Antennas for GSM System

Contents Base station antenna specification and meanings Antenna types and trends

(Technical Data)

（ Electrical properties ） Operation 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 Insulation （ Mechanical properties ） Size Weight Radome material Appearance and color Working temperature Storage termperature Windload Connector types Package Size Lightening

Electrical properties

Wavelength 1/2 Wavelength 1/4 Wavelength 1/2 Wavelength Dipole （ Dipoles ） 1800MHz ： 166mm 900MHz ： 333mm

1 个 dipole (received power) ： 1mW Multiple dipole matrix Received power ： 4 mW GAIN= 10log(4mW/1mW) = 6dBd

Gain=10log(8mW/1mW) = 9dBi Sector antenna Received power ： 8mW Omni directional array Received power ： 1mW (Overlook) Antenna

（ Frequency Range ） GSM 900 : MHz GSM 1800 : MHz GSM dual band : MHz & MHz eg MHz ， MHz

（ BANDWIDTH ） = = 70MHz Optimum 1/2 wavelength for dipole at 925MHz at 960 MHz Antenna Dipole at 890 MHz

（ Impedance ） 50  Cable 50 ohms Antenna 50 ohms

9.5 W 80 ohms 50 ohms Forward: 10W Backward: 0.5W Return Loss ： 10log(10/0.5) = 13dB VSWR (Voltage Standing Wave Ratio) （ VSWR ）

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

（ Polarization ） VerticalHorizontal + 45degree slant - 45degree slant

V/H (Vertical/Horizontal)Slant (+/- 45°)

` （ Linear,vertical ） ` （ dual linear  45  slant ）

（ Gain ） `G`G （  、  ） =4  U （  、  ） /P A Gain ： dBi `G`G’= G A / G A0 Gain ： dBd `0`0 dBd=2.15 dBi

Dipole Ideal radiating dot source (lossless radiator) eg: 0dBd = 2.15dBi dBd and dBi 2.15dB

（ Pattern ）

（ Beamwidth ） 120° (eg) Peak Peak - 10dB 10dB Beamwidth 60° (eg) Peak Peak - 3dB 3dB Beamwidth

（ 3dB Beam width Horizontal ） Directional Antenna ： 65°/90°/105°/120 °Omni ： 360°

（ 3dB Beam width Vertical ） Directional ： Omni-directional ：

（ Down Tilt ） `Mechanical down tilt `Fixed electronic down tilt `Adjustable electronic down tilt

Demonstration of Electronic Down-tilt

Non down tiltElectronic downtilt Mechanical downtilt

(Electronic and mechanical downtilt)

（ Front to Back Ratio ） `Ratio of maximum main lobe to maximum side lobe F/B = 10 log(FP/BP) typically ： 25dB Back powerFront power

（ Upper Side lobes Suppression & Null Fill ）

（ Side lobes ）

（ Permitted Power ） `Continuous : watts `peak :n 2  p

（ Third Order Intermodulation ）  43dBm `f 1, f 2, 2f 1 -f 2, 2f 2 -f 1 913MHz,936MHz,959MHz,982MHz

1000mW ( 1W) 1mW 10log(1000mW/1mW) = 30dB （ Isolation ）

Mechanical properties

（ Dimensions ） `L  W  H `Length ： connected with vertical bandwidth and gain `Width ： connected with horizontal bandwidth `Height ： connected with techniques adopted

（ Weight ） `Affecting transmission and deploy

（ Radome Material ） `PVC, Fiberglass `Anti-temperature 、 water-proof ， anti-aging ， weather resistant

（ Colour ） `Good-looking, environment-protecting

（ Operating Temperature Range ） ` Typical range ： -40°C — +70°C

（ Storage Temperature Range ） ` Typically ： -40°C — +70°C

（ Wind Load ） ` Eg: 83N at 160 km/h

（ Connector Type ） `7/16”DIN ， N ， SMA `female

（ Mast ） `Mast diameter 45-90mm

（ Lightening Protection ） `Direct Ground

(Antenna Types and Development )

(Antenna Types) By frequency band: GSM900, GSM1800, GSM900/1800 By polarization: Vertical, Horizontal, ±45º linear polarization, circle polarization By pattern:Omni-directional, directional By down-tilt:Non, mechanical, electronic adjustment, remote control By function:Transmission, receiving, transceiving

(Antenna Development Trend) Broad band Multifunctional High Integrity

ONE ANTENNA FOR MULTIPLE BANDS ^ MHz and MHz ^Extended band option with MHz ^Dual slant ±45º polarisation ^65º horizontal beamwidth ^Band independent Teletilt™ control ^17dBi gain in both bands ^Diplexed or Non-Diplexed versions ^Mechanical downtilt mounting option

7/8” （ MAIN FEEDER ）

1/2” （ JUMP CABLE ）

7/16”DIN-F （ DIN CONNECTOR ） 7/16”DIN-M （ DIN & N CONNECTOR ）

Lightening Arrestor Rf port 2 Grounding

（ ACCESSORIES ） （ Trimming Tool or Hand Tool Kit ） （ Clamp ） （ Earthing Kit ） （ Wall Glands ） （ Hoisting Stocking ） ( Universal Ground Bar)

Antenna 7/16 Din Connector 7/8“ Cable Grounding 1/2“ Jumper Cabinet EMP Grounding clip Grounding bar 1/2 Clamp Tower Top Amplifier 7/8“ Cable Machine house 1/2 Jumper

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