Key Techniques Of Uwb Power Distribution Network

As an important part in the field of microwave technique, microwave splitter is widely studied by domestic and abroad scholars, and there are plenty of literatures about it. However, the research on ultra-wideband (UWB) and miniaturization is relatively less. With the development of microwave technique and the trend of mass production, more and more attention is now paid on UWB and miniaturization of microwave splitter. All of the above need the simplicity of the structure of power splitter. Although the theories on the technique of UWB are already very mature, the design of microwave splitter based on them cannot meet the demands of modern development.Based on the problems above, this thesis discussed two UWB and miniature microwave splitters. The two power splitters not only have the property of UWB, but also of miniaturization. So they are very suitable for present use. The main contents of this paper are as follows:1. Researched on two kinds of structures of DC-26.5GHz resistive power splitters. The first one is based on the hexagonal resistance structure. It has the features as follows:VSWR is good and the three ports of the splitter are symmetrical. But the insert loss is large and isolation among the ports is poor. The other one is based on the symmetrical and miniature resistances on the two output pathways. It has the features as follows:VSWR of the input port is good and insert loss and isolation between the two output ports are also great. But the VSWR of the two output ports is poor.2. Designed a novel miniature2GHz～18GHz Wilkinson power splitter. In this part, the data of Wilkinson power splitter model satisfied the design specifications through the optimization by ADS. The topological structure of this power splitter was acquired by using HFSS for modeling, simulation and optimization. Choosing the model of Wilkinson power splitter became much easier by using the method above. It not only greatly reduced the process of theoretical derivation, but also improved the flexibility of the design.3. This thesis discussed the test of these UWB power splitters and analyzed the test results. Then the research work is summarized and further improvement is put forward. The test results of the UWB resistive power splitter show that the insert loss is less than7.5dB, VSWR of the three ports is better than1.6and the isolation among the ports is better than lOdB. And the test results of the UWB and miniature Wilkinson power splitter show that VSWR is less than1.4, the insert loss is less than2dB, amplitude balance is better than0.05dB and the isolation between the two outputs is better than16dB.