2005/11/15 | 方向性[Directivity]
类别(Ω〖物理〗) | 评论(0) | 阅读(19) | 发表于 20:24
The ratio of the maximum radiative power to the average radiation intensity of an antenna,

where is the beam area, R is the antenna radius, is the wavelength of radiation, and A is the antenna area.
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