Chapter 4 Antenna & Feeder Subsystem; Overview; Rf Antenna & Feeder; Antenna - Huawei Airbridge BTS3612A-1900 Technical Manual

Technical Manual
Airbridge BTS3612A CDMA Base Station
Chapter 4 Antenna & Feeder Subsystem

4.1 Overview

The BTS antenna & feeder subsystem consists of two parts: the RF antenna & feeder,
and the satellite (GPS/GLONASS) synchronization antenna & feeder. The former
transmits the modulated RF signals and receives MS signals, while the latter provides
precise synchronization for the CDMA system.
4.2 RF Antenna & Feeder
The RF antenna & feeder of the BTS is composed of antenna, jumper from antenna to
feeder, feeder, and the jumper from feeder to cabinet-bottom, as shown in Figure 4-1.

Antenna

Jumper
Feeder
Jumper
Figure 4-1 Structure of RF antenna & feeder
4.2.1 Antenna
Antenna is the end point of transmitting and start point of receiving. The type, gain,
coverage pattern and front-to-rear ratio of the antenna all will affect the system
performance. The network designer should select antenna properly based on the
subscriber number and system coverage.
Sector
α
Sector
β
BTS cabinet
4-1
Chapter 4 Antenna & Feeder Subsystem
Sector
γ
System Principle