Create symmetric stackup (#1034)

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Author: hui-zhou-a

_unittest/test_00_EDB.py

@@ -1099,3 +1099,15 @@ def test_84_create_coax_port_on_component_pin(self):
     def test_85_deactivate_rlc(self):
         assert self.edbapp.core_components.deactivate_rlc_component(component="C1", create_circuit_port=True)
         assert self.edbapp.core_components.deactivate_rlc_component(component="C2", create_circuit_port=False)
+
+    def test_86_create_symmetric_stackup(self):
+        from pyaedt import Edb as local_edb
+
+        app_edb = local_edb(edbversion="2022.1")
+        assert not app_edb.core_stackup.create_symmetric_stackup(9)
+        assert app_edb.core_stackup.create_symmetric_stackup(8)
+        app_edb.close_edb()
+
+        app_edb = local_edb(edbversion="2022.1")
+        assert app_edb.core_stackup.create_symmetric_stackup(8, soldermask=False)
+        app_edb.close_edb()

pyaedt/edb_core/stackup.py

@@ -762,3 +762,78 @@ def stackup_limits(self, only_metals=False):
             )
         h_stackup = abs(float(topz) - float(bottomz))
         return topl.GetName(), topz, bottoml.GetName(), bottomz
+
+    def create_symmetric_stackup(
+        self,
+        layer_count,
+        inner_layer_thickness="17um",
+        outer_layer_thickness="50um",
+        dielectric_thickness="100um",
+        dielectric_material="FR4_epoxy",
+        soldermask=True,
+        soldermask_thickness="20um",
+    ):
+        """Create a symmetric stackup.
+
+        Parameters
+        ----------
+        layer_count : int
+            Number of layer count.
+        inner_layer_thickness : str, float, optional
+            Thickness of inner conductor layer.
+        outer_layer_thickness : str, float, optional
+            Thickness of outer conductor layer.
+        dielectric_thickness : str, float, optional
+            Thickness of dielectric layer.
+        dielectric_material : str, optional
+            Material of dielectric layer.
+        soldermask : bool, optional
+            Whether to create soldermask layers. The default is``True``.
+        soldermask_thickness : str, optional
+            Thickness of soldermask layer.
+        Returns
+        -------
+        bool
+        """
+        if not layer_count % 2 == 0:
+            return False
+
+        if soldermask:
+            self.stackup_layers.add_layer("SMB", None, "SolderMask", thickness=soldermask_thickness, layerType=1)
+            layer_name = "BOTTOM"
+            self.stackup_layers.add_layer(layer_name, "SMB", fillMaterial="SolderMask", thickness=outer_layer_thickness)
+        else:
+            layer_name = "BOTTOM"
+            self.stackup_layers.add_layer(layer_name, fillMaterial="Air", thickness=outer_layer_thickness)
+
+        for layer in range(layer_count - 1, 1, -1):
+            new_layer_name = "D" + str(layer - 1)
+            self.stackup_layers.add_layer(
+                new_layer_name, layer_name, dielectric_material, thickness=dielectric_thickness, layerType=1
+            )
+            layer_name = new_layer_name
+            new_layer_name = "L" + str(layer - 1)
+            self.stackup_layers.add_layer(
+                new_layer_name, layer_name, "copper", dielectric_material, inner_layer_thickness
+            )
+            layer_name = new_layer_name
+
+        new_layer_name = "D1"
+        self.stackup_layers.add_layer(
+            new_layer_name, layer_name, dielectric_material, thickness=dielectric_thickness, layerType=1
+        )
+        layer_name = new_layer_name
+
+        if soldermask:
+            new_layer_name = "TOP"
+            self.stackup_layers.add_layer(
+                new_layer_name, layer_name, fillMaterial="SolderMask", thickness=outer_layer_thickness
+            )
+            layer_name = new_layer_name
+            self.stackup_layers.add_layer("SMT", layer_name, "SolderMask", thickness=soldermask_thickness, layerType=1)
+        else:
+            new_layer_name = "TOP"
+            self.stackup_layers.add_layer(
+                new_layer_name, layer_name, fillMaterial="Air", thickness=outer_layer_thickness
+            )
+        return True