Maxwell SV Getting Started: A 2D Electrostatic Problem - LES

Getting Started: A 2D Electrostatic Problem
Assign a Material to the Microstrips and Ground Plane
Now you can assign materials to the microstrips and ground. which are the conductors.
To assign materials to the conductors:
1. Click Multiple Select at the top of the window, if it is not already enabled.
2. Do one of the following to select left, right, and ground from the Object list:
• Press and hold down Ctrl, and then click each of the object names.
• Press and hold down Shift, and then drag the pointer over the object names.
To deselect an object, click it.
3. Click perf_conductor in the Material list.
4. Click Assign.
The microstrips and the ground plane have now been assigned the properties of a perfect conductor
(a good approximation of which is copper). Also, perf_conductor appears next to those objects’
names.
Note The potentials on the surfaces of conductors are specified with the Setup Boundaries/
Sources command that is described later in this chapter.
Assigning Materials to the Background
The background object is the only object that is assigned a material by default. Include it as part of
the problem region in which to generate the solution. When a material name — such as vacuum —
appears next to background in the Objects list, the background object is included as part of the
solution region.
Because the model is assumed to be surrounded by a vacuum, accept the default material, vacuum,
for the background.
Note In some cases, such as when all objects and electromagetic fields of interest are contained
within an enclosure, including the background as part of the problem region wastes
computing resources. It also prevents you from setting boundary conditions defining an
external electric or magnetic field for the model.
In these cases, you can manually exclude the background from the solution.
5-4 Defining Materials and Boundaries