Laboratory work # 3 Theme: Design and analyze dipole antennas using the Antenna Designer app Purpose



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Lab 3

Object Functions




Object function

show

Display antenna or array structure; display shape as filled patch

info

Display information about antenna or array

axialRatio

Axial ratio of antenna

beamwidth

Beamwidth of antenna

charge

Charge distribution on metal or dielectric antenna or array surface

current

Current distribution on metal or dielectric antenna or array surface

design

Design prototype antenna or arrays for resonance at specified frequency

EHfields

Electric and magnetic fields of antennas; Embedded electric and magnetic fields of antenna element in arrays

impedance

Input impedance of antenna; scan impedance of array

mesh

Mesh properties of metal or dielectric antenna or array structure

meshconfig

Change mesh mode of antenna structure

optimize

Optimize antenna or array using SADEA optimizer

pattern

Radiation pattern and phase of antenna or array; Embedded pattern of antenna element in array

patternAzimuth

Azimuth pattern of antenna or array

patternElevation

Elevation pattern of antenna or array

returnLoss

Return loss of antenna; scan return loss of array

sparameters

S-parameter object

vswr

Voltage standing wave ratio of antenna

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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