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1.引言最近,大城市开始成排地盖起高层大楼来了。为了消除由此而产生的重影干扰,美国正在试验圆极化广播。比如,美国广播公司WLS电视台正在芝加哥新建成的西尔塔上装设圆极化天线进行试验,就是一例。无线电通信中使用圆极化的事例是三十年前在航空通信中用过,
1. INTRODUCTION Recently, big cities started to build up high-rise buildings in rows. The United States is experimenting with circularly polarized broadcasts in order to eliminate the ghosting interference that ensues. For example, ABC television station WLS is installing a circularly polarized antenna in Chicago’s newly built Serta for testing. The use of circular polarization in radio communications was used in aviation communications three decades ago,