EMIT: HFSS to EMIT coupling

This example shows how you can use PyAEDT to open an AEDT project with an HFSS design, create an EMIT design in the project, and link the HFSS design as a coupling link in the EMIT design.

Perform required imports

Perform required imports.

sphinx_gallery_thumbnail_path = “Resources/emit_hfss.png”

import os

# Import required modules
import pyaedt
from pyaedt.generic.filesystem import Scratch
from pyaedt.emit_core.emit_constants import TxRxMode, ResultType

Set AEDT version

Set AEDT version.

aedt_version = "2024.1"

Set non-graphical mode

Set non-graphical mode. You can set non_graphical either to True or False. The Boolean parameter new_thread defines whether to create a new instance of AEDT or try to connect to an existing instance of it.

The following code uses AEDT 2023 R2.

non_graphical = False
NewThread = True
scratch_path = pyaedt.generate_unique_folder_name()

Launch AEDT with EMIT

Launch AEDT with EMIT. The Desktop class initializes AEDT and starts it on the specified version and in the specified graphical mode.

d = pyaedt.launch_desktop(aedt_version, non_graphical, NewThread)

temp_folder = os.path.join(scratch_path, ("EmitHFSSExample"))
if not os.path.exists(temp_folder):
    os.mkdir(temp_folder)

example_name = "Cell Phone RFI Desense"
example_aedt = example_name + ".aedt"
example_results = example_name + ".aedtresults"
example_lock = example_aedt + ".lock"
example_pdf_file = example_name + " Example.pdf"

example_dir = os.path.join(d.install_path, "Examples\\EMIT")
example_project = os.path.join(example_dir, example_aedt)
example_results_folder = os.path.join(example_dir, example_results)
example_pdf = os.path.join(example_dir, example_pdf_file)

C:\actions-runner\_work\_tool\Python\3.10.9\x64\lib\subprocess.py:1072: ResourceWarning: subprocess 6396 is still running
  _warn("subprocess %s is still running" % self.pid,
C:\actions-runner\_work\pyaedt\pyaedt\testenv\lib\site-packages\pyaedt\generic\settings.py:383: ResourceWarning: unclosed file <_io.TextIOWrapper name='D:\\Temp\\pyaedt_ansys.log' mode='a' encoding='cp1252'>
  self._logger = val

If the Cell Phone RFT Defense example is not in the installation directory, exit from this example.

if not os.path.exists(example_project):
    msg = """
        Cell phone RFT Desense example file is not in the
         Examples/EMIT directory under the EDT installation. You cannot run this example.
        """
    print(msg)
    d.release_desktop(True, True)
    exit()

my_project = os.path.join(temp_folder, example_aedt)
my_results_folder = os.path.join(temp_folder, example_results)
my_project_lock = os.path.join(temp_folder, example_lock)
my_project_pdf = os.path.join(temp_folder, example_pdf_file)

if os.path.exists(my_project):
    os.remove(my_project)

if os.path.exists(my_project_lock):
    os.remove(my_project_lock)

with Scratch(scratch_path) as local_scratch:
    local_scratch.copyfile(example_project, my_project)
    local_scratch.copyfolder(example_results_folder, my_results_folder)
    if os.path.exists(example_pdf):
        local_scratch.copyfile(example_pdf, my_project_pdf)

aedtapp = pyaedt.Emit(my_project)

Create and connect EMIT components

Create two radios with antennas connected to each one.

rad1, ant1 = aedtapp.modeler.components.create_radio_antenna("Bluetooth Low Energy (LE)")
rad2, ant2 = aedtapp.modeler.components.create_radio_antenna("Bluetooth Low Energy (LE)")

Define coupling among RF systems

Define coupling among the RF systems.

for link in aedtapp.couplings.linkable_design_names:
    aedtapp.couplings.add_link(link)

for link in aedtapp.couplings.coupling_names:
    aedtapp.couplings.update_link(link)

Run EMIT simulation

Run the EMIT simulation.

This part of the example requires Ansys AEDT 2023 R2.

if aedt_version > "2023.1":
    rev = aedtapp.results.analyze()
    rx_bands = rev.get_band_names(rad1.name, TxRxMode.RX)
    tx_bands = rev.get_band_names(rad2.name, TxRxMode.TX)
    domain = aedtapp.results.interaction_domain()
    domain.set_receiver(rad1.name, rx_bands[0], -1)
    domain.set_interferer(rad2.name,tx_bands[0])
    interaction = rev.run(domain)
    worst = interaction.get_worst_instance(ResultType.EMI)
    if worst.has_valid_values():
        emi = worst.get_value(ResultType.EMI)
        print("Worst case interference is: {} dB".format(emi))

Worst case interference is: 90.0 dB

Save project and close AEDT

After the simulation completes, you can close AEDT or release it using the pyaedt.Desktop.force_close_desktop() method. All methods provide for saving the project before closing.

aedtapp.save_project()
aedtapp.release_desktop(close_projects=True, close_desktop=True)

True