flex_rf.tidy3d.LinearLumpedElement

Type: class │ Base(s): RectangularLumpedElement

Description

Lumped element representing a network consisting of resistors, capacitors, and inductors.

Notes

Implementation is based on the equivalent medium introduced by [1].

Example(s)

RL_series = RLCNetwork(resistance=75,  # doctest: +SKIP
                       inductance=1e-9,
                       network_topology="series"
            )
linear_element = LinearLumpedElement(  # doctest: +SKIP
                        center=[0, 0, 0],
                        size=[2, 0, 3],
                        voltage_axis=0,
                        network=RL_series,
                        name="LumpedRL"
                  )

References

[1] J. A. Pereda, F. Alimenti, P. Mezzanotte, L. Roselli and R. Sorrentino, “A new algorithm for the incorporation of arbitrary linear lumped networks into FDTD simulators,” IEEE Trans. Microw. Theory Tech., vol. 47, no. 6, pp. 943-949, Jun. 1999.

Parameters

size [TracedSize]

Size in x, y, and z directions.

name [str]

Unique name for the lumped element.

voltage_axis [Axis]

Specifies the axis along which the component is oriented and along which the associated voltage drop will occur. Must be in the plane of the element.

network [NetworkType]

The linear element produces an equivalent medium that emulates the voltage-current relationship described by the network field.

center [TracedCoordinate] = (0.0, 0.0, 0.0)

Center of object in x, y, and z.

num_grid_cells [PositiveInt | None] = DEFAULT_LUMPED_ELEMENT_NUM_CELLS

Number of mesh grid cells associated with the lumped element along each direction. Used in generating the suggested list of MeshOverrideStructure objects. A value of None will turn off mesh refinement suggestions.

enable_snapping_points [bool] = True

When enabled, snapping points are automatically generated to snap grids to key geometric features of the lumped element for more accurate modelling.

snap_perimeter_to_grid [bool] = True

When enabled, the perimeter of the lumped element is snapped to the simulation grid, which improves accuracy when the number of grid cells is low within the element. Sides of the element perpendicular to the voltage_axis are snapped to grid boundaries, while the sides parallel to the voltage_axis are snapped to grid centers. Lumped elements are always snapped to the nearest grid boundary along their normal_axis, regardless of this option.

dist_type [LumpDistType] = 'on'

Switches between the different methods for distributing the lumped element over the grid.

Methods

admittance(freqs: np.ndarray)

Returns the admittance of this lumped element at the frequencies specified by freqs.

estimate_parasitic_elements(grid: Grid)

Provides an estimate for the parasitic inductance and capacitance associated with the connections. These wire or sheet connections are used when the lumped element is not distributed over the voltage axis.

impedance(freqs: np.ndarray)

Returns the impedance of this lumped element at the frequencies specified by freqs.

to_PEC_connection(grid: Grid)

Converts the LinearLumpedElement object to a Structure, representing any PEC connections.

to_structure(grid: Grid, frequency_range: FreqBound | None = None)

Converts the LinearLumpedElement object to a Structure, which enforces the desired voltage-current relationship across one or more grid cells.

to_structures(grid: Grid, frequency_range: FreqBound | None = None)

Converts the LinearLumpedElement object to a list of Structure which are ready to be added to the Simulation. Passes frequency_range through to to_structure; for CircuitImpedanceModel networks, if omitted, the model’s freq_range is used (e.g. after injection by TerminalComponentModeler).