error when adding voltages. I am unsure if this error is actually from the port or from another geometry problem. I have not used this software before but I have used HFSS, although a long time ago. This is almost certainly something straightforward that I am just not doing correctly. None of the examples are of a similar type of arrangement.
Here is the file.
Many thanks for any input.
From your project, it appears that the lumped port surface (the rectangular port) is floating in the vacuum rather than being attached to a 3D object. In InventSim, a lumped port must always be defined on the surface of a 3D object. If the port is not attached to a 3D geometry surface, the solver may report an error.
To resolve this, simply create a small box (it can also be assigned the vacuum material) and define the lumped port on one of its faces, as shown in the picture attached.