EDB: fully parametrized CPWG design

This example shows how you can use HFSS 3D Layout to create a parametric design for a CPWG (coplanar waveguide with ground).

Perform required imports

Peform required imports. Importing the Hfss3dlayout object initializes it on version 2022 R2.

import pyaedt
import os
import numpy as np

Set non-graphical mode

Set non-graphical mode. The default is False.

non_graphical = os.getenv("PYAEDT_NON_GRAPHICAL", "False").lower() in ("true", "1", "t")

Launch EDB

Launch EDB.

aedb_path = os.path.join(pyaedt.generate_unique_folder_name(), pyaedt.generate_unique_name("pcb") + ".aedb")
print(aedb_path)
edbapp = pyaedt.Edb(edbpath=aedb_path, edbversion="2022.2")

D:\Temp\pyaedt_prj_HDU\pcb_8EPHAS.aedb

Define parameters

Define parameters.

params = {"$ms_width": "0.4mm",
          "$ms_clearance": "0.3mm",
          "$ms_length": "20mm",
          }
for par_name in params:
    edbapp.add_design_variable(par_name, params[par_name])

Create stackup

Create a symmetric stackup.

edbapp.stackup.create_symmetric_stackup(2)

True

Draw planes

Draw planes.

plane_lw_pt = ["0mm", "-3mm"]
plane_up_pt = ["$ms_length", "3mm"]

top_layer_obj = edbapp.core_primitives.create_rectangle("TOP", net_name="gnd",
                                                        lower_left_point=plane_lw_pt,
                                                        upper_right_point=plane_up_pt)
bot_layer_obj = edbapp.core_primitives.create_rectangle("BOTTOM", net_name="gnd",
                                                        lower_left_point=plane_lw_pt,
                                                        upper_right_point=plane_up_pt)
layer_dict = {"TOP": top_layer_obj,
              "BOTTOM": bot_layer_obj}

Draw trace

Draw a trace.

trace_path = [["0", "0"], ["$ms_length", "0"]]
edbapp.core_primitives.create_trace(trace_path,
                                    layer_name="TOP",
                                    width="$ms_width",
                                    net_name="sig",
                                    start_cap_style="Flat",
                                    end_cap_style="Flat"
                                    )

<pyaedt.edb_core.edb_data.primitives_data.EDBPrimitives object at 0x0000028BF54A57C0>

Create trace to plane clearance

Create a trace to the plane clearance.

poly_void = edbapp.core_primitives.create_trace(trace_path, layer_name="TOP", net_name="gnd",
                                                width="{}+2*{}".format("$ms_width", "$ms_clearance"),
                                                start_cap_style="Flat",
                                                end_cap_style="Flat")
edbapp.core_primitives.add_void(layer_dict["TOP"], poly_void)

True

Create ground via padstack and place ground stitching vias

Create a ground via padstack and place ground stitching vias.

edbapp.core_padstack.create_padstack(padstackname="GVIA",
                                     holediam="0.3mm",
                                     paddiam="0.5mm",
                                     )

yloc_u = "$ms_width/2+$ms_clearance+0.25mm"
yloc_l = "-$ms_width/2-$ms_clearance-0.25mm"

for i in np.arange(1, 20):
    edbapp.core_padstack.place_padstack([str(i) + "mm", yloc_u], "GVIA", net_name="GND")
    edbapp.core_padstack.place_padstack([str(i) + "mm", yloc_l], "GVIA", net_name="GND")

Save and close EDB

Save and close EDB.

edbapp.save_edb()
edbapp.close_edb()

True

Open EDB in AEDT

Open EDB in AEDT.

h3d = pyaedt.Hfss3dLayout(projectname=os.path.join(aedb_path, "edb.def"), specified_version="2022.2",
                          non_graphical=non_graphical)

Create wave ports

Create wave ports.

h3d.create_edge_port("line_3", 0, iswave=True, wave_vertical_extension=10, wave_horizontal_extension=10)
h3d.create_edge_port("line_3", 2, iswave=True, wave_vertical_extension=10, wave_horizontal_extension=10)

<pyaedt.modules.Boundary.BoundaryObject3dLayout object at 0x0000028BEC340F40>

Edit airbox extents

Edit airbox extents.

h3d.edit_hfss_extents(air_vertical_positive_padding="10mm",
                      air_vertical_negative_padding="1mm")

True

Create setup

Create an HFSS simulation setup.

setup = h3d.create_setup()
h3d.create_linear_count_sweep(
    setupname=setup.name,
    unit="GHz",
    freqstart=0,
    freqstop=10,
    num_of_freq_points=1001,
    sweepname="sweep1",
    sweep_type="Interpolating",
    interpolation_tol_percent=1,
    interpolation_max_solutions=255,
    save_fields=False,
    use_q3d_for_dc=False,
)

<pyaedt.modules.SetupTemplates.SweepHFSS3DLayout object at 0x0000028BEC2A0BB0>

Plot layout

Plot layout

h3d.modeler.edb.core_nets.plot(None, None, color_by_net=True)

Start HFSS solver

Start the HFSS solver by uncommenting the h3d.analyze_nominal() command.

# h3d.analyze_nominal()

# Save AEDT
h3d.save_project()

# Release AEDT.
h3d.release_desktop()

aedt_path = aedb_path.replace(".aedb", ".aedt")
print("****************************************",
      "***Your AEDT project is save to " + aedt_path,
      "****************************************",
      sep="\n")

****************************************
***Your AEDT project is save to D:\Temp\pyaedt_prj_HDU\pcb_8EPHAS.aedt
****************************************