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英语翻译The directivity of an antenna can be easily estimated fr

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英语翻译
The directivity of an antenna can be easily estimated from the radiation pattern of the antenna.An antenna that has a narrow main lobe would have better directivity,than the one which has a broad main lobe,hence it is more directive.
天线的指向性可以很容易地从其辐射方向图中估测出来.
一个有狭长主波瓣的天线比有宽阔主波瓣的天线有更好的指向性,因而指向性更强