Align modes analytically using coordinate system with U Axis Line in Circular Waveguides?

[engineer366]

Hello Again!
I want to define a wave_port on a circular waveguide with 2 modes and align the modes analytically using coordinate system with a Y-oriented U Axis Line and a reversed V Direction.
If I use the following code I get a simple integration line for Mode 1. this way after solving, the electric fields of Mode 1 and Mode 2 are not aligned to what I wanted. (they are 45 degrees rotated)
could you help me?
Also, no matter what I do, create_circle function makes a circle that is always Y-directed, and If I change the Orientation to Y or Z, my circle is always Y-directed in HFSS, so I hade to rotate it.

`PortOne=hfss.modeler.create_circle(orientation='X',
origin=[0 ,0 ,0],
radius="waveguide_diameter/2",
is_covered=True,
name="PortOne",
material="vacuum",
non_model=False)

PortOne = hfss.modeler["PortOne"]
hfss.modeler.rotate(PortOne,"X",angle=90,units='deg')
hfss.modeler.move(PortOne,[0 ,0 ,"-waveguide_length"])

y_start = [0, hfss.variable_manager["y_start"].evaluated_value, hfss.variable_manager["z_start_end"].evaluated_value]
y_end = [0, hfss.variable_manager["y_end"].evaluated_value , hfss.variable_manager["z_start_end"].evaluated_value]

hfss.wave_port(PortOne,
reference=None,
create_port_sheet=False,
create_pec_cap=False,
integration_line=[y_start, y_end],
port_on_plane=True,
modes=2,
impedance=50,
name="Port1",
renormalize=False,
deembed=0)`

[Samuelopez-ansys]

@engineer366 Please could you share the values of the variables? Then I could reproduce the issue. Please also attach a screenshot of the UI if possible

[engineer366]

really sorry for the late reply.
but when I use the above code, this is what I get:

the following picture is the integration line of the code:

in a circular waveguide the wave port for a 2 mode excitation should be like this:

Also for the above code to work:
`
hfss["waveguide_diameter"] = "18mm"

hfss["waveguide_length"] = "20mm"

hfss["y_start"] = "-waveguide_diameter/2"

hfss["y_end"] = "waveguide_diameter/2"

hfss["z_start_end"] = "-waveguide_length"
`

[Samuelopez-ansys]

Hi @engineer366 , with the new PyAEDT main is now possible. Next week we will create a new release (0.14.0).

You can see the unit tests:

tests/system/general/test_20_HFSS.py

The alignment and polarity is missed for now directly from the PyAEDT method, but you have 2 options:

Create 2 integration lines:

import ansys.aedt.core

app = ansys.aedt.core.Hfss(solution_type="Modal")

c = aedtapp.modeler.create_circle("XY", [-1.4, -1.6, 0], 1, name="wave_port")

start = [["-1.4mm", "-1.6mm", "0mm"], ["-1.4mm", "-1.6mm", "0mm"]]
end = [["-1.4mm", "-0.6mm", "0mm"], ["-1.4mm", "-2.6mm", "0mm"]]

p = aedtapp.wave_port(c.name, integration_line=[start, end], modes=2)

Define the second line with the mode alignment:

import ansys.aedt.core
from ansys.aedt.core.modules.boundary.common import BoundaryProps

app = ansys.aedt.core.Hfss(solution_type="Modal")

c = aedtapp.modeler.create_circle("XY", [-1.4, -1.6, 0], 1, name="wave_port")

start = ["-1.4mm", "-1.6mm", "0mm"]
end = ["-1.4mm", "-0.6mm", "0mm"]

p = aedtapp.wave_port(c.name, integration_line=[start, end], modes=2)
p.auto_update = False
p.props["UseAnalyticAlignment"] = True
analytical_line = {"Coordinate System": "Global", "Start": ["-2.4mm", "-1.6mm", "0mm"], "End": ["-0.4mm", "-1.6mm", "0mm"]}
new_props = BoundaryProps(p.props, analytical_line)
p.props["AnalyticULine"] = new_props
p.auto_update = True
p.update()

At the end, even if it is not implemented in PyAEDT, you can still use AEDT API, so if something is missed you can still use the AEDT API, of course we need your feedback with an Issue or Discussion to know which AEDT API commands are missed in PyAEDT, like this one :)

Hopefully this works for you
Samuel

[engineer366]

Wow! this actually works perfectly,
Thank you for your kind and fast response.
Regards.

[fwlfHS]

currently it is not possible to define multiple integration lines via the API, I've added an enhancement request earlier: #4887
To set the circle orientation to X you may use the integer value 0.
To access the value of a design variable you can directly access it via hfss['y_start'] which makes your code more readable.