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Filter design

This section describes the classes used for creating and modifying parameters in the filtersolutions module. The module provides tools for designing and customizing filter configurations.

The module includes two classes, LumpedDesign and DistributedDesign, both inherited from the FilterDesignBase class as described in the :ref:`BaseFilterDesign` section.

Each class implements methods specific to its design approach while leveraging common functionality from the base class.

Lumped design

The LumpedDesign module includes all the necessary classes for creating and modifying parameters used in lumped filter designs. Lumped filters use discrete components such as capacitors, inductors, and resistors.

  • LumpedTopology to define attributes and parameters of filters implemented using a lumped topology.
  • LumpedParasitics to define attributes of parasitic values associated with lumped elements.
  • LumpedNodesandLeads to define attributes of the lumped node capacitors and lead inductors.
  • LumpedTerminationImpedance to manage access to the entries in the source and load complex impedance table.

They are accessible through:

.. currentmodule:: ansys.aedt.core.filtersolutions_core


.. autosummary::
   :toctree: _autosummary
   :nosignatures:


   lumped_topology.LumpedTopology
   lumped_parasitics.LumpedParasitics
   lumped_nodes_and_leads.LumpedNodesandLeads
   lumped_termination_impedance_table.LumpedTerminationImpedance

Lumped Filter example:

import ansys.aedt.core
import ansys.aedt.core.filtersolutions
from ansys.aedt.core.filtersolutions_core import FilterClass, FilterType

# This call returns an instance of the LumpedDesign class
design = ansys.aedt.core.filtersolutions.LumpedDesign(version= "2025.2")
# This property in the Attributes class specifies the filter class as band pass
design.attributes.filter_class = FilterClass.BAND_PASS
# This property in the Attributes class specifies the filter type as elliptic
design.attributes.filter_type = FilterType.ELLIPTIC
# This property in the LumpedTopology class enables the trap topology by setting it to true
design.topology.trap_topology = True
...

Distributed design

The DistributedDesign module includes all the necessary classes for creating and modifying parameters used in distributed filter designs. Distributed filters rely on transmission lines and resonators.

  • DistributedTopology to define attributes and parameters of filters implemented using a distributed topology.
  • DistributedSubstrate to define attributes and parameters of the substrate used in distributed filters.
  • DistributedGeometry to define attributes and parameters of the substrate geometry used in distributed filters.
  • DistributedRadial to define attributes and parameters of the substrate radial used in distributed filters.
  • DistributedParasitics to define attributes and parameters of parasitic values associated with lumped elements.

They are accessible through:

.. currentmodule:: ansys.aedt.core.filtersolutions_core


.. autosummary::
   :toctree: _autosummary
   :nosignatures:


   distributed_topology.DistributedTopology
   distributed_substrate.DistributedSubstrate
   distributed_geometry.DistributedGeometry
   distributed_radial.DistributedRadial
   distributed_parasitics.DistributedParasitics

Distributed Filter example:

import ansys.aedt.core
import ansys.aedt.core.filtersolutions
from ansys.aedt.core.filtersolutions_core import FilterClass, FilterType

# This call returns an instance of the DistributedDesign class
design = ansys.aedt.core.filtersolutions.DistributedDesign(version= "2025.2")
# This property in the Attributes class specifies the filter class as band pass
design.attributes.filter_class = FilterClass.BAND_PASS
# This property in the Attributes class specifies the filter type as Elliptic
design.attributes.filter_type = FilterType.ELLIPTIC
# This property in the DistributedTopology class sets the load resistance to 50 ohms.
design.topology.load_resistance = "50"
...

Base filter design

The FilterDesignBase module provides all the essential classes for creating and modifying the primary parameters applicable to all design types.

  • Attributes to define attributes and parameters of filters.
  • GraphSetup to define the frequency and time graph parameters of the exported responses.
  • IdealResponse to return the data for the available ideal filter responses.
  • MultipleBandsTable to manage access to the entries in the multiple bands table.
  • TransmissionZeros to manage access to ratio and bandwidth entries in the transmission zeros table.
  • ExportToAedt to define attributes and parameters for the export page when exporting to AEDT.
  • OptimizationGoalsTable to manage access to the entries in the optimization goals table.

They are accessible through:

.. currentmodule:: ansys.aedt.core.filtersolutions_core


.. autosummary::
   :toctree: _autosummary
   :nosignatures:


   attributes.Attributes
   graph_setup.GraphSetup
   ideal_response.IdealResponse
   multiple_bands_table.MultipleBandsTable
   transmission_zeros.TransmissionZeros
   export_to_aedt.ExportToAedt
   optimization_goals_table.OptimizationGoalsTable