摘要
无线电发射机输出的射频信号功率,通过馈线(电缆)输送到天线,由天线以电磁波形式辐射出去。电磁波到达接收地点后,由天线接下来(仅仅接收很小很小一部分功率),并通过馈线送到无线电接收机。可见,天线是发射和接收电磁波的一个重要的无线电设备,没有天线也就没有无线电通信。
radio frequency signal power output by a radio transmitter is transferred to an antenna by a feeder（cable）,which is radiated by the antenna in the form of electromagnetic waves.When the electromagnetic wave arrives at the receiving location,the antenna is followed by a small,very small amount of power.It is seen that the antenna is a very important radio equipment for transmitting and receiving electromagnetic waves.Antenna variety,for different frequencies,different uses,different occasions,different requirements,etc.
出处
《数字通信世界》
2015年第11期41-44,共4页
Digital Communication World
