low-frequency head

例句：

1. 1.The device has a low-frequency head, which can detect the presence of objects in the surrounding area.
   该设备具有低频头，可以检测周围区域物体的存在。
2. 2. In the field of radio engineering, the low-frequency head is used to measure the strength of radio signals.
   在无线电工程领域，低频头用于测量无线电信号的强度。
3. 3. The low-frequency head is an important component of the radar system, which helps to detect and track targets in the air.
   低频头是雷达系统的一个重要组成部分，它帮助探测和跟踪空中目标。