I'm using antenna toolbox. Can't add a dielectric layer without adding a ground plane

I am developing a fractal antenna. I just want a fractal pattern on a dielectric, like FR4. Don't want a reflector/groundplane.

What I'm trying to get to as an example: Pic attached

Basic code below: You can see the dielectric is always the size of the ground-plane and always as thick as the calculate distance between the antenna exciter and ground plane.

Thanks,

Kurt Dobson

Northrop Grumman

% Create a fractalGasket antenna backed with reflector
% Generated by MATLAB(R) 9.14 and Antenna Toolbox 5.4.
% Generated on: 10-Apr-2023 20:03:35

Antenna Properties
antennaObject = design(reflector('Exciter', fractalGasket), 900*1e6);
antennaObject.Exciter.NumIterations = 3;
antennaObject.Substrate.Name = 'FR4';
antennaObject.Substrate.EpsilonR = 4.8;
antennaObject.Substrate.LossTangent = 0.026;
% Show
figure;
show(antennaObject)

Answer 1

[Raghunathraju]

Hi,

You can use pcbStack for adding dielectric layer without ground plane. You can refer to the following

ant=pcbStack(fractalGasket)

ant = 
  pcbStack with properties:

              Name: 'pcbfractalGasket'
          Revision: 'v1.0'
        BoardShape: [1×1 antenna.Rectangle]
    BoardThickness: 0.0013
            Layers: {[1×1 antenna.Polygon]}
     FeedLocations: [0 0 1]
      FeedDiameter: 1.0000e-03
      ViaLocations: []
       ViaDiameter: []
      FeedViaModel: 'strip'
       FeedVoltage: 1
         FeedPhase: 0
         Conductor: [1×1 metal]
              Tilt: 0
          TiltAxis: [1 0 0]
              Load: [1×1 lumpedElement]

show(ant)

ant.Layers{2}=dielectric('FR4')

Warning: Dielectric thickness is updated with BoardThickness. Assign BoardThickness before setting up the Layers.

ant = 
  pcbStack with properties:

              Name: 'pcbfractalGasket'
          Revision: 'v1.0'
        BoardShape: [1×1 antenna.Rectangle]
    BoardThickness: 0.0013
            Layers: {[1×1 antenna.Polygon]  [1×1 dielectric]}
     FeedLocations: [0 0 1]
      FeedDiameter: 1.0000e-03
      ViaLocations: []
       ViaDiameter: []
      FeedViaModel: 'strip'
       FeedVoltage: 1
         FeedPhase: 0
         Conductor: [1×1 metal]
              Tilt: 0
          TiltAxis: [1 0 0]
              Load: [1×1 lumpedElement]

show(ant)

For more information refer pcbStack