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wilkinsonSplitterUnequal

Create unequal Wilkinson splitter

Description

Use the wilkinsonSplitterUnequal object to create an unequal Wilkinson power splitter. You can use the unequal Wilkinson splitter to divide power unequally between two output ports. Unequal splitters are also used to feed power to antenna arrays for beam shaping.

To analyze the behavioral model for the unequal Wilkinson power splitter, set the Behavioral property in the sparameters to true or 1.

Creation

Description

example

splitter = wilkinsonSplitterUnequal creates an unequal Wilkinson splitter with a Teflon substrate. The default properties are for a resonating frequency of 1 GHz.

example

splitter = wilkinsonSplitterUnequal(Name=Value) sets Properties using one or more name-value arguments. For example, wilkinsonSplitterUnequal(PortLineLength=0.0300) creates a Wilkinson splitter with an input and output line length of 0.0300 meters. Properties not specified retain their default values.

Properties

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Length of the input and the output line in meters, specified as a positive scalar.

Example: splitter = wilkinsonSplitterUnequal(PortLineLength=0.0070)

Data Types: double

Width of the input and the output line in meters, specified as a positive scalar.

Example: splitter = wilkinsonSplitterUnequal(PortLineWidth=0.0070)

Data Types: double

Length of the 70-ohm line in meters, specified as a positive scalar. The typical length of a Wilkinson splitter is λ/4.

Example: splitter = wilkinsonSplitterUnequal(SplitLineLength=0.0570)

Data Types: double

Width of the 70-ohm line in meters, specified as a two-element vector of positive elements.

Example: splitter = wilkinsonSplitterUnequal(SplitLineWidth=[0.00780 0.00890])

Data Types: double

Length of the output matching line in meters, specified as a positive scalar.

Example: splitter = wilkinsonSplitterUnequal(MatchLineLength=0.0780)

Data Types: double

Width of the output matching line in meters, specified as a two-element vector of positive elements.

Example: splitter = wilkinsonSplitterUnequal(MatchLineWidth=[0.0049 0.0076])

Data Types: double

Length of the resistor in meters, specified as a positive scalar.

Example: splitter = wilkinsonSplitterUnequal(ResistorSLength=0.0050)

Data Types: double

Resistance value in ohms, specified as a positive scalar.

Example: splitter = wilkinsonSplitterUnequal(Resistance=50)

Data Types: double

Height of the Wilkinson splitter from the ground plane in meters, specified as a positive scalar.

Example: splitter = wilkinsonSplitterUnequal(Height=0.0076)

Data Types: double

Width of the ground plane in meters, specified as a positive scalar.

Example: splitter = wilkinsonSplitterUnequal(GroundPlaneWidth=0.046)

Example: double

Type of dielectric material used as a substrate, specified as a dielectric object. The thickness of the default dielectric material Teflon is 0.0016 m or the same value as the Height property.

Example: d = dielectric("FR4"); splitter = wilkinsonSplitterUnequal(Substrate=d)

Data Types: string | char

Type of metal used in the conducting layers, specified as a metal object.

Example: m = metal("PEC"); splitter = wilkinsonSplitterUnequal(Conductor=m)

Data Types: string | char

Object Functions

chargeCalculate and plot charge distribution
currentCalculate and plot current distribution
designDesign unequal Wilkinson splitter around specified frequency
feedCurrentCalculate current at feed port
layoutPlot all metal layers and board shape
meshChange and view mesh properties of metal or dielectric in PCB component
shapesExtract all metal layer shapes of PCB component
showDisplay PCB component structure or PCB shape
sparametersCalculate S-parameters for RF PCB objects

Examples

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Create and view a default unequal Wilkinson splitter.

splitter = wilkinsonSplitterUnequal
splitter = 
  wilkinsonSplitterUnequal with properties:

      PortLineLength: 0.0070
       PortLineWidth: 0.0051
     SplitLineLength: 0.0279
      SplitLineWidth: [0.0014 0.0049]
     MatchLineLength: 0.0277
      MatchLineWidth: [0.0039 0.0066]
      ResistorLength: 0.0020
          Resistance: 106
              Height: 0.0016
    GroundPlaneWidth: 0.0300
           Substrate: [1x1 dielectric]
           Conductor: [1x1 metal]

show(splitter)

Figure contains an axes object. The axes object with title wilkinsonSplitterUnequal element contains 8 objects of type patch, surface. These objects represent PEC, feed, Teflon, load.

Calculate and plot the S-parameters of the splitter at 3 GHz.

spar=sparameters(splitter,3e9);
figure
rfplot(spar);

Figure contains an axes object. The axes object contains 9 objects of type line. These objects represent dB(S_{11}), dB(S_{21}), dB(S_{31}), dB(S_{12}), dB(S_{22}), dB(S_{32}), dB(S_{13}), dB(S_{23}), dB(S_{33}).

Create and view a multilayer unequal Wilkinson splitter.

sub =  dielectric(Name=["Teflon","Teflon"],EpsilonR=[2.1 2.1], ...
    LossTangent=[0 0],Thickness=[0.8e-3 0.8e-3]);
unsplitter = wilkinsonSplitterUnequal(Height=0.8e-3,Substrate=sub);
show(unsplitter)

Figure contains an axes object. The axes object with title wilkinsonSplitterUnequal element contains 9 objects of type patch, surface. These objects represent PEC, feed, Teflon, load.

Plot the charge and current on this splitter at 3 GHz.

figure
charge(unsplitter,3e9)

Figure contains an axes object. The axes object with title Charge distribution contains 4 objects of type patch.

figure
current(unsplitter,3e9)

Figure contains an axes object. The axes object with title Current distribution contains 4 objects of type patch.

References

[1] Pozar, David M. Microwave Engineering. 4th ed. Hoboken, NJ: Wiley, 2012.

Version History

Introduced in R2021b

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