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Wilkinson Equal Power Split Divider Thin Film Resistor Aggregate: WILKE2

Symbol

Summary

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.

Parameters

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 default.lpf file in the root installation directory. See the AWR Microwave Office Layout Guide for details.

[2] Modify only if schematic contains multiple substrates. See “Using Elements With Model Blocks” for details.

Parameter Restrictions and Recommendations

  1. Choice of parameter W1 should provide characteristic impedance of branched lines that is √2 times greater than the characteristic impedance of the feeding lines

  2. Length of branched lines L1 should be about quarter wavelength of microstrip line having width W1.

  3. Impedance of load resistor R should be twice the characteristic impedance of feeding lines at ports 1,2, and 3

  4. See recommendations how to choose frequency for scaling sheet resistivity in TFR model description. For most cases setting F=0 is the best choice.

Implementation Details

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.

Layout

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.

Recommendations for Use

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.

References

[1] Bahl,I.J., and Bhartia P., Microwave solid state circuit design, John Wiley & Sons, N.Y, 1988, pp. 214-222

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