radio-frequency loss

A distress signal was sent out by air traffic control after controllers became concerned at the loss of radio contact with the plane and the speed of the plane's descent.

求救信号是空中交通管制队发出的，在这之前管控人员认为飞机与地面可能失去了无线电联系，认为飞机的飞行速度正在下降。

Simulation of the Path Loss for Radio Wave Propagation Based on MATLAB Language

基于MATLAB语言的电波传播路径损耗的仿真

Radio over Fiber system has combined the high bandwidth and low loss of optical fiber communication with the flexibility of wireless communication, will be an effective broadband wireless access solution in the future.

光载无线系统RoF（Radio Over Fiber）结合了光纤通信高带宽、低损耗和无线通信接入灵活的特点，是未来宽带无线接入有效的解决方案。

Observational evidence for stellar winds obtained from radio, infrared, visible, UV and X-ray regions are given. And two important parameters, terminal velocity and mass loss rate, are discussed.

在观测方面，给出了从射电、红外，可见光、紫外和X射线各波段得到的观测证据，并介绍了星风的两个重要参数、星风的终速和质量损失率。

Aiming at improving the spectrum utilization efficiency via employing the cognitive radio technology into practical communication, the communication system in this paper can make better use of the spectrum resources with some tolerable loss of communication efficiency.

本系统凸显了认知无线电理论运用于实际通信中对频谱利用率的提升，使系统内的用户能够在损失少量通信实时性的情况下高效地利用频谱资源。