TerminalComponentModeler

These advanced fields belong to tidy3d.rf.TerminalComponentModeler (opens new window).

Remove DC Component

remove_dc_component: Toggle whether to remove the DC component in the Gaussian pulse spectrum.

• Type: Boolean
• Options:
  • True: Modify the Gaussian pulse at low frequencies to zero out the DC component.
  • False: Keep the unmodified Gaussian pulse spectrum.
• Default: True

NOTE

• Set remove_dc_component to True for narrowband or resonant simulations when low-frequency signal content is not important.
• Set remove_dc_component to False for broadband or signal-integrity simulations when low-frequency signal content is important.

Assume Ideal Excitation

assume_ideal_excitation: Toggle how incident wave amplitudes are computed for S-parameter calculation.

• Type: Boolean
• Options:
  • True: Assume only the excited port has nonzero incident wave amplitude.
  • False: Calculate incident wave amplitudes explicitly at every port.
• Default: False

Use True when only a selected subset of port simulations is run.

S-Parameter Definition

s_param_def: Wave definition used to compute scattering parameters.

• Options:
  • Pseudo: Use the pseudo-wave definition.
  • Power: Use the power-wave definition.
  • Symmetric pseudo: Use the symmetric pseudo-wave definition.
• Default: Pseudo

When the reference impedance is purely real, all three definitions produce the same S-matrix. The differences matter when Z_ref is complex.

Definition	$S_{12} = S_{21}$ for reciprocal networks	Condition for $S_{11} = 0$	Passive $\lvert S_{11} \rvert \le 1$
Pseudo waves	No	$Z_\mathrm{in} = Z_\mathrm{ref}$, impedance match	No
Power waves	Yes	$Z_\mathrm{in} = Z_\mathrm{ref}^{*}$, conjugate match	Yes
Symmetric pseudo waves	Yes	$Z_\mathrm{in} = Z_\mathrm{ref}$, impedance match	No

See S-Parameter Definitions (opens new window).

Structure Priority Mode

structure_priority_mode: Priority mode used for structures with no explicit priority.

• Options:
  • conductor: Give conductive structures higher priority.
  • equal: Assign the same priority to structures without an explicit value.
• Default: conductor

Run Only

run_only: Optional list of S-matrix indices that define which port simulations to run.

• Options:
  • None: Run all simulations needed for the full S-matrix.
  • Selected entries: Run only the selected S-matrix entries.
• Default: None

S-parameter Symmetry

element_mappings: S-matrix element mappings used to skip simulations whose results can be inferred from another matrix element.

Each mapping relates an input element, output element, and complex coefficient.

Custom Source Time

custom_source_time: Optional custom source time dependence used for the RF excitations.

• Default: None

See Custom Source Time for available waveform options, formulas, parameters, and example time-domain and frequency-domain plots.

Low Frequency Smoothing

low_freq_smoothing: Optional low-frequency smoothing parameters used by the terminal component simulation.

• Default: None

See Low Frequency Smoothing for the smoothing model and parameters.