HFSS lumped RLC boundary issue

[idoy26]

Hi everyone,
I'm trying to create a parametric sweep of different capacitance values for an RLC boundary condition in HFSS using PyAEDT. I'm loading the capacitance values from a CSV file, but I'm having trouble linking the imported values to the RLC boundary condition parameter.

here's what I've tried:

hfss['capacitance'] = '1p' # create HFSS variable for the cap value

rlc_params = {
                "resistance": None,
                "inductance": None,
                "capacitance": hfss["capacitance"] # use the HFSS variable holding the cap value for the boundary
            }
        
        
hfss.assign_lumped_rlc_to_sheet("load", start_direction=hfss.AxisDir.XNeg, name="rlc", **rlc_params) # assign boundary

# Define the ranges and steps for each parameter
theta_range = [0]   
phi_range = [0] 
patch_size_range = [0.7*unitcell_size] 
cap_val_range = [0.01, 0.1, 1, 10]


# Specify the output CSV file name
output_file = r"C:\Users\yakirid\Documents\Thesis\HFSS python scripts\patch_sweep_parameters.csv"

# Generate the data
rows = []
headers = ["theta_inc", "phi_inc", "patch_size", "capacitance"]

for theta in theta_range:
    for phi in phi_range:
        for patch_size in patch_size_range:
            for cap_value in cap_val_range:
                row = [f"{theta}deg", f"{phi}deg", f"{patch_size}mm", f"{cap_value}p"]
                rows.append(row)

# Write to the CSV file
with open(output_file, mode="w", newline="") as file:
    writer = csv.writer(file)
    writer.writerow(headers)  # Write the header
    writer.writerows(rows)    # Write the data rows

# Create setup
setup = hfss.create_setup("patch_setup")
setup.props["Frequency"] = str(freq)+"GHz"
setup.props["MaximumPasses"] = 10 
setup.update()
hfss.parametrics.add_from_file(r'C:\Users\yakirid\Documents\Thesis\HFSS python scripts\patch_sweep_parameters.csv', name = 'patch_sweep')

When I run the analysis I see that the HFSS variable is updated correctly but the problem is that in the RLC boundary the value is constant (the default 1pF defined at the beginning).

I've also tried defining the rlc_params this way:

rlc_params = {
                "resistance": None,
                "inductance": None,
                "capacitance": "capacitance" # use the HFSS variable holding the cap value for the boundary
            }

but it causes an error.

Manually changing the value inside HFSS to the variable name (and removing the units) works but that kind of ruins the automation.

Is there a way to link the HFSS variable into the capacitance value of the RLC boundary?

[RobPasMue]

Transferring discussion to PyAEDT repository

[Samuelopez-ansys]

Hi @idoy26 ,

I would use the object oriented programming capabilities of PyAEDT:

bound = self.aedtapp.assign_lumped_rlc_to_sheet(rect.name, start_direction=self.aedtapp.AxisDir.XNeg, name="rlc", **rlc_params)

bound.properties["Capacitance"] = "capacitance"

Then the boundary will be updated with the parameter :)