RF MODULE

integration coupling variables. This causes the warnings for inconsistent units here
and in the specification of the refractive index. You can disregard these warnings.
COUPLING VARIABLES
The unknown parameters e0, e1, and e2 should be constant within the whole modeling
domain. You can achieve this by defining coupling variables that map these dependent
variables from the point to the entire model:
1 Switch to Geom2 by clicking its tab.
2 Open the Point Integration Variables dialog box by selecting Integration Coupling
Variables>Point Variables from the Options menu.
3 Enter the following names and expressions, each on a separate row in the table on
the Source page.
NAME EXPRESSION
e00 e0
e11 e1
e22 e2
The variables e00, e11, and e22 take the values of e0, e1, and e2, respectively, in the
entire model.
SUBDOMAIN SETTINGS
Finally, enter the additional terms in the generalized plane strain problem.
1 Switch to Geom1 by clicking its tab.
2 Select Equation System>Subdomain Settings from the Physics menu.
3 On the Weak tab in the Subdomain Settings - Equation System dialog box, add
-E/((1+nu)*(1-2*nu))*(ex_test*nu*ez+ey_test*nu*ez)-ez_test*sz in
the second row of the weak term for all subdomains. The two first rows correspond
to the plane strain problem. You can enter this expression in any of these two fields,
because the software adds them together when assembling the problem.
4 Click OK.
MESH GENERATION
1 Initialize the mesh by clicking the Initialize Mesh button on the Main toolbar.
2 Refine it twice by clicking the Refine Mesh button on the Main toolbar twice.
3 Switch to Geom2 by clicking its tab.
288 | CHAPTER 4: OPTICS AND PHOTONICS MODELS