Research On H-Plane Compressed Rectangular Waveguide Junction Circulator

Since junction circulator was proposed in 1950's, many kinds of junction circulators have been developed by scholars and engineers in the world and widely used in microwave and millimeter-wave equipments and circuits. H-plane rectangular waveguide junction circulators have been widely studied and used because rectangular waveguide is mostly used in practical engineering. In order to satisfy the miniature structure and other special requirements, compressed rectangular waveguide becomes a more and more widely-used waveguide transmission line. So compressed rectangular waveguide junction circulator is mainly studied in this thesis.In this thesis, we introduced the method of analyzing an N-port waveguide junction by hybridizing the vector finite element method and the model expansion. Meantime we mainly dealt with the rectangular waveguide junction circulator, including the structure of the junction cavity and microwave ferrite and bias magnetic field. Based on the basic theory of circulator, and utilizing the software ANSOFT HFSS, we can optimize the circulator. On the basis of theoretical analysis results, we successfully manufactured L band and Ku band H-plane compressed rectangular waveguide junction circulators.