Research Of Transmission Line Conversion Structure Based On New Processing Technology

The rectangular micro-coaxial transmission structure has the characteristics of ultra-wideband,non-dispersion,low loss,high power capacity and high isolation.The design and implementation of components based on the rectangular micro-coaxial has become an important direction for the development of current wireless communication technology.In the processing,measurement and engineering realization of wireless communication circuits,equipment and systems,the transmission line conversion structure can realize the interconnection and matching between various types of transmission lines,and its performance directly affects the performance indicators of the entire system.Based on the new processing technology,this paper analyzes,designs and tests several transmission line conversion structures.The specific contents are as follows:(1)Design and analysis of rectangular micro-coaxial to microstrip conversion structureFirst,the characteristics and processing technology of the rectangular micro-coaxial transmission structure are introduced,and a five-layer structure is selected for the conversion structure design.A rectangular micro-coaxial to microstrip direct lap conversion structure is designed,and on this basis,a gold band is used to surround the pressure connection to improve the performance of the conversion structure.The response surface analysis method is used to extract the fitting formulas between the equivalent circuit parameters and the design dimensions of the rectangular micro-coaxial to microstrip gold band around crimping conversion structure.The simulation results show that in the frequency range of 0 ? 26 GHz,the return loss of the rectangular micro-coaxial to microstrip gold band around crimping conversion structure is better than 22 d B and the insertion loss is better than 0.8 d B.The conversion structure has good conversion performance.(2)Design and analysis of rectangular micro-coaxial to coplanar waveguide conversion structureBased on the measurement requirements of rectangular micro-coaxial devices and circuits,a rectangular micro-coaxial to coplanar waveguide conversion structure is designed.The simulation results show that in the frequency range of 20 ? 40 GHz,the return loss is better than 21 d B and the insertion loss is better than 0.4 d B.The conversion structure has good performance.In addition,the coplanar waveguide to microstrip conversion structure,rectangular micro-coaxial impedance transformation structure and microstrip impedance transformation structure are also designed,and the 20 ? 40 GHz rectangular micro-coaxial to coplanar waveguide to microstrip conversion structure is laps.In the operating frequency band,the return loss is better than 20 d B and the insertion loss is better than 0.4 d B.It has good conversion performance.(3)Design and Validation of Rectangular Coaxial Conversion Structure Based on 3D PrintingDue to the immature processing conditions of the rectangular micro-coaxial structure,the lower frequency range of rectangular coaxial to circular coaxial conversion structure and rectangular coaxial to microstrip conversion structure are designed and processed by frequency shifting and using 3D printing and surface metallization technology.By comparing the simulation results with the measurement results,the causes of the error are analyzed,the improvement ideas are put forward,and the application of 3D printing in metal microwave device processing is explored.