modul6-antennarelatedequipments-131010061500-phpapp01.ppt
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Outline
Base station antennaspecification and
meanings
Antenna types and
trends Antenna Type And
Developments
Other Elements
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BTS Logic Structure
BSC
Baseband
subsystem
Power supply
subsystem
!
subsystem
"bisinter#ace
$m
inter#ace
MS"ntenna % #ee
dersubsystem
-48V/+24V
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&
AntennasCategories
Omnidirectional antennas radiation patterns is constant in t'e
'ori(ontal plain
use#ul in #lat rural areas
Directional antennas concentrate main energy into certain
direction
larger communication range use#ul in cities) urban areas) sectorised
sites
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*
RF Antenna and Feeder
SectorA
SectorA
Se
cto
rA
Antenna
Feeder
Jumper
Jumper
BTS cabinet
+nner
cable
,--
M"/,
-0
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Antennas Antenna !ain Measures t'e antenna1s capability to transmitetract energy
to#rom t'e propagation medium air4 dB o5er isotropic antenna dBi4
dB o5er dipole dBd4
"ntenna gain depends on mec'anical si(e "
e##ecti5e antenna aperture area w #re7uency band
"ntenna 8ain
G A w=4
2
Pt
Gain(Dbi)
Isotropic radiated Power
Equivalent isotropicradiated power:EIRP = Pt+Gain(Dbi)
radiatedpower
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Technical Data
B l a h b l a h
b l a h b l a h
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:
Antenna "ropertiesElectrical properties
;peration !re7uency Band +nput impedance
ori(ontal
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GSM-GPRS Operation
Antenna Electrical
properties
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$avelength
%&' $avelength
%&( $avelength
%&( $avelength
%&' $avelength
Dipole
Dipoles
%)**#+, %--mm
.**#+, ///mm
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% dipolerecei5ed power4 %m$#ultiple dipole matri0
ecei5ed power ( m$
GAIN 1 %*log2(m$&%m$3 1 -dBd
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!ain 1 %*log2)m$&%m$3 1 .dBi
4Sector antenna5
Received po6er )m$
4Omnidirectional array5
Received po6er %m$
;5erlook
Antenna
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SM 900 : 890-960MHz
SM 1800 : 1710-1880MHz
SM dual band : 890-960MHz &
1710-1880MHz
eg.824-960MHz 1710-1900MHz
CDMA2000 1x
Fre7uency Range
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&
8mpedance
*A
Ca9le
:* ohms
Antenna
:* ohms
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*
.;: $)*
ohms:* ohms
For6ard< %*$
Bac=6ard< *;:$
Return Loss %*log2%*&*;:3 1 %/dB
>S$R 2>oltage Standing $ave Ratio3
>S$R
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"olari,ation
>ertical +ori,ontal
? (:degree slant (:degree slant
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:
>&+ 2>ertical&+ori,ontal3 Slant 2?& (:@3
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E
?inear)5ertical
&*dual linear &*slant
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2A
Dipole
8deal radiating dot source2lossless radiator3
eg< *dBd 1 ';%:dBi
dBd and dBi
';%:dB
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2
"attern
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Beam6idth
%'*@ 2eg3"ea=
"ea= %*dB
"ea= %*dB
%*dB Beam6idth
-*@ 2eg3 "ea=
"ea= /dB
"ea= /dB
/dB Beam6idth
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3dB Beamwidt' >ori(ontal
0irectional "ntenna 6*FEAFA*F2A F;mni 36AF
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2&
0irectional ;mnidirectional
/dB Beam6idth >ertical
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2*
Mec'anical down tilt
!ied electronic down tilt
"djustable electronic down
tilt
Do6ntilt
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Demonstration of Electronic Do6ntilt
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on do6n tilt Electronic do6ntilt #echanical
do6ntilt
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2:
Electronic and mechanical do6ntilt
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2E
Antenna Do6ntilit $hats goal
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3A
Antenna Do6ntilt Consideration
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3
atio o# maimum
mainlobe to maimumsidelobe
F&B 1 %* log2F"&B"3 typically ':dB
Bac= po6er Front po6er
Front to 9ac= ratio
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pper Side lo9es Suppression ull Fill
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Sidelo9es
2dB3
2dB3
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3*
Continuous 2**AA watts
peak n2p
"ermitted "o6er
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+M0@2&3dBm
#) #2) 2##2) 2#2#
.%/#+,./-#+,.:.#+,.)'#+,
,'ird ;rder +ntermodulation
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8ntermodulation
+ntermodulasi ,erjadi akibat penguatan
sistem yang non linier >anya orde ke3 dan
kadangkadang orde ke*yang signi#ikan
Sinyal dengan amplitudayang sama meng'asilkanle5el +M yang sama pada#rek tinggi dan renda'
Sinyal dengan amplitudaberbeda memberikanle5el +M yang berbeda
pula $ntuk mencega'
intermodulasi)penguatdioperasikan padapenguatan bukanmaksimum
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3:
8ntermodulation
+ntermodulasi
Gomp. ;rde
di'arapkan linier
Gomp. ;rde 2 #rek 2
diredam ole' #ilter
Gomp. ;rde 3 #rek 3
diredam dengan #ilter
"enguat
onlinier
( )
( )tB
tAv
B
Ai
cos
cos
+
=
++
+=
3
2
i
iio
cv
bvavv
Hang bermasala'
Gomponen yang lain
amplituda kecil
( ) ( )ABBA
2,2
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3E
%***m$ 2 %$3 %m$
%*log2%***m$&%m$3 1 /*dB
8solation
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&A
%* Simple !uidelines for RF Safety
"ll personnel s'ould 'a5e IMI awareness training
"ll personnel entering t'e site must be aut'ori(ed
;bey all posted signs
"ssume all antennas are acti5e
Be#ore working on antennas) noti#y owners and disable appropriate
transmitters
Maintain minimum 3 #eet clearance #rom all antennas 0o not step in #ront o# antennas
$se personal ! monitors w'ile working near antennas
/e5er operate transmitters wit'out s'ields during normal operation
0o not operate base station antennas inside e7uipment rooms
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P
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&2
!oodloo=ing
environmentprotecting
Colour
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GSM-GPRS Operation
Antenna Types and Development
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&*
Antenna Types
By frequency band: GSM900, GSM1800, GSM900/1800
By polaria!ion: "er!ical, #orion!al, $4%& linear
polaria!ion, circle polaria!ion
By pa!!ern: '(ni)direc!ional, direc!ional
By do*n)!il!: +on, (ecanical, elec!ronic
ad-us!(en!, re(o!e con!rol
By func!ion: .rans(ission, receiin, !ransceiin
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&6
Broad band
Multi#unctional>ig' +ntegrity
"ntenna 0e5elopment ,rend
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A t
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&9
de# "ttenuation between
,- % - antennaconnectors
>ori(ontal separation
needs appro. *distance #or
su##icient decoupling
antenna patternssuperimposed i# distance too
close
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&:
8nstallation E0amples
ecommended decoupling
,- ,- J2AdB ,- - J&AdB
>ori(ontal decoupling distance depends on antenna gain
'ori(ontal rad. pattern
;mnidirectional antennas - D ,- wit' 5ertical separation KBajonettL4
-) - di5. ) ,- wit' 5ertical separation K#orkL4
$ertical decouplin% is much more e&ective
#'m
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Di it
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&E
*ime diversit
,requenc diversit
-pace diversit
Polarisation diversit
.ultipath diversit
interleavin%
/requenc hoppin
multiple antenna
crosspolar antenn
equaliserra0e receiver
t
f
DiversityDiversity Technics
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Di it
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*A
0i5ersity gain depends on en5ironment
+s t'ere co5erage impro5ement by di5ersity antenna di5ersity
e7ui5alent to *dB more signal strengt'
more pat' loss acceptable in link budget
'ig'er co5erage range
R
R(div) 1 "'2 R3 "'4 3 554#6 more covera%e per celneeds less cells in total 55
*rue onl (in theor) i/ theenvironment is in7nitel lar%e
and 8at
DiversityCoverage 8mprovement
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*
et6or= Elements#+A
Mast>ead "mpli#ier?ow /oise "mpli#ier4 - signal ampli#ied near
t'e antenna in t'e top o#t'e mast
;##ers better co5erage Iliminates t'e antenna
cable loss +ncreased recei5er
sensiti5ity o# t'e B,Sand cell si(e
+ncreased network7uality
9oise ,i%ure !# d; (tpical)R< Gain: p to " d;Dimensions : >> ? "2# ? "2 mm@ei%ht : !> 0% (duple?ed)
$olume : A! lIP > Enclosure ProtectionPower ,eedin% *hrou%h 3ntennaBoa?3larms handled in ;*-
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*2
Booster
,- signal ampli#ied
/okia Booster Con#iguration
Booster P"4 $nit ,B$4
Booster !iltering $nit "!>4
Mast'ead Preampli#ier e7uipment M>"4
;utput power be#ore combining can be up to &E dBm
+solator D combiner D #ilter "!>4 gi5e roug'ly 2.* dB losses
Booster B,S is suitable #or all t'e en5ironments w'ere
en'anced co5erage or 'ig' output power is needed
,'eoretically) cell radius is en'anced up to 6AN and t'e
co5erage area is roug'ly t'e triple
et6or= ElementsBooster *R
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*3
BTS E7uipments layout
,;=I
B,SI
IC,+!+I
B",,IH
,"/SM+SS+;/ IOP.
S+,I
8I/SI,
"
C
!roundingsensor
AC"DB
Power P?/
S>I?,I
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GSM GPRS Operation
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GSM-GPRS Operation
End of Setion !
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