等相位面 meaning in Chinese

constant phase front
equiphase surface

The serpentine feed is the core of a frequency scanning antenna feed system , which produce proper amplitude and phase distribution for the antenna arrays . most of all , it make the beam scanning over a large angle range by means of changing operating frequency
它为天线阵提供要求的幅度、相位分布，更为重要的是当频率发生少许变化时使线源的等相位面产生显著的倾斜，完成波束在空间扫描。