详细解释:【电】 定向天线
英语解释：
名词 directional antenna:
an antenna that transmits or receives signals only in a narrow angle例句：
A radio receiver and directional antenna used as a system to determine the angular direction of incoming radio signals.无线方向探测器一种无线电接收和指向天线系统，用来确定收到的无线电信号的角方向