TLSCP2 simulates a transmission short-circuited line with isolated (floating) ground terminals. The characteristics of the transmission line are specified as physical length and electrical specification of the characteristic impedance and propagation constant. By default, this model provides partial account for circuit loss (insertion loss only). You can toggle the secondary parameter LossModel to obtain access to insertion loss, return loss, and dielectric loss (for example; for microstrips or stripline). Use extreme care with this element as it is meant to work in concert with additional elements which relate the voltages at ports of the transmission line to the global ground. Unusual and unexpected behavior can result if these additional elements are omitted.

Name | Description | Unit Type | Default |
---|---|---|---|

ID | Name | Text | TL1 |

Z0 | Transmission line impedance | Resistance | 50 ohm |

L | Transmission line length | Length | 0 um |

Eeff | Relative effective dielectric constant | 0 | |

Loss | Loss (db/meter) | 0 | |

F0 | Frequency for scaling losses | Frequency | 0 GHz |

*LossModel | Partial/Full account for conductor and dielectric loss | Partial | |

*TanD | Dielectric loss tangent | 0 | |

*Mur | Relative dielectric permeability | 1 | |

*TanM | Dielectric magnetic loss tangent | 0 | |

*Sigma | Dielectric bulk conductivity (S/m) | 0 | |

*EpsFreqDep | Dielectric constant is frequency dependent (No/Yes) | No | |

*Fmin | Low roll-off frequency of Tand frequency dependence | Frequency | 1kHz |

*Fmax | High roll-off frequency of Tand frequency dependence | Frequency | 1THz |

*Fspec | Er and Tand are specified at this frequency | Frequency | 1GHz |

`* indicates a hidden secondary parameter`

See the TLINP4 equivalent circuit.

Note that parameters marked by asterisk (*) are hidden/invisible while the control parameter LossModel=Partial (default value). Setting LossModel=Full displays these secondary parameters in the model's Element Options dialog box Parameters tab (except parameters Fmin, Fmax, and Fspec which are visible only when parameter EpsFreqDep=Yes).

**Loss** and **F0**. Determine the
frequency-dependence of the attenuation constant. If F0 is not equal to zero (0.0), then

(dB/m) where `freq`

is the evaluation frequency. If F0 is
equal to zero, the attenuation is constant versus frequency and is equal to Loss(dB/m).

**LossModel** is a secondary control parameter that defines how
the model accounts for loss and dielectric parameters. If LossModel=Partial (default value) then
the model accounts for insertion loss (parameter Loss) only. If LossModel=Full then the model
accounts for insertion loss, return loss, dielectric loss, and for frequency-dependent model of
dielectric parameters (for example, for microstrips, stripline, or other).

**NOTE:** The secondary parameter LossModel displays when you
click the Show or hide secondary parameters button on the toolbar of the the
Element Options dialog box Parameters tab. If LossModel=Full, additional
secondary parameters display.

**EpsFreqDep** is a (hidden, secondary) control parameter that
defines if dielectric constant and dielectric loss tangent exhibit predefined
frequency-dependence, suggested in [1]. This dependence is controlled by the three frequency
parameters Fmin, Fmax, and Fspec, and imparts causal behavior to the model. Fmin, Fmax, and Fspec
are hidden (invisible) if EpsFreqDep=No.

See the TLINP4 "Implementation Details" section.

This element does not have an assigned layout cell. You can assign artwork cells to any element. See “Assigning Artwork Cells to Layout of Schematic Elements” for details.

This model, along with additional components can be used to model transmission line baluns and transmission line transformers in which one of the conductors is shielded from ground, like a coaxial line.

**NOTE:** Because the model definition does not include
interactions with the ground, unusual and unexpected results can occur if other components are
not used to relate the voltage on both sides of the transmission line to ground.