MM1LIN models a section of single microstrip line having a conductor strip placed on the upper surface of a two-layered substrate. Lower layer of the substrate may have conductive loss.
Acc. The parameter Acc is the accuracy parameter. The default value for Acc is 1. If Acc is less than 1 or greater than 10 it is set automatically to 2.
Accuracy parameter Acc is limited to 1 ≤ Acc ≤ 10 . Larger value of Acc increases density of mesh used in computations. Accuracy of model parameters may gain slightly from increasing Acc at the expense of noticeable growth of computation time. As a rule of thumb, good trade-off between accuracy and computation time is to set Acc to 1.
This component does not impose restrictions on the conductor thickness (thickness may be zero, positive, or negative). Negative thickness means that the conductor is recessed into the substrate.
Substrate parameters Tand1, Tand2 (loss tangents for upper and lower layers) should not exceed 3.0; substrate parameter Sig2 (bulk conductance of the lower layer) shouldn't exceed 3 S/m.
Model implementation is based on EM Quasi-Static technique described in . It accounts for losses in metal and in substrate dielectrics. Polarization loss (Tand1,Tand2) are allowed in both substrate layers. Conductive loss is allowed in lower layer only. Dispersion is partly included.
This element uses line types to determine its layout. By default, the layout uses the first line type defined in your Layout Process File (LPF). You can change the element to use any of the line types configured in your process:
Select the item in the layout.
Right-click and chooseto display the Cell Options dialog box.
Click the Layout tab and select a Line Type.
Clickto use the new line type in the layout.
See “Cell Options Dialog Box: Layout Tab ” for Cell Options dialog box Layout tab details.
See “The Layout Process File (LPF)” for more information on editing Layout Process Files (LPFs) and to learn about adding or editing line types.
This element may be used to model microstrip line over semiconductor substrate insulated with oxide or another semiconductor. For example, MM1LIN may model microstrip line on SiO2/Si substrate or on GaAs/Si substrate. However, model impose limitations on allowed level of polarization and conductive losses, that is, for instance, only high resistance silicon (HRS) substrates may be modeled.
NOTE: The implementation of EM Quasi-Static models relies heavily on the involved numerical algorithms. This may lead to a noticeable increase in simulation time for schematics that employ many such models.
If thickness of any layer is too small in comparison with the thickness of another layer, simulation time may also noticeably grow.