Research And Design Of The Fullband Waveguide Power Dividers

Power divider is a kind of significant microwave passive components, which are widely used in microwave equipment, such as phased array radar, antenna feeder system and power amplifier. Although power divider is mainly used for the power distribution and synthesis, it is also used as a power tuner and the input terminal of the duplexer.Power divider can be divided into two major categories of waveguide cavity and microstrip, the waveguide cavity power divider is wide popularity for its low loss, high power capacity and transmission bandwidth and so on, but it also has some shortcomings,including its volume is too large, high cost to process, not easy integration.Microstrip power dividers with low cost, small volume, stable performance, easy to integrate the advantages of other active circuit, widely used in the field of system integration and miniaturization of microwave, but the lack of transmission power and the insertion loss too big also affects its application.The important working parameters of power divider include input port reflection coefficient, the phase between output ports, the insertion loss in work-band, the isolation of ports, the size of device and other technical indicators.At present, the research of waveguide power divider has achieved fruitful results.The structure of this paper is divided into five chapters, the first chapter is about the research background and development status. In chapter two, we will introduce the theoretical analysis of the characteristics of the power dividers and the odd-even mode analysis method is also presented in this paper. In the end, we will analyze the theoretical of power divider and the broadband transmission theory.In the third chapter,we will simulate two traditional waveguide power dividers, finally put forward and designed a new type of broadband H-E plane waveguide power divider, it can work in ka-band with the relative bandwidth of 36.14%, the phase of the two output ports are same, the product has been processing test. In the fourth chapter,combining the ridge waveguide and multistage impedance matching theory, through to the initial power divider model to explore and improve, finally designed a new full bandwidth E-H plane waveguide power divider. the working range is from 26.4 GHz to 40 GHz,has realized the full bandwidth transmission. Its insertion loss in passband is lower than-0.25 dB,the phase of the two output ports are difference of 180°, eventually processing powerdivider is compact and the test results are as such as the simulation results.The power divider can be used in the occasion that the input is not in the same plane with the output port.