Wcdma Wireless Repeater Rf Key Technologies

As a important complementary equipment, Repeaters have been widely used in 2G mobile communication system. Repeater can enlarge the area of mobile network usefully and reduce the cost of building network. As a RF transparent amplifier, its core technology is RF part, RF part determined the performance and cost of entire Repeater. This paper is researched about framework of RF part and several important components for WCDMA Repeater. This paper mainly concern about:Firstly, discussed the framework of wireless Repeater, which is used by company nowadays. And put forward a new twice frequency conversion framework. This framework can usefully restrain mirror noise and cost less.Secondly, researched the balance amplify framework used in design LNA for reduce the import end echo when Repeater work in low signal condition. Then discuss the theory of PLL and synthesizer, and design a synthesizer for used in the twice frequency conversion framework Repeater. Also analyzed the effect for changing the parameters of loop.Lastly, discussed the theory of designing coupling line filter. Created a new ladder framework coupling line filter, which is shorter and require less process precision than parallel coupling line filter. Base on the computer emulator's characteristic, this paper put forward a new method and flow to design coupling line filter.