| Design of mode converter is a basal task on microwave transmission, many kinds of mode converters have been developed by scholars in the world and widely used in microwave and millimeter wave equipments and circuits. The research on mode converters is mainly on rectangular waveguide, circular waveguide, coaxial waveguide etc.In1989,a new type of transmission line, circular groove waveguide, was put forward by Southeast University for the first time. This waveguide has many advantages, such as large dimensions, high power handling, wide bandwidth and low losses. Compared with usual groove waveguide, circular groove waveguide with particular circular groove boundary fits to connect with round devices. But the problems of connecting rectangular waveguide with circular groove waveguide are often met, a kind of mode converter that converts rectangular waveguide ( mode) to circular waveguide ( mode) is necessary. In this thesis, a kind of new type -- converter is presented and optimized.Circular groove waveguide is analyzed and the vector finite element method and the modal expansion method are applied to analyzed N-port waveguide junction, then to two-port mode converter. Based on the theory analyse, 2450MHz and 915 MHz -- converter and - - converter are optimized by use of HFSS and Optimetrics software. Finally products of mode converter in literatures are calculated and optimized with same calculation method of software. The calculated results and measured results are accordant. Thereout, the validity of calculation and optimization method with software is validated. Finally 915 MHz -- converter is analyzed on its sections, that provides methods of machining . TE1 1TE1 (11)TE1 1TE1○1 TE1(11)TE1 1TE1○1... |
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