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Antenna Cosite Interference

This example shows how to create a project in EMIT for the simulation of an antenna cosite interference scenario.

Keywords: EMIT, Antenna.

Prerequisites

Perform imports

import os
import tempfile
import time

import ansys.aedt.core
from ansys.aedt.core.emit_core.emit_constants import ResultType, TxRxMode
from ansys.aedt.core.emit_core.nodes.generated import AntennaNode, RadioNode

Define constants

Constants help ensure consistency and avoid repetition throughout the example.

AEDT_VERSION = "2026.1"
NG_MODE = False  # Open AEDT UI when it is launched.

Create temporary directory

Create a temporary working directory. The name of the working folder is stored in temp_folder.name.

Note: The final cell in the notebook cleans up the temporary folder. If you want to retrieve the AEDT project and data, do so before executing the final cell in the notebook.

temp_folder = tempfile.TemporaryDirectory(suffix=".ansys")

Launch application

Launch AEDT with EMIT. The Emit class initializes AEDT and creates an EMIT design in the project.

project_name = os.path.join(temp_folder.name, "antenna_cosite.aedt")
aedtapp = ansys.aedt.core.Emit(
    project=project_name,
    version=AEDT_VERSION,
    non_graphical=NG_MODE,
    new_desktop=True,
)

Model Preparation

Create radios and antennas and connect them in the EMIT schematic.

Create and connect EMIT components

Create a radio and connect an antenna to it.

rad1: RadioNode = aedtapp.schematic.create_component("New Radio")
ant1: AntennaNode = aedtapp.schematic.create_component("Antenna")
if rad1 and ant1:
    aedtapp.schematic.connect_components(rad1.name, ant1.name)

Place radio/antenna pairs

Use the create_radio_antenna() method to place additional radio/antenna pairs. The first argument is the type of radio. The second argument is the name to assign to the radio.

rad2, ant2 = aedtapp.schematic.create_radio_antenna("GPS Receiver")
rad3, ant3 = aedtapp.schematic.create_radio_antenna("Bluetooth Low Energy (LE)", "Bluetooth")

Define the RF environment

Specify the RF coupling among antennas. This functionality is not yet implemented in the API, but it can be entered from the UI.

Run analysis

Run the EMIT simulation.

if AEDT_VERSION > "2023.1":
    rev = aedtapp.results.analyze()

Postprocess

Evaluate the worst-case EMI between the GPS receiver and Bluetooth radio.

if AEDT_VERSION > "2023.1":
    rx_bands = rev.get_band_names(radio_node=rad2, tx_rx_mode=TxRxMode.RX)
    tx_bands = rev.get_band_names(radio_node=rad3, tx_rx_mode=TxRxMode.TX)
    domain = aedtapp.results.interaction_domain()
    domain.set_receiver(rad2.name, rx_bands[0], -1)
    domain.set_interferer(rad3.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))

Finish

Save the project

aedtapp.save_project()
aedtapp.release_desktop()
# Wait 3 seconds to allow AEDT to shut down before cleaning the temporary directory.
time.sleep(3)

Clean up

All project files are saved in the folder temp_folder.name. If you’ve run this example as a Jupyter notebook, you can retrieve those project files. The following cell removes all temporary files, including the project folder.

temp_folder.cleanup()

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Download this example

Download this example as a Jupyter Notebook or as a Python script.