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Physical Spec: Grounded Shield, Open, Improved Accuracy (Closed Form): TLOCP



TLOCP simulates an ideal open-circuited transmission line with loss. Mode propagating in line is specified by its effective dielectric constant and per-unit-length attenuation at a user-specified frequency. This model scales loss with evaluation frequency. You can toggle the secondary parameter LossModel to access insertion loss, return loss, and dielectric loss (for example; for microstrips or stripline).


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   1
Loss Loss (dB/m)   0 GHz
F0 Frequency for scaling loss    
*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

Parameter Details

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.


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.


[1] A.R. Djordjevic et al., "Wideband Frequency-Domain Characterization of FR-4 and Time-Domain Causality", IEEE Trans. of Electromagn. Compat., Vol. 43, No. 4, Nov. 2001

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