According to the requirements of the“863”key project:“Research and Development for FDD/TDD RF system and Antenna Array”, this paper focuses on the research of the RF receiver for the B3G communication system.
Results 70 patients got excellent outcomes. The spinal replacing rate of Steffee steel panel and RF system were 90.0% and 81.8% respectively, and the spinal fusion rate were 94.0% and 96.2% respectively.
This paper studies the reasons of GSM RF system drop calls from failure handover, interference, software and hardware problems. Basing on operation and maintenance experience, the author gives some ideals about how to deal with the GSM RF system drop call problems.
The influences of electron beam, RF system parameters, magnetic field, and input RF signal on output power, efficiency, bandwidth and gain are discussed.
This paper discribes the design principles and physical ideas on the RF system of an 800 MeV electron storage ring. The whole scheme and principal parameters are presented. The RF cavity design and control principle of the power source are also given.
In this paper the reflection effects which appeared in RF system of BPL on the phase measurement and phase control are described. Some mathematical expressions about the effects are obtained. A coneret method reducing the reflection effects is presented.
Recently, a kind of proton synchrotron with high repetition rate is developed and comes into wide use. But this leads to more severe requirements on the ferrites which are used in the RF system in accelerators. One of them is the time response. In this paper, the characteristic of time response and the measurement method are presented.