How to import .amat file for EDB use in Python?

[bchapman23]

I am trying to write a Python script that will automatically generate a stackup, then create some traces/vias/ports etc. However, for my stackup, I need to import certain materials that the default syslib does not have. Is there a way to have the EDB object import an .amat file (containing the material info needed) that will then work correctly with functions like edb.stackup.add_layer?

[hui-zhou-a]

Hi @bchapman23, you can load .amat by
edb.materials.load_amat(mat_file)

Alternatively, you can use edb.configuration.load. Here is a complete example

# Import Materials

This example shows how to import materials.

### Import the required packages

+

import json
from pathlib import Path
import tempfile

from IPython.display import display
import pandas as pd
from pyaedt.downloads import download_file

from pyedb import Edb

AEDT_VERSION = "2024.1"
NG_MODE = False

-

### Download the example PCB data.

temp_folder = tempfile.TemporaryDirectory(suffix=".ansys")
file_edb = download_file(source="edb/ANSYS-HSD_V1.aedb", destination=temp_folder.name)

### Load example layout.

edbapp = Edb(file_edb, edbversion=AEDT_VERSION)

### Review materials from layout

Get materials from layout in a dictionary. Materials are exported together with stadckup.

data_cfg = edbapp.configuration.get_data_from_db(stackup=True)

df = pd.DataFrame(data=data_cfg["stackup"]["materials"])
display(df)

### Add a new material

data_cfg["stackup"]["materials"].append(
{"name": "soldermask", "permittivity": 3.3, "dielectric_loss_tangent": 0.02},
)

### Edit existing material properties

data_cfg["stackup"]["materials"][1]["name"] = "fr4_epoxy"
data_cfg["stackup"]["materials"][1]["dielectric_loss_tangent"] = 0.015

### Review modified materials

df = pd.DataFrame(data=data_cfg["stackup"]["materials"])
display(df)

### Write material definition into a json file

file_cfg = Path(temp_folder.name) / "edb_configuration.json"
with open(file_cfg, "w") as f:
json.dump(data_cfg, f, indent=4, ensure_ascii=False)

### Load materials from json configuration file

edbapp.configuration.load(str(file_cfg), apply_file=True)

### Review materials from layout

edbapp.materials.materials

### Check modified material properties

edbapp.materials["fr4_epoxy"].loss_tangent

### Close EDB

edbapp.close()

[bchapman23]

Thank you very much for the detailed reply!