名词
中文翻译：方向性天线
同义词：
['directional radio', 'directional transmitter']
例句：
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1. The directionalantenna can pick up signals from different directions.
这个定向天线可以从不同方向接收信号。
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2.The directional antenna is used in radar systems to detect objects in the air.
定向天线用于雷达系统中，用来探测空中物体。
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3. The directional antenna helps to improve the signal quality of the wireless network.
定向天线有助于提高无线网络的信号质量。