The document summarizes the key components of a CDMA antenna and feeder system. The system comprises antennas, antenna jumpers, main feeders, lightning arresters, cabinet-top jumpers, and grounding parts. Antennas have electrical properties like frequency range, impedance, VSWR, polarization, and gain. They also have mechanical properties like dimensions, weight, operating temperature range, and lightning protection. Common antenna types include directional and omnidirectional antennas. The main feeder connects the antenna to other components and has specifications for material, maximum frequency, impedance, and bending radius. A GPS antenna feeder system is also included to capture clock signals for CDMA use.

1. VIII.CDMA Antenna & Feeder System

2. CDMA Antenna and Feeder System 3.1 Antenna Introduction 3.2 BTS Antenna System 3.3 Antenna Technical Parameters 3.3.1 Electrical Properties 3.3.2 Mechanical Properties 3.4 Antenna Development

3. Antenna Introduction Antenna is a structure or device used to collect or radiate electromagnetic waves. Transmission radiates electromagnetic energy into space Reception collects electromagnetic energy from space

4. Antennas are widely used in our society Mobile Communication Satellite Communication Wireless Radio Wireless Television Radar

5. In two-way communication, the same antenna can be used for transmission and reception the RF antenna System of the BTS GPS Antenna System BSSB Antenna System

6. BTS Antenna System Antenna System Structure Antenna Types

7. Antenna System Structure the antenna feeder system comprises antenna, antenna jumper, main feeder, lightning arrester, cabinet-top jumper, grounding parts and others.

8. Antenna Technical Parameters Usually, antenna has two kinds of technical parameters:  Electrical Properties  Mechanical Properties

9.  Frequency Range  Impedance  VSWR  polarization  Gain  Beam width  Front to Back Ratio  Up Side Lobe suppression and Null Fill Electrical Properties

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. Frequency Range CDMA 800 : 824-896MHz CDMA 1900 : 1850-1990MHz

14. BANDWIDTH = 896 - 824 = 72MHz Optimum 1/2 wavelength for dipole at 860MHz at 896 MHz Antenna Dipole at 824 MHz

15. Impedance 50  Cable 50 ohms Antenna 50 ohms

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

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. 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. Gain characterizes the ability of a antenna to radiate and collect electromagnetic energy.

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. Horizontal Beamwidth Directional Antenna ： Omni Antenna ： 360° 65°/90°/105°/120 °

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)

36. Null Fill

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. Dimensions Weight Radome Material Color  Operating Temperature Range Storage Temperature Range Mechanical Properties

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

48. Lightning Protection  DC Grounded

49. Lightning rod A grounded metal rod can prevent damage by conducting lightning to the ground ； It is placed on top of the structure

50. Lightning rod The radio frequency antenna must be installed within the 45  protection angle for arrester ；

51. Antenna Types A directional antenna An Omni-directional antenna

52. 1/2 jumper ½ jumper is used between cabinet-top and the main feeder cable , between the main feeder and antenna ;

53. 1/2 jumper ’s properties Specification ： ½ foamy medium cable; Maximum working frequency ： 2000MHz; Resistance ： 50  ; Wastage per 100m ： <7.5 dB; One-time bending radius ：  32mm;

54. The main feeder The minimum bending radius of the main feeder should not be less than 20 times the length of the radius of the main feeder One-time bending, the minimum bending radius is 90mm. The minimum bending radius of repeated bends is 200 mm.

55. The main feeder’s properties Specification ： 7/8 foamy medium cable Maximum working frequency ： 2000MHz Resistance ： 50  Wastage per 100m ： <4.0 dB one-time bending radius ：  90mm

56. The three feeder clip Installing the three-feeder clips every 1.5 meters along the iron tower or cabling rack; The maximum spacing between the hangers is 1.65m.

57. The main feeder

58. Lightning arrester’s properties The feeder window is usually mounted on the wall outside the equipment room between the indoor and the outdoor cabling racks ; The size of the feeder cable window provided by ZTE is 400 mm  400 mm. It is a four-hole window and 12 pieces of feeder cables can pass through it. A 300 mm  300 mm hole should be drilled on the wall for the installation of this feeder cable window.

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. Lightning arrester’s properties Frequency ： 1850-1990MHz Resistance ： 50  Echo wastage ： <-25dB The maximum attacking electronic current ：  50kA The average manimum power ： 3kw

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. '' cabinet-top jumper'' cabinet-top jumpers are used between the lightning arrester connected to the main feeder and the rack ; it ’s properties are the same to the ½ antenna jumper ;

65. GPS Antenna Feeder System Composition of the GPS Antenna Feeder System

66. GPS Antenna Feeder System Capturing the clock for CDMA through the GPS signal receiver for use by the related units of the CDMA base station.