The Researches On Broadband Millimeter-wave Spatial Power-combining Amplifier Based On Waveguide

Waveguide-based spatial power combining project mainly focus on the problem of how to combine power inside the waveguide within the frequency bands of millimeter wave. It has considerable application prospects and can be widely used in navigations and high-power solid-state source of civil electronic equipments on millimeter wave band. The loss of spatial power combining is independent of the device number. Therefore, within the bands of microwave and millimeter wave, the traditional integrated combiner can be gradually replaced by the space power combiner.In the frequency of Ka band, the size of the standard waveguide is too small. Thus, how to break through the size limit of waveguide is one of the key problems that need to solve. Therefore, how to achieve higher usable power output in higher frequency band, which will make this technology really step into millimeter wave band, is the main research direction. Based on the above content, this paper mainly researches the space power amplifier working in the bandwidth from 31 GHz to 36 GHz.Firstly, the research progresses in spatial power combining technology are reviewed, and the convert methods of waveguide, finline to microstrip are also given.Secondly, the basic concepts of microstrip and finline are introduced as theoretical basis.Finally, based on waveguide, a broadband millimeter-wave space power amplifier combiner is studied and designed. The research contents of this paper includes as follows:1, According to the requirements of the space power combining, conversion and combin circuit from waveguide to microstrip is studied and a conversion circuit with one waveguide input and multiple microstrip output is realized which can ensure resonance does not occur within the broadband.2, For the requirement of amplifier, the MMIC amplifier placed outside the waveguide, bias and heat dissipation problems are solved.3, Considering the installation of a waveguide finline, engineering problems in practical application are considered.Waveguide space power combining technology takes use of mechatronics design, and fully considers the influences of various factors. This work has laid a good foundation for the developments of the spatial power combining technology within the waveguide.