Variable Beam-forming Network Of Key Technology Research,

In order to take full advantage of useful signal and inhibit interference signals, the variable beam forming network (VBFN) makes array beam point at the direction of expectations and side-lobe point at the direction of interference signal through array weighting method. Besides, VBFN adjust the beam shape to change beam coverage area. Therefore variable beam forming network (VBFN) is one of important research area in modern communication, mobile communication and radar system. This dissertation focuses on the investigation of the variable power divider (VPD) and adjustable phase-shifter which is the key component of VBFN.Firstly, the mixed central directional coupler and branch lines directional coupler is discussed and the equivalent circuit model of the varactor diode is analyzed. Secondly, the VPD and adjustable phase-shifter is designed using varactor diode and directional coupler. Finally, the VPD and adjustable phase-shifter are simulated and developed, the measured results show that the power change is less than 7dB in the operating frequency band , and the phase-shift range of the adjustable phase-shifter is about 100 degrees.