Microwave Integrated Duplexer For Mobile Communications Analysis And Design

For the practical use, this paper particularly discusses the mobile communication used microwave-integrate diplexer, focusing on' its principle, design and its measurement. The concerned diplexer features its narrow T/R channel, with a 3% relative bandwidth and narrow band between the T/R channels as well.According to the items and the costs, three kinds of diplexers with different configurations are designed, named parallel coupled, interdigital, and SIR. Based on that , a "five order" microstrip interdigital diplexer design is displayed , and the measurement is accordance with items and the simulation results, which ensure the its reliability.In this paper, the SIR diplexer is studied. It can not only reduce diplexer's size, but also features an advantage of controlling the frequency points of the spurious responses, which is very important to prevent the spurious responses from interfering the other channels in the mobile communication. For these virtus, the SIR diplexer can be used to meet a further application in the mobile communication system.