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天线是一切无线通信不可缺少的设备,天线增益是影响无线通信距离的重要因素之一.天线增益增加3分贝意味着在发射机功率不变的情况下,接收功率提高了一倍.移动通信中基地台需要使用高增益全向天线.这种天线的方向图在水平面内是个圆,亦即在距离发射台等距而方位角不同的诸接收点上,具有相同的功率送入接收机.
Antenna is an indispensable device for all wireless communications. Antenna gain is one of the important factors that affect the wireless communication distance.Antenna gain of 3 dB means that the receive power is doubled with the transmitter power unchanged. The base station requires the use of a high-gain omnidirectional antenna whose antenna pattern is circular in the horizontal plane, that is, on the receiving points at different distances from the transmitting station and at different azimuths, the same power is fed into the receiver.