tidy3d.LinearLumpedElement#

class LinearLumpedElement[source]#

Bases: RectangularLumpedElement

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

Parameters:

attrs (dict = {}) – Dictionary storing arbitrary metadata for a Tidy3D object. This dictionary can be freely used by the user for storing data without affecting the operation of Tidy3D as it is not used internally. Note that, unlike regular Tidy3D fields, attrs are mutable. For example, the following is allowed for setting an attr obj.attrs['foo'] = bar. Also note that Tidy3D` will raise a TypeError if attrs contain objects that can not be serialized. One can check if attrs are serializable by calling obj.json().
center (Union[tuple[Union[float, autograd.tracer.Box], Union[float, autograd.tracer.Box], Union[float, autograd.tracer.Box]], Box] = (0.0, 0.0, 0.0)) – [units = um]. Center of object in x, y, and z.
size (Union[tuple[Union[pydantic.v1.types.NonNegativeFloat, autograd.tracer.Box], Union[pydantic.v1.types.NonNegativeFloat, autograd.tracer.Box], Union[pydantic.v1.types.NonNegativeFloat, autograd.tracer.Box]], Box]) – [units = um]. Size in x, y, and z directions.
name (ConstrainedStrValue) – Unique name for the lumped element.
num_grid_cells (Optional[PositiveInt] = 3) – 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.
voltage_axis (Literal[0, 1, 2]) – 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.
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.
network (Union[RLCNetwork, AdmittanceNetwork]) – The linear element produces an equivalent medium that emulates the voltage-current relationship described by the network field.
dist_type (Literal['off', 'laterally_only', 'on'] = on) – Switches between the different methods for distributing the lumped element over the grid.

Notes

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

References

Example

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

See also

Notebooks:

Using lumped elements in Tidy3D simulations

Attributes

attrs

Methods

`admittance`(freqs)	Returns the admittance of this lumped element at the frequencies specified by `freqs`.
`estimate_parasitic_elements`(grid)	Provides an estimate for the parasitic inductance and capacitance associated with the connections.
`impedance`(freqs)	Returns the impedance of this lumped element at the frequencies specified by `freqs`.
`to_PEC_connection`(grid)	Converts the `LinearLumpedElement` object to a `Structure`, representing any PEC connections.
`to_structure`(grid)	Converts the `LinearLumpedElement` object to a `Structure`, which enforces the desired voltage-current relationship across one or more grid cells.
`to_structures`(grid)	Converts the `LinearLumpedElement` object to a list of `Structure` which are ready to be added to the `Simulation`

Inherited Common Usage

network#

dist_type#

An advanced feature for LinearLumpedElement is the ability to choose different methods for distributing the network portion over the the Yee grid. When set to on, the network portion of the lumped element is distributed across the entirety of the lumped element’s bounding box. When set to off, the network portion of the lumped element is restricted to one cell and PEC connections are used to connect the network cell to the edges of the lumped element. A third option exists laterally_only, where the network portion is only distributed along the lateral axis of the lumped element.

When using a dist_type other than on additional parasitic network elements are introduced, see below. Thin connections lead to a higher inductance, while wide connections lead to a higher parasitic capacitance. Follow the link to the associated notebook for an example of using this field.

tidy3d.LinearLumpedElement

Contents

tidy3d.LinearLumpedElement#