Introduction to Linear Antennas Zbynek Raida Dept. of Radio Electronics Brno University of...
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Introduction to Introduction to Linear Antennas Linear Antennas Zbynek Raida Zbynek Raida Dept. of Radio Electronics Dept. of Radio Electronics Brno University of Technology Brno University of Technology Brno, Czechia Brno, Czechia
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Transcript of Introduction to Linear Antennas Zbynek Raida Dept. of Radio Electronics Brno University of...
Introduction toIntroduction toLinear AntennasLinear Antennas
Zbynek RaidaZbynek Raida
Dept. of Radio ElectronicsDept. of Radio ElectronicsBrno University of TechnologyBrno University of TechnologyBrno, CzechiaBrno, Czechia
HistoryHistory
1864: The agreement of the results seems to show that light and magnetism are affections of the same substance, and that light is an electromagnetic disturbance propagated through the field according to electromagnetic laws.
James Clerk Maxwell
Maxwell Equations (1)Maxwell Equations (1)
Sl
ddt
dd SHlE
Sl
ddt
dId SElH
QdS
SE
0S dSH
EJH dt
d
HE dt
d
E
0 H
Maxwell Equations (2)Maxwell Equations (2)
André-Marie Ampére Sl
ddt
dId SElH
Maxwell Equations Maxwell Equations ((33))
André-Marie Ampére Sl
ddt
dId SElH
Maxwell Equations Maxwell Equations ((44))
Michael Faraday Sl
ddt
dd SHlE
d /dt
E
dl
Maxwell Equations Maxwell Equations ((55))
Michael Faraday
Sld
dt
dd SHlE
Wireless CommunicationWireless Communication
1887:
Heinrich Rudolf Hertz
Symmetrical DipoleSymmetrical Dipole ( (11))
l
z
dz
I(z)
P
Pr(z)
r=konst
l
z
P
P
r (z)
r r
1
z
r
r (z)2
l
l
I
IObr. 3.14a) Přímý vodič v ose z b) Symetrický dipól c) Monopól
a) Direct conductorb) Symmetric dipolec) Monopole
Symmetrical Dipole Symmetrical Dipole ((22))
0 5 10 15 20 25 30 3512345678 30
210
60
240
90
270
120
300
150
330
180 0
segment
I[mA]
0 5 10 15 20 25 30 350.40.60.81.01.21.41.61.8
30
210
60
240
90
270
120
300
150
330
180 0
I[mA]
segment
a) b)
c) d)
Monopole (1)Monopole (1)
Monopole (2)Monopole (2)
Slot (1)Slot (1)
Slot (2)Slot (2)
Monopoles (1)Monopoles (1)
Monopoles (2)Monopoles (2)
Impedance antény
-150
-100
-50
0
50
100
150
0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00 4.50
frekvence [GHz]
rezi
ste
nce
/re
akt
an
ce [
oh
m]
real
imag
frequency [GHz]
input impedance [Ohm]
Impedance antény
-60
-40
-20
0
20
40
60
80
100
120
0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00 4.50
frekvence [GHz]
rezi
sten
ce/r
eakt
ance
[o
hm
]
real
imag
Monopoles (3)Monopoles (3)
frequency [GHz]
input impedance [Ohm]
Fractal monopoles (1)Fractal monopoles (1)
Fractal monopoles (2)Fractal monopoles (2)
0
50
100
150
200
250
300
350
400
450
500
550
0,5 1,0 1,5 2,0 2,5 3,0 3,5
f [GHz]
Re{Z
vst}
[Ohm
]
dipol K0
dipol K1
dipol K2
Fractal monopoles (3)Fractal monopoles (3)
-300
-250
-200
-150
-100
-50
0
50
100
150
200
0,5 1,0 1,5 2,0 2,5 3,0 3,5
f [GHz]
Im{Z
vst}
[Ohm
]
dipol K0
dipol K1
dipol K2
Wideband Dipole (1)Wideband Dipole (1)
Wideband Dipole (2)Wideband Dipole (2)
CSTmeas.IE3D
Wideband Dipole (3)Wideband Dipole (3)
MATLABMeasurementCST
After optimization …
Dipole and ReflectorDipole and Reflector (1) (1)
Dipole and ReflectorDipole and Reflector ( (22))
Dielectric Dipole (1)Dielectric Dipole (1)
Dielectric Dipole (2)Dielectric Dipole (2)
Wideband MonopoleWideband Monopole (1) (1)
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