Global Definitions - Parameters
The geometry is set up using a parameterized approach. This allows you to match the input impedance to that of the connecting waveguide sections by variation of two geometric design parameters. These are dimensionless numbers used to scale selected geometric building blocks.
In this section, multiple parameters are entered to prepare for characterizing the ferrite material properties and drawing the circulator geometry which is described in the section Geometry Sequence. Alternatively, a predefined application library file containing the geometry and parameters can be imported, as described in Geometry. If you import the geometry, you only need to review this section for information.
1
In the Home toolbar click Parameters  and select Parameter 1.
Note: On Linux and Mac, the Home toolbar refers to the specific set of controls near the top of the Desktop.
2
In the Settings window under Parameters 1, enter the following parameters shown in the table below.
Here, e_const, me_const, and mu0_const are predefined COMSOL constants for the elementary charge, the electron mass, and the permeability of vacuum, respectively.