相位数组 Phased array
（重定向自Phased Array Radar）
相位数组(phased array)是由一群天线组成的数组。送往各个天线的信号的相对相位经过适当调整，最后会强化信号在指定方向的强度，并且压抑其他方向的强度。此技术本来是为射电天文学开发。后来也为主动电子扫描数组雷达所用。
许多地区的调幅广播电台都使用这个技术，可以限定广播的范围，减少对其他地区的干扰。
Phased Array Radar
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Phased array 相位阵列
（重定向自Phased Array Radar）
In antenna theory, a phased array is an array of antennas in which the relative phases of the respective signals feeding the antennas are set in such a way that the effective radiation pattern of the array is reinforced in a desired direction and suppressed in undesired directions. The phase relationships among the antennas may be fixed, as is usual in a tower array, or may be adjustable, as for beam steering.
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