WILKE2 models equal Wilkinson power split divider/combiner based on microstrip line models (closed form). Model implies that load resistor is frequency-dependent thin film resistor.
Name | Description | Unit Type | Default |
---|---|---|---|
ID | Name | Text | TL1 |
W | Feeding line width at ports 1,2, and 3 | Length | W^{[1]} |
W1 | Width of branched lines | Length | W^{[1]} |
L1 | Length of branched lines | Length | L^{[1]} |
WR | Thin film resistor width | Length | W^{[1]} |
LR | Thin film resistor length | Length | L^{[1]} |
RS | Sheet (surface) resistivity of thin film resistor | ohm/square | 100 |
FR | Frequency for scaling sheet resistivity | Frequency | 0 |
MSUB | Substrate definition | Text | MSUB1^{[2]} |
^{[1] }User-modifiable default. Modify by editing under $DEFAULT_VALUES in the
^{[2] }Modify only if schematic contains multiple substrates. See “Using Elements With Model Blocks” for details. |
Choice of parameter W1 should provide characteristic impedance of branched lines that is √2 times greater than the characteristic impedance of the feeding lines
Length of branched lines L1 should be about quarter wavelength of microstrip line having width W1.
Impedance of load resistor R should be twice the characteristic impedance of feeding lines at ports 1,2, and 3
See recommendations how to choose frequency for scaling sheet resistivity in TFR model description. For most cases setting F=0 is the best choice.
WILKE2 uses closed form models MLIN (microstrip line) and MTEE (T-junction of microstrip lines), so all limitations of these models are applicable to WILKE2.
Load resistor is modeled with TFR model. This model represents thin film resistor as a lossy microstrip line with the complex characteristic impedance.
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.
To provide equal power split, matching and maximum isolation between branched lines parameters must comply with the above recommendations. However, user may set parameters to values of his choice or use them for circuit optimization.