Object Functions
Object function
show
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Display antenna or array structure; display shape as filled patch
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info
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Display information about antenna or array
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axialRatio
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Axial ratio of antenna
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beamwidth
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Beamwidth of antenna
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charge
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Charge distribution on metal or dielectric antenna or array surface
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current
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Current distribution on metal or dielectric antenna or array surface
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design
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Design prototype antenna or arrays for resonance at specified frequency
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EHfields
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Electric and magnetic fields of antennas; Embedded electric and magnetic fields of antenna element in arrays
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impedance
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Input impedance of antenna; scan impedance of array
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mesh
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Mesh properties of metal or dielectric antenna or array structure
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meshconfig
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Change mesh mode of antenna structure
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optimize
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Optimize antenna or array using SADEA optimizer
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pattern
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Radiation pattern and phase of antenna or array; Embedded pattern of antenna element in array
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patternAzimuth
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Azimuth pattern of antenna or array
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patternElevation
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Elevation pattern of antenna or array
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returnLoss
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Return loss of antenna; scan return loss of array
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sparameters
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S-parameter object
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vswr
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Voltage standing wave ratio of antenna
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Create and view a dipole with 2 m length and 0.5 m width.
d = dipole('Width',0.05)
d =
dipole with properties:
Length: 2
Width: 0.0500
FeedOffset: 0
Tilt: 0
TiltAxis: [1 0 0]
Load: [1x1 lumpedElement]
show(d)
Impedance of Dipole Antenna
View MATLAB Command
Calculate the impedance of a dipole over a frequency range of 50 MHz - 100 MHz.
d = dipole('Width',0.05);
impedance(d,linspace(50e6,100e6,51))
Infinite Reflector Backed Dielectric Substrate Antenna
View MATLAB Command
Design a dipole antenna backed by a dielectric substrate and an infinite reflector.
Create a dipole antenna of length, 0.15 m, and width, 0.015 m.
d = dipole('Length',0.15,'Width',0.015, 'Tilt',90,'TiltAxis',[0 1 0]);
Create a reflector using the dipole antenna as an exciter and the dielectric, teflon as the substrate.
t = dielectric('Teflon')
t =
dielectric with properties:
Name: 'Teflon'
EpsilonR: 2.1000
LossTangent: 2.0000e-04
Thickness: 0.0060
For more materials see catalog
rf = reflector('Exciter',d,'Spacing',7.5e-3,'Substrate',t);
Set the groundplane length of the reflector to inf. View the structure.
rf.GroundPlaneLength = inf;
show(rf)
Calculate the radiation pattern of the antenna at 70 MHz.
pattern(rf,70e6)
References
[1] Balanis, C.A. Antenna Theory: Analysis and Design. 3rd Ed. New York: Wiley, 2005.
[2] Volakis, John. Antenna Engineering Handbook, 4th Ed. New York: Mcgraw-Hill, 2007.
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