MCROSSX$ is a Microstrip iCell and has no parameters. See “Intelligent Cells (iCells)” for more information.
|W1||Conductor Width @ Node1&3||Length||W|
|W2||Conductor Width @ Node 2||Length||W|
|*W3||Conductor Width @ Node 3 (layout only)||Length|
|W4||Conductor Width @ Node 4||Length||W1|
|*AutoFill||AutoFill database if not equal to 0||Integer||0|
* indicates a secondary parameter
The intelligent version of this model automatically assumes these widths are equal to the attached models at that node.
This model implements an X-model of the microstrip Cross-junction. For a more detailed discussion of the X-models see “ EM-based Models (X-models) ”. This model does not include the effects of dielectric, conductor or radiation losses, nor does it account for the effect of conductor thickness. Further, this model assumes that the widths at Port 1 and 3 are equal to W1.
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.
|Independent Parameters:||W1, W2, W4 and Frequency|
|Scalable Parameters:||MSUB H- Substrate Height|
|Fixed Parameters:||MSUB Er Nominal|
|0.25 ≤ Wwidest/H ≤ 4 Required||εr nominal ≤ 16.0 Recommended|
|0.25 ≤ Wothers/Wwidest ≤ 1||1 ≤ εr nominal Required|
|0 ≤ Frequency ≤ Fmax Recommended||(100*|εr-εr nominal|)/εr nominal ≤ 10% Recommended|
|(100*|εr-εr nominal|)/εr nominal ≤ 20% Required|
Wwidest = The largest dimension of W1, W2, and W4
Wothers = W1,W2, and W4 excluding Wwidest
FWmax=The frequency limits of this model are dynamic with respect to the dimensions of the discontinuity. This dynamic frequency limit is displayed to the user via warning messages for the relative size, and dielectric in use. Importantly, this recommended frequency limit will change as a function of the largest width in the discontinuity for a given substrate definition. The frequency limit warns the user that at least one of the transmission lines constructing the discontinuity is approaching the frequency where multiple modes can propagate. See “Upper Frequency Limitations” for more information.
Discontinuity models function most accurately when attached to lines that match their corresponding edges. Directly connecting discontinuity models to one another reduces their accuracy.