Advanced Extremely High Frequency System的用法和样例：
- Raytheon Company (NYSE: RTN) and the U.S.Army recently completed successful testing of the first Advanced Extremely High Frequency, or AEHF, satellite communications production terminals.
- The seismicity in Yunnan region in the 20th century occupies a front place in Chinese mainland in extremely high frequency, strength and hazard rate.
- The very high frequency system placed transmitters in patrol cars to enable patrolmen to communicate with headquarters and other cars instead of just receiving calls.
- In order to apply to the high frequency system, not only the complete design process of the housing of filter, but also the improvements and the measurement results are presented in this thesis.