MRSTUB2W models a microstrip radial stub that terminates a microstrip line. The stub is connected to a single node at the reference plane.
|W||Width of connecting microstrip line||Length||L|
|Ro||Outer radius of the stub||Length||L|
|Theta||Angle of the stub||Angle||90 Deg|
W. The conductor width of the connecting microstrip line. If needed, the inner radius Ri can be easily obtained from the specified microstrip width W and the stub angle Theta:
Theta must be within the range 9 ≤ Theta ≤ 160 .
This model is feasible if (Ro-Ri)/Ro > 0.01 .
Model implementation is based on cascading multiple segments of lossy microstrip transmission lines described in . It accounts for losses in metal and in substrate dielectrics. Radiation loss is not 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.
MRSTUB2W replaces the MRSTUB element, which is obsolete. MRSTUB2W is also recommended for use instead of MRSTUB2 because MRSTUB2W is easily accessible for measuring the W parameter, while MRSTUB2 relies on the less convenient internal radius Ri.
Discontinuity models function most accurately when attached to lines that match their corresponding edges. Directly connecting discontinuity models to one another reduces their accuracy.