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VIII.CDMA Antenna & Feeder  System
CDMA Antenna and Feeder System ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Antenna Introduction ,[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],BSSB Antenna System
BTS Antenna System ,[object Object],[object Object]
Antenna System Structure ,[object Object]
Antenna Technical Parameters ,[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],Electrical Properties
Dipoles Wavelength 1/2 Wavelength 1/4 Wavelength 1/4 Wavelength 1/2 Wavelength Dipole   1800MHz  : 166 mm   900MHz  : 333mm
Gain  = 10log(4mW/1mW) = 6dBd one dipole  Received Power : 1mW Dipole array Received Power : 4 mW
10log(8mW/1mW) = 9dBd Sector antenna Received Power : 8mW Omnidirectional array Received Power : 4mW (top view) Antenna
Frequency Range ,[object Object],[object Object]
BANDWIDTH  = 896 - 824 = 72MHz Optimum 1/2 wavelength for dipole at 860MHz at  896 MHz Antenna  Dipole at  824 MHz
Impedance ,[object Object],Cable  50 ohms Antenna 50 ohms
9.5 W Forward: 10W Reverse: 0.5W Return Loss :  10log(10/0.5) = 13dB VSWR (Voltage Standing Wave Ratio) VSWR 80  ohms 50 ohms
[object Object],[object Object],[object Object]
Polarization Vertical Horizontal Vertical Polarization: The electric field is vertical to the ground Horizontal Polarization: The electric field is parallel to the ground
+ 45degree slant - 45degree slant
Dual Linear Polarization V/H (Vertical/Horizontal) Slant (+/- 45°)
   Linear,vertical    dual linear   45   slant
Gain Definition Ratio of antenna power density at a distant  point relative to that of an isotropic  radiator as the two input power values are  the same. ,[object Object]
Gain G:   Antenna gain S 1 : P ower density at a distant point relative to antenna S 0 : Power density at the same point relative to isotropic  antenna P in1 :Input power of the antenna P in0 :Input power of the isotropic antenna
Gain Unless otherwise specified, the gain usually refers to the direction of maximum  radiation.
Antenna gain is usually expressed  in  dBi  or  dBd dBi  Gain relative to an isotropic antenna when the reference antenna is an isotropic antenna. dBd Gain relative to a half-wave dipole when the reference antenna is a half-wave dipole.  Gain
dBd and dBi half-wave dipole isotropic radiator So  0dBd  =  2.15dBi 2.15dB
A directional antenna An Omni-directional antenna Directional & Omni-directional Antenna
Beamwidth 120° (eg) Peak Peak - 10dB Peak - 10dB 10dB Beamwidth 60° (eg) Peak Peak - 3dB Peak - 3dB 3dB Beamwidth
Horizontal Beamwidth ,[object Object],[object Object]
Vertical Beam width  Directional Antenna :  Omni Antenna :
Down Tilt    Mechanical downtilt    Fixed electr. downtilt    Tunable electr. downtilt
Mechanical Down tilt    Adjust antenna mechanically to tilt lobe down
Front to Back Ratio    Main lobe max. value to back lobe max. value ratio F/B  = 10 log(forward Power/Reversed Power)   typically  :  25dB Reversed Power Forward Power
Upper Side Lobes Suppression & Null Fill
Side lobes Upper Side Lobe  Suppression  ( dB)
Null Fill
Power Capacity    Continuous :25-1500watts    Typical: 250-500watts
1000mW ( 1W) 1mW 10log(1000mW/1mW) = 30dB Antenna Port Isolation
   For same frequency 、 dual frequency , isolation of  different port >30dB
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Mechanical Properties
Dimensions    Length  Width  Depth    Length  : related with vertical beamwidth 、 gain    Width : related with horizontal beamwidth    Depth : related with adoptive technology
Weight    Affect Transportation 、 construction
Radome Material    PVC, ABS,  fiberglass    Sun Protection 、 Ice Protection , Salt protection     Burning Blocking , Anti-aging etc.
Operating Temperature Range    Typical : -40°C  —  +70°C
Storage Temperature Range     Typical : -40°C  —  +70°C
Shipping Dimensions    Length  Width  Depth
Mast    Mast diameter: 45-90mm
Lightning Protection    DC  Grounded
Lightning rod  ,[object Object],[object Object]
Lightning rod  ,[object Object]
Antenna Types A directional antenna An Omni-directional antenna
1/2 jumper ,[object Object]
1/2 jumper ’s properties ,[object Object],[object Object],[object Object],[object Object],[object Object]
The main feeder ,[object Object],[object Object]
The main feeder’s properties ,[object Object],[object Object],[object Object],[object Object],[object Object]
The three  feeder  clip ,[object Object],[object Object]
The main feeder
Lightning arrester’s properties ,[object Object],[object Object]
Lightning arrester For the wide-band lightning arrester that need not be grounded separately, you may directly connect it in serial to the place between the main feeder and the indoor cabinet top jumper. During the installation, the lightning arrester and indoor equipment as the cabling rack should be insulated.
Lightning arrester’s properties ,[object Object],[object Object],[object Object],[object Object],[object Object]
Lightning Arrester For the lightning arrester that need be grounded, a lightning arrester frame should be provided.
The installation of the lightning arrester frame
Connector  between  two accessories Feeder connector
'' cabinet-top jumper'' ,[object Object],[object Object]
GPS Antenna Feeder System  Composition of the GPS Antenna Feeder System
GPS Antenna Feeder System  ,[object Object],[object Object]

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02 cdma antenna and feeder system

  • 1. VIII.CDMA Antenna & Feeder System
  • 2.
  • 3.
  • 4.
  • 5.
  • 6.
  • 7.
  • 8.
  • 9.
  • 10. Dipoles Wavelength 1/2 Wavelength 1/4 Wavelength 1/4 Wavelength 1/2 Wavelength Dipole 1800MHz : 166 mm 900MHz : 333mm
  • 11. Gain = 10log(4mW/1mW) = 6dBd one dipole Received Power : 1mW Dipole array Received Power : 4 mW
  • 12. 10log(8mW/1mW) = 9dBd Sector antenna Received Power : 8mW Omnidirectional array Received Power : 4mW (top view) Antenna
  • 13.
  • 14. BANDWIDTH = 896 - 824 = 72MHz Optimum 1/2 wavelength for dipole at 860MHz at 896 MHz Antenna Dipole at 824 MHz
  • 15.
  • 16. 9.5 W Forward: 10W Reverse: 0.5W Return Loss : 10log(10/0.5) = 13dB VSWR (Voltage Standing Wave Ratio) VSWR 80 ohms 50 ohms
  • 17.
  • 18. Polarization Vertical Horizontal Vertical Polarization: The electric field is vertical to the ground Horizontal Polarization: The electric field is parallel to the ground
  • 19. + 45degree slant - 45degree slant
  • 20. Dual Linear Polarization V/H (Vertical/Horizontal) Slant (+/- 45°)
  • 21. Linear,vertical  dual linear  45  slant
  • 22.
  • 23. Gain G: Antenna gain S 1 : P ower density at a distant point relative to antenna S 0 : Power density at the same point relative to isotropic antenna P in1 :Input power of the antenna P in0 :Input power of the isotropic antenna
  • 24. Gain Unless otherwise specified, the gain usually refers to the direction of maximum radiation.
  • 25. Antenna gain is usually expressed in dBi or dBd dBi Gain relative to an isotropic antenna when the reference antenna is an isotropic antenna. dBd Gain relative to a half-wave dipole when the reference antenna is a half-wave dipole. Gain
  • 26. dBd and dBi half-wave dipole isotropic radiator So 0dBd = 2.15dBi 2.15dB
  • 27. A directional antenna An Omni-directional antenna Directional & Omni-directional Antenna
  • 28. Beamwidth 120° (eg) Peak Peak - 10dB Peak - 10dB 10dB Beamwidth 60° (eg) Peak Peak - 3dB Peak - 3dB 3dB Beamwidth
  • 29.
  • 30. Vertical Beam width Directional Antenna : Omni Antenna :
  • 31. Down Tilt  Mechanical downtilt  Fixed electr. downtilt  Tunable electr. downtilt
  • 32. Mechanical Down tilt  Adjust antenna mechanically to tilt lobe down
  • 33. Front to Back Ratio  Main lobe max. value to back lobe max. value ratio F/B = 10 log(forward Power/Reversed Power) typically : 25dB Reversed Power Forward Power
  • 34. Upper Side Lobes Suppression & Null Fill
  • 35. Side lobes Upper Side Lobe Suppression ( dB)
  • 37. Power Capacity  Continuous :25-1500watts  Typical: 250-500watts
  • 38. 1000mW ( 1W) 1mW 10log(1000mW/1mW) = 30dB Antenna Port Isolation
  • 39. For same frequency 、 dual frequency , isolation of different port >30dB
  • 40.
  • 41. Dimensions  Length  Width  Depth  Length : related with vertical beamwidth 、 gain  Width : related with horizontal beamwidth  Depth : related with adoptive technology
  • 42. Weight  Affect Transportation 、 construction
  • 43. Radome Material  PVC, ABS, fiberglass  Sun Protection 、 Ice Protection , Salt protection  Burning Blocking , Anti-aging etc.
  • 44. Operating Temperature Range  Typical : -40°C — +70°C
  • 45. Storage Temperature Range  Typical : -40°C — +70°C
  • 46. Shipping Dimensions  Length  Width  Depth
  • 47. Mast  Mast diameter: 45-90mm
  • 49.
  • 50.
  • 51. Antenna Types A directional antenna An Omni-directional antenna
  • 52.
  • 53.
  • 54.
  • 55.
  • 56.
  • 58.
  • 59. Lightning arrester For the wide-band lightning arrester that need not be grounded separately, you may directly connect it in serial to the place between the main feeder and the indoor cabinet top jumper. During the installation, the lightning arrester and indoor equipment as the cabling rack should be insulated.
  • 60.
  • 61. Lightning Arrester For the lightning arrester that need be grounded, a lightning arrester frame should be provided.
  • 62. The installation of the lightning arrester frame
  • 63. Connector between two accessories Feeder connector
  • 64.
  • 65. GPS Antenna Feeder System Composition of the GPS Antenna Feeder System
  • 66.