Create a Patch Antenna on Low-Epsilon Thin Substrate
Create a rectangular patch antenna with a length of 40 mm and a width of
30 mm on a 80 mm x 60 mm ground plane. The lossless substrate has a dielectric
constant of 2.33 and thickness of 1.57mm. The feed is offset by 5.5 mm from
the origin along the x-axis.
p1 = patchMicrostrip;
p1.Length = 40e-3;
p1.Width = 30e-3;
p1.Height = 1.57e-3;
p1.GroundPlaneLength = 80e-3;
p1.GroundPlaneWidth = 60e-3;
p1.FeedOffset = [5.5e-3 0];
Table 4.3. Dielectric Catalog
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The substrate specified for this patch is not part of the dielectric catalog.
You can add it to the catalog if desired, so that the material can be used next time
without specifying its electrical properties. You can also specify the substrate
property directly as well as shown below.
p1.Substrate = dielectric('Name','material1','EpsilonR',2.33);
As indicated in the reference [1], the feed is modeled as a square column
of side 1mm. This feed model is available in the pcbStack. Convert the patch
model to the stack representation and model the feed.
pb1 = pcbStack(p1);
pb1.FeedDiameter = sqrt(2)*1e-3;
pb1.FeedViaModel = 'square'
pb1 =
pcbStack with properties:
Name: 'Probe-fed rectangular microstrip patch'
Revision: 'v1.0'
BoardShape: [1×1 antenna.Rectangle]
BoardThickness: 0.0016
Layers: {[1×1 antenna.Rectangle] [1×1 dielectric] [1×1
antenna.Rectangle]}
FeedLocations: [0.0055 0 1 3]
FeedDiameter: 0.0014
ViaLocations: []
ViaDiameter: []
FeedViaModel: 'square'
FeedVoltage: 1
FeedPhase: 0
Tilt: 0
TiltAxis: [1 0 0]
Load: [1×1 lumpedElement]
figure
show(pb1)
Fig. 4.2. Patch antenna structure.
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