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

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Dr. W. Kurt Dobson
Dr. W. Kurt Dobson 2023-4-11
回答： Raghunathraju 2023-4-28
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)

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回答（1 个）

Raghunathraju
Raghunathraju 2023-4-28
Ran in:
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

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