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天线是接收和发射无线电信 号必不可少的设备。国内外新近 研发出一些新型天线，介绍如下： 汽车用自动定向天线 这是 一种同时采用四个天线的自动走 向天线系统。其在接收信号时不 需要每次进行调整。它采用了空 间跟踪雷达的相控天线阵技术， 找到最佳信号后四个天线相位同
The antenna is an essential device for receiving and transmitting radio signals. Recently, some new types of antennas have been developed at home and abroad. The introduction is as follows: Auto directional antennas for automobiles This is an automatic antenna system that uses four antennas at the same time. It does not need to be adjusted each time it receives a signal. It uses the space-controlled radar phased array antenna technology, find the best signal after the four antennas with the same phase