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Filter Coupled Line - Visualize and Analyze

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This example shows you how to create, visualize, and analyze a coupled line filter.

Create a coupled line filter with default properties.

filter = filterCoupledLine
filter = 
  filterCoupledLine with properties:

           FilterOrder: 3
        PortLineLength: 0.0279
         PortLineWidth: 0.0051
     CoupledLineLength: [0.0279 0.0279 0.0279 0.0279]
      CoupledLineWidth: [0.0036 0.0049 0.0049 0.0036]
    CoupledLineSpacing: [1.8270e-04 0.0019 0.0019 1.8270e-04]
                Height: 0.0016
      GroundPlaneWidth: 0.0551
             Substrate: [1×1 dielectric]
             Conductor: [1×1 metal]

View the filter.

show(filter)

Plot the charge distribution at 5 GHz.

charge(filter,5e9)

Plot the current distribution at 5 GHz.

figure
current(filter,5e9)

Calculate and plot the s-parameters.

spar = sparameters(filter,linspace(1.5e9,2.5e9,101));
figure,rfplot(spar)