OMF000004 RF Parts and Antenna ISSUE1.1

8/13/2019 OMF000004 RF Parts and Antenna ISSUE1.1

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OMF 000004Radio Frequency Part and

Antenna ISSUE1.4

Wireless Training Department


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RF Part in BTS

Antenna


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Combiner and splitter UnitCombiner and splitter Unit

Introduction

CDU

SCU

EDU


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1.1 Introduction1.1 Introduction

RF device in BTS includes two parts:

Indoor: combiner and splitter unitFor example: CDU module SCU module and

!DU module

"utdoor: antenna #eeder T$A %Tower $ountAmpli#ier& 'umper and li()tnin( arrester


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Function of Combiner and Splitter Usin( one antenna support multi T*+R*

si(nals decreases t)e amount o#antenna and #eeder

Complete T*+R* duplex and combine

T* si(nal

Filter ampli#ier and split t)e R* si(nal

Provide power #or TTA


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Tx,Tx-

Tx.Comb

Tx.Dup

combiner duplex

splitter

splitter

ampli#ier

#ilter

Rx,Rx-Rx/Rx0

Rx1

Rx2Rx3Rx4

56.out

56.in

RxD.outRxD

Tx+Rx.A7T

1.2 CDUCombining Distribution Unit1.2 CDUCombining Distribution Unit


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T*,

T*-

T*/

T*0

T*8Comb

1.3 SCU Simple Combining Unit1.3 SCU Simple Combining Unit

combiner

combiner

combiner


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Tx, duplex

splitterampli#ier

x,

Rx-

Tx+Rx.A7T,

splitter

ampli#ier

Rx,

Rx-

duplex Tx+Rx.A7T-x-

1.4 EDUEnhance Duplexer Unit1.4 EDUEnhance Duplexer Unit


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combine

mode

typical lossvalue of

TX(dB)

pricecomparison

(per TRX)

CDU

combine twoT* si(nal

one step /dBcombiner

091 middle

SCU

combine #our

T* si(naltwo step /dB

combiner

294 low

SCU:CDU

combine #ourT* si(nal

two step /dB

combiner

4 low

!DUno combiner

double duplex, middle

Double CDU% wit)combine&

no combinerdouble duplex

, )i()

Double CDU%wit)out combiner&

combine two

T* si(naldouble duplex

091 middle

Comparison among different ! unitComparison among different ! unit


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RF Part in BTS

Antenna


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"utdoor ! de#ice"utdoor ! de#ice

Introduction

$ntenna

%o&er %op $mplifier

feeder


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Dual polarization

antenna

TTA

Lightning arrester

BTS rac;

umper connectorD!"

D!" connector

Lightning arrester#feeder

connectorD!"

umper#TT$

%onnector (D!")

&umper

umper#TT$ connector

D!"

$ntenna

connectorD!"


! de#ice of '%S


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2.2 $ntenna2.2 $ntenna

function

Radiate and receive radio wave convert

)i() #re


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Omni antenna

l obe

Di recti on

antenna l obe


pattern

2(ain specification


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adiate pattern


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t)eor= source

l / 2 antenna

Direction antenna

dBd

dBi

dBi'dBd()*+,


?ain

"ne important c)aracteristic o# antenna it e


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5PB@: 5al# power bandwidt)

6obe an(els between two point t)e power o# w)ic)reduce to t)e )al# o# t)at o# t)e maximum radiate

direction9

>ertical 5PB@+5oriontal 5PB@

7ormall= we re#ers to )oriontal an(el #or example :21 de(ree de(ree ,- de(ree

F+B: #orward to bac; ratio

T)e ratio o# $ain lobe si(nal stren(t) to bac; lobe

T)is value is wit)in ,401dB9 In urban it issu((ested to use t)e antenna wit) )i() F+B ratio


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2.2 antenna2.2 antenna

polariation

T)e direction o# electro8vector radiated b= antenna9 Dual

polariation antenna usuall= adopts :01+801 de(ree

ort)o(onal polariation9 >ertical antenna adopt vertical

polariation9 T)e vertical polariation wave is vertical wit) t)e plane o#

(round and t)e )oriontal polariation wave is parallel wit)

t)e plane o# (round

"ne antenna )as onl= one polariation direction9 Dual

polaried antenna contains two sin(le8polaried antenna in

one entit=


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)olari*ation

-.RT!%$L /0R!$0"T$L

( 1, 2 1,


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Dual )olari*ation

-#/ (#2 1,3


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Port isolation

T)e isolation amon( ports s)ould be more t)an /dB #or

multi port antenna suc) as dual polariation antenna dual

band dual polariation antenna9

Power capacit=

Antenna can bear t)e max9 power t)at antenna can wor;

lon( time9 Because antenna contains matc)in( balance

p)ase s)i#t and couplin( devices t)e bearin( power o#

t)ese device is limited

7ull #illed

It ma= be need null #illed tec)nolo(= applied w)en ero

dept) is less t)an main beam #or E-2dB9

5i() (ain antenna especiall= adopt null #illed antenna to

e##ectivel= improve t)e nearb= conver(e


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Upper side lobe suppression T)is index s)ould be less t)an 8,4dB

PI$ %passive inter modulation &

PI$ s)ould be satis#= 8,1dBc

Antenna sie and wei()t

t)e antenna sie s)ould be as small as

possible and its wei()t s)ould be as li()t

as possible in case t)at t)e electrical

indices can meet t)e re


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@ind bearin( capabilit=

t)e antenna is re


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BTSBTS

3

distributing antenna s+stem

Power

splitterPower

splitter

Power

splitter

coupling

coupling

coupling

coupling

Small

antenna

Small

antenna

Small

antenna

Small

antenna

Small

antenna

Small

antenna

Small

antenna

coupling

Dual direction

amplifier

Dual direction amplifier


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Tx+Rx

/

/

/

/

/

/

/

/

/

/

/

/

Tx+Rx

,9/2

91,

,91



Dual direction

amplifier


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signal


T)e optical #iber repeater is mainl= adopted in t)e case

o# wide covera(e and lon( distance transmission

Optical transceiver

Optical transceiver

Optical transceiver

Optical transceiver

transceiver

transceiver


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Lea4ing fiber

!t is mainly adopted for tunnel5 metro5 and 6ith high

cost of e7uipment and installing

Tx+Rx

Matching load

Matching load



Power splitter


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Comparison with three kinds of distributed antenna Comparison with three kinds of distributed antenna

t=pe lea;in( #iber coaxial #iber optical

desi(n a(ilit= (ood (ood not (ood

cost )i() low )i()complexit=o#

installin()i() low low

loss o#transmission

)i() )i() low

power suppl= not needed not needed needed

reliabilit= )i() )i() low

applicabilit= metrotunnel)i() buildin(commercial

area

#ar area

covera(e


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Simplex %%$ duplex %%$ triplex %%$

2.3 %%$2.3 %%$

6ow noise ampli#ier

T* #ilter

b=passBias TeeBT8

triplex %%$

antenna

D%

R filterR filter


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2.3 %%$2.3 %%$

Turn on power o# TTA in CDU be#ore install

TTA switc) is in rear panel o# CDU

Con#i(uration alarm t)res)old o# TTA current be#ore install

TTA current switc) is in rear panel o# CDUCon#i(uration attenuation #actor o# receive si(nal on consol

attenuation #actor o# receive si(nal

HTTA (ain E#eeder loss

Simplex TTA (ain:,0dB triplex TTA (ain:,-dB

Dont use TTA i# nor necessar=

For t)e convenience o# installation

To (et better li()tenin(8proo# e##ect

,otice-


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2.3 %%$2.3 %%$

Rear panel o# J$@ CDU

TTA$ TTAD

"FF "FF

TTA$ TTAD

,

-

/TTA$ TTAD

"FF "FF

,-/

TTA$: power switc) o# main TTA switc)

TTAD: power switc) o# diversit= TTA

select current limit

TTA$ TTAD


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$AI7

, -

/

,-

/

DI>!RS!

7ote:

$AI7main TTA switc)

DI>!RS!diversit= TTA switc)

2.3 %%$2.3 %%$

Rear panel o# C"$ D!> CDU

, -

/

,-

/

, -

/

,-

/


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!"#$%&'$'&($)*$*)+,C%%D-./)012

(#3#$4'$'&($*(&$1)*$#4S5,5--%%/)012

.COM6#$%%'$'&($(*$4M'*)*./)01 2

.7DR68#$41'$'&*$))*$4'4$')%$31!D,(-/&0* 2

.7DR68#$%&'$'&($*(&$1)*$4*$#4!D,&-./)01 2 %9###'9)##'9###13#

manufacturerBend

Radi us (m):S8RLOSS dB!""m /M+;2#$%&

2.4 !EEDE2.4 !EEDE

Feeder selection

T=pe : ,+-K3+4K1+0K

Select 1+0K in case o# #eeder len(t) is more t)an 4 m

and ot)erwise select 3+4K in $5

Select 1+0K in case o# #eeder len(t) is more t)an 1 m

and ot)erwise select 3+4K in ,4$5

Feeder curvature s)ould not be so bi( outer conductor

s)ould be connected to eart)


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Documents

OMF000004 RF Parts and Antenna ISSUE1.1