FIX: Improve Variable management in Circuit

doc/changelog.d/6742.fixed.md

@@ -0,0 +1 @@
+Improve Variable management in Circuit

src/ansys/aedt/core/application/design.py

@@ -4056,8 +4056,12 @@ def get_evaluated_value(self, name, units=None):
             if self.design_type in ["Circuit Design", "Twin Builder", "HFSS 3D Layout Design"]:
                 if name in self.get_oo_name(app, f"Instance:{self._odesign.GetName()}"):
                     var_obj = self.get_oo_object(app, f"Instance:{self._odesign.GetName()}/{name}")
+                elif name in self.get_oo_name(app, "Variables"):
+                    var_obj = self.get_oo_object(app, f"Variables/{name}")
                 elif name in self.get_oo_object(app, "DefinitionParameters").GetPropNames():
-                    val = self.get_oo_object(app, "DefinitionParameters").GetPropEvaluatedValue(name)
+                    val = self.get_oo_object(app, "DefinitionParameters").GetPropSIValue(name)
+            elif self.design_type in ["Maxwell Circuit"]:
+                return None
             else:
                 var_obj = self.get_oo_object(app, f"Variables/{name}")
         if var_obj: