Simulating a balanced and unbalanced transmission lines in a structure

Hello everyone,

I’m trying to simulate a structure that has a balanced input on one side and an unbalanced output on the other side. I used the following line to define the feed location, but it shows an error, which is also shown below.

Does anyone know how I can fix this?

thanks,

Morteza

feedloc = [[0.1 0 1 3];[0 0 1 1]];

Error using generateRectanglePoints

Expected input number 2, length, to be positive.

Error in antenna.generateRectanglePoints (line 22)

validateattributes(length,{'numeric'},{'nonempty','scalar', ...

Error in antenna.Rectangle (line 98)

p = antenna.generateRectanglePoints( parserObj.Results.Center, ...

Error in em.Antenna/getStripMesh

Error in em.MeshGeometry/meshProbe

Error in em.PCBStructures/buildViaMesh

Error in em.PCBStructures/generateMeshForStripFeedAndVia

Error in pcbStack/meshGenerator (line 1340)

Mesh = generateMeshForStripFeedAndVia(obj,mesherInput);

Error in em.MeshGeometry/updateMeshForPcbStack

Error in em.MeshGeometry/getMesh

Error in em.EmStructures/analyze

Error in em.SharedPortAnalysis/protectedsparameters (line 55)

status = analyze(obj,freq, 1:TotalArrayElements);

Error in em.PortAnalysis/sparameters (line 43)

S = protectedsparameters(obj,freq,z0);

sparam = sparameters(pcbobj, 10e9:0.2e9:15e9, 50)