Huawei Confidential. All Rights Reserved

ORF010100 Antenna and Feeder System Introduction

ISSUE 1.0

2 Internal Use

objectivesobjectives

At the end of this presentation, you will be familiar with: Antenna Functions Antenna Technologies Antenna Diversity Antenna Polarization Antenna Installation

3 Internal Use

Chapter 1 IntroductionChapter 1 Introduction

Chapter 2 Technologies Chapter 2 Technologies

Chapter 3 Installation Chapter 3 Installation

4 Internal Use

What is Antenna?What is Antenna?

Antenna is used for radiating and receiving radio wave , converting

electronical signals to electromagnetic wave when transmitting, and

converting electromagnetic wave to electronical signal when receiving.

B lah

blahb la h bl ah

5 Internal Use

ClassificationClassification

By working band: UHF, VHF, microwave, etc.

By radiate pattern: omni and directional

By polarization: vertical and horizontal

6 Internal Use

Omni AntennaOmni AntennaDirectional AntennaDirectional Antenna

Antenna Appearance Antenna Appearance

GPS AntennaGPS Antenna

AT1675-0 GPS/GLONASS antennaAT1675-0 GPS/GLONASS antenna ONCORE TIMING2000 GPS antenna ONCORE TIMING2000 GPS antenna

7 Internal Use

Chapter 1 IntroductionChapter 1 Introduction

Chapter 2 TechnologiesChapter 2 Technologies

Chapter 3 Installation Chapter 3 Installation

8 Internal Use

Antenna Function Antenna Function

Convert electronical signals to electromagnetic wave

when transmitting

Convert electromagnetic wave to electronical signals

when receiving

Antenna can not amplify the transmission power,Antenna can not amplify the transmission power,

just concentrate RF power to one directionjust concentrate RF power to one directionNote

9 Internal Use

Dipole & IsotropicDipole & Isotropic

DipolDipolee

IsotropiIsotropicc

An isotropic antenna is an ideal which has identical radiation in all directions and invariant with respect to direction!

An antenna, usually fed from the center, consisting of two equal rods extending outward in a straight line.

10 Internal Use

IsotropicIsotropic

Dipole Dipole

Antenna GainAntenna Gain

The radiation ability of certain antenna overtop dipole or is

otropic

Indicates the antenna feature of electromagnetic radiation

in specific directions

Unit: dBi/dBd

l/2 antenna

Direction antenna

dBi

dBi =dBd+2.15dB

dBd2.15dB

11 Internal Use

Antenna PatternAntenna Pattern

Omni Omni antenna lobe antenna lobe

DirectionDirectionantenna lobe antenna lobe

The antenna pattern describes the radiating abilities of The antenna pattern describes the radiating abilities of antennas in all directions.antennas in all directions.

12 Internal Use

Beam AngleBeam Angle

HPBW: Half Power Beam Bandwidth

Lobe angel between two points, the power of

which reduce to the half of that of the maximum

radiate direction

Vertical HPBW and Horizontal HPBW

60° (eg) Peak

Peak - 3dB

Peak - 3dB

15° (eg) Peak

Peak - 3dB

Peak - 3dB

13 Internal Use

360¡ ã

Omni Antenna

120¡ ã 90¡ ã 65¡ ã

Directional antenna

Antenna PatternAntenna Pattern

The antenna pattern describes the radiating abilities of antennas in all directions.

The BTS antenna is categorized into Omni antenna Directional antenna

The directional antenna is further classified into 120°, 90°, 65°.

14 Internal Use

Front to Back RatioFront to Back Ratio

The ratio of main lobe signal strength to back lobe

This value is within 18—45dB. In urban, it is suggested to use the

antenna with high F/B ratio.

15 Internal Use

Down TileDown Tile -1 -1

To control coverage

Realization: electron and mechanism

16 Internal Use

MechaniMechanismsm

ElectrElectronon

Down Tile-2Down Tile-2

17 Internal Use

Down Tile-3Down Tile-3

18 Internal Use

Polarization diversity

Space diversityd>10 x wavelength

Types of diversity:

DiversityDiversity

19 Internal Use

PolarizationPolarization

The types of polarization: Vertical polarization Horizontal polarization +45°& -45 ° polarization ……

The types of antenna divided by polarization: Single polarization antenna Bi-polarization antenna

Polarization is used to describe Polarization is used to describe the change path of the direction the change path of the direction of the electric field.of the electric field.

20 Internal Use

Single Polarization Antenna Single Polarization Antenna

VERTICAL HORIAONTAL

+ 45 - 45

21 Internal Use

Bi-polarization Antenna Bi-polarization Antenna

V/H +/- 45°

Vertical & horizontal +45°& -45 °

Two ports for two feedersNote

22 Internal Use

Chapter 1 IntroductionChapter 1 Introduction

Chapter 2 Technologies Chapter 2 Technologies

Chapter 3 InstallationChapter 3 Installation

23 Internal Use

IntroductionIntroduction

In CDMA system , BTS antenna & feeder subsystem

consist of two parts: RF antenna & feeder, and dual-

satellite synchronization antenna & feeder.

RF antenna & feeder transmit the modulated RF

signals and receives MS signals, while the dual-

satellite synchronization antenna & feeder provide

precise synchronization for CDMA system.

24 Internal Use

Sect

or B

Sect

or A

Sect

or C

Antenna

Feeder

Jumper

Jumper

BTS cabinet

RF Antenna &FeederRF Antenna &Feeder

Inner

cable

TX/RXMA

NT

RXD

DDU/CDU/DFU

25 Internal Use

Dual-satellite Synchronization Antenna & FeederDual-satellite Synchronization Antenna & Feeder

Inner cable

Receiver on BCKM

GPS/GLONASS receiving antenna

Feeder

BTS cabinet

Lighting arrester

BTS receiver is provided by CLK module on BCKM.BTS receiver is provided by CLK module on BCKM.Note

26 Internal Use

Installation Installation

Feeder Feeder （（ 7/87/8““ ））

FeederFeeder fixing fixing clip clip

Cabling ladderCabling ladder

Grounding clipGrounding clip

Antenna stand Antenna stand

AntennaAntenna

Outdoor Outdoor feederfeeder

JumperJumper

Feeder windowFeeder window

BTS BTS cabinetcabinet

The CDDU has a built-in lightning protection

device to effectively prevent the lightning

strikes. If double protection is required, you

can install a lightning arrester on the feeder.

Note

27 Internal Use

Antenna IndicesAntenna Indices

Some important parameters E.G frequency band 1710-2170 MHZ

Type Parameter Value

Frequency range 1710-1810 MHZ 1850-1990 MHZ

Polarization +45°, -45° +45°, -45°

Gain 2x17.5 dbi 2x18 dbi

Electrical tile 2°, fixed 2°, fixed

VSWR <1.4

Isolation

between ports

>30 db

28 Internal Use

FeederFeeder

Feeder selection Type : 1/2”, 7/8”, 5/4” For 450/800MHz , select 5/4” in the case of feeder le

ngth is more than 80m , otherwise select 7/8” For 1900MHz , select 5/4” in the case of feeder lengt

h is more than 50m , otherwise select 7/8”

29 Internal Use

Points To RememberPoints To Remember

Antenna height : if the antennas are too high, problems such as serious

unexpected coverage and pilot pollution may occur, which will affect the network quality.

Down tile: The antenna tilt angle should be determined according to

the concrete situations, so that the interference between intra-frequency cells can be reduced while the coverage requirements can be met.

Azimuth: The main beam of the antenna should be directed to the

area of high traffic density, to increase the signal strength in that area and improve the conversation quality.

Side & antenna selection

30 Internal Use

Summary

SummarySummary

In this course, we have learned:

Some conceptions of antenna

Antenna technologies

Requirements for antenna installation

Huawei Confidential. All Rights Reserved