Antenna system noise temperature and antennaefficiency are the most important items in the system debugging and checking before the VLBI observation.
在流动vlbi的观测试验中，天线系统噪声温度和天线效率是观测前系统调试和检测的两项重要内容。
2
Heterodyne efficiency is reduced by aberration of receiving antenna for space coherent optical communication.
空间相干光通信中接收天线像差会使光外差效率下降。
3
The radiating element of array antenna is air dielectric microstrip patch antenna, which has high efficiency, and the feed network is low loss air strip, which can reduce the loss of the feed line.