free-space loss

例句：

1. 1. In the early days of satellite communication, the free-space loss was a significant factor in determiningthe overall performance of the system.
   在卫星通信的早期，自由空间损耗是决定系统整体性能的一个关键因素。
2. 2.The design of the antenna array aims to minimize the free-space loss and improve the signal strength at the receiver.
   天线阵列的设计旨在最小化自由空间损耗，并提高接收机处的信号强度。
3. 3. Due to the high density of radio waves in urban areas, the free-space loss is much higherthan in rural areas.
   由于城市地区的无线电波密度较高，自由空间损耗远高于农村地区。