04) GSM-BTS Antenna System_MOO_24Feb06

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Transcript of 04) GSM-BTS Antenna System_MOO_24Feb06

ZTE University

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GSM BTS ANTENNA

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OBJECTIVES To know GSM Antenna specifications and definitions To identify the difference between space and polarization diversity To comprehend the structure antenna system in a BTS SiteZTE University

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the

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RADIO WAVES Is a form of electromagnetic radiation typically generated as disturbances sent out by oscillating charges on a transmitting antenna

B l a h bl ah b la h b l a h

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ANTENNA

An Antenna is any device used to collect or radiate Electromagnetic Waves

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ANTENNA for MOBILE COMMUNICATIONS

Linear antennas are used: Monopole (Slab) Dipole Elements Array of dipoles

Single Monopole Patch Antenna Base Tranceiver Station Antenna Mobile Phones

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ANTENNA ELECTRICAL PROPERTIES Operating Frequency Band Input impedance VSWR Polarization Gain Radiation Pattern Horizontal/Vertical beamwidth Downtilt Front/back ratio Sidelobe suppression and null filling Power capability 3rd order Intermodulation InsulationZTE University www.univ.zte.com.cnThe information contained in the file is solely property of ZTE corporation. Any kind of disclosing without permission is prohibited.

ANTENNA MECHANICAL PROPERTIES Size Weight Radome material Appearance and color Working temperature Storage temperature Windload Connector types Package Size Lightning Protection

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ANTENNA BASIC STRUCTURE

Antenna are generally composed of stacked of dipole bundling their radiated power to form a desired antenna pattern in vertical plains around the antenna

Depending on the gain desired that wants to be achieved several of those dipoles can be arranged on top of one another

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GENERATION OF RADIO WAVES DIPOLESWavelength 1/4 Wavelength 1/2 Wavelength 1/4 Wavelength 1/2 Wavelength Dipole

1800MHz 900MHz

166mm 333mm

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HALF WAVE DIPOLE

1

dipole

Multiple dipole matrixReceived Power 4 mW

Received Power 1mW

GAIN= 10log(4mW/1mW) = 6dBd

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ISOTROPIC ANTENNA

Antenna (Overlook

Omnidirectional array Received power 1mW

Sector antenna Received power 8mW

Gain=10log(8mW/1mW) = 9dBi

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dBd and dBi GAIN COMPARISON

Ideal radiating dot source (lossless radiator)

2.15dB

0dBd = 2.15dBi

Dipole

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dBd and dBi GAIN COMPARISON

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ANTENNA ARRAYS

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GSM ANTENNA FREQUENCY RANGE

T GSM 900 GSM 1800 GSM Dual Band

F 890 1710 890 1710 -

Range 960 MHz 1880 MHz 960 MHz 1880 MHz

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GSM ANTENNA FREQUENCY RANGE

Optimum 1/2 wavelength for dipole at 925MHz

at 890 MHz

at 960 MHz Antenna Dipole

BANDWIDTH = 960 - 890 = 70MHz

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IMPEDANCE

Standard Value: 50;

Antenna Cable 50 ohms 50 ohms

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VOLTAGE STANDING WAVE RATIO (VSWR)

Forward: 10W 50 ohms Backward: 0.5W 80 ohms

9.5 W

Return Loss

10log(10/0.5) = 13dB

VSWR (Voltage Standing Wave Ratio)

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VOLTAGE STANDING WAVE RATIO (VSWR)

1.5 + = (VSWR-1)/(VSWR+1) RL = -20lg +

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BEAMWIDTH

3dB Beamwidth Peak - 3dB

10dB Beamwidth Peak - 10dB 120 (eg)

60 (eg)

Peak Peak - 3dB

Peak

Peak - 10dB

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3dBm HORIZONTAL BEAMWIDTH Directional Antenna 65/90/105/120 Omni 360 Omni-directional Directional

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3dBm VERTICAL BEAMWIDTHOmni-directional Directional

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BEAMWIDTH

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ANTENNA STRUCTURE TYPESOmni-directional Directional

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RADIATION PATTERN

Typical Flat-Panel Antenna

Typical Omni Antenna ZTE University

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TWO TYPES OF DIVERSITY

1. SPACE DIVERSITY

2. POLARIZATION DIVERSITY

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POLARIZATION

Vertical

Horizontal

+ 45degree slant

- 45degree slant

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SPACE DIVERSITY

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POLARIZATION DIVERSITY

V/H (Vertical/Horizontal)

Slant (+/- 45)

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TYPES OF ANTENNA

Linear Polarization,vertical

X Polarization, s45r

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ANTENNA DOWN TILT

Mechanical down tilt Fixed electronic down tilt Adjustable electronic down tilt

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