The Study Of Coupling Suppression Methods And Analysis Of Plane Transmission Lines

With the rapid development of high-speed,high-density,high-frequency and wide-band frequency bands in radio frequency microwave systems,the integration and distribution density of components are getting higher and higher.The problem of electromagnetic compatibility among various electronic components has become increasingly prominent.How to ensure the normal operation of electronic components while suppressing the crosstalk between various electronic components has become a research hotspot.Planar transmission lines are widely used in RF microwave systems due to their advantages of simple structure,small size,light weight,good integration,and high reliability.Therefore,it is significant to study the crosstalk between plane transmission lines.Based on the above research background,some works of the paper is as follows:(1)Aiming at the problem of serious coupling between planar parallel transmission lines,the S-shaped defected microstrip structure is used to suppress the coupling between plane parallel transmission lines.First,the full-wave analysis method was used to study the coupling characteristics of adjacent planar parallel transmission lines.Then,close-range plane parallel transmission lines are taken as the research object,and the S-shaped defected microstrip structure is used for coupling suppression.Again,the full-wave analysis method was used to analyze the designed decoupling structure.The results showed that the loaded S-shaped defected microstrip structure can effectively inhibited the coupling between the plane parallel transmission lines.Finally,according to the circuit theory,the equivalent circuit model of the designed structure is extracted,and the equivalent circuit modeling of the plane-parallel transmission line of the S-shaped defected microstrip structure is simulated by using circuit simulation software(ADS).The simulation results of ADS agree well with the results of electromagnetic simulation(HFSS),which verifies the correctness and effectiveness of the equivalent circuit model of plane-parallel transmission lines with loaded S-shaped defected microstrip structure.In order to further verify the correctness and effectiveness of the designed structure,the S-shaped defected microstrip structure of the plane parallel transmission lines are processed and measured.The test results are consistent with the HFSS simulation results.(2)Aiming at the coupling problem between plane bending transmission lines,the coupling effect of bending angle and transmission line length of the plane bended transmission lines are studied.A method of loading the port-shaped defected microstrip structure on the plane bended transmission lines are proposed to achieve the suppression of the crosstalk.First,the planar ladder and Z-shaped bended transmission lines are modeled by using the full-wave analysis,and the coupling of two types of plane bended transmission lines at different bending angles is analyzed.And choose the weakest coupling angle,analyze the influence of the coupling of the change of the transmission line length between the two types of plane bended transmission lines,and provide the design basis for the wiring of plane bended transmission lines in the actual project.Then,the port-shaped defected microstrip structure was integrated on these two types of plane bended transmission lines,the far-end and near-end coupling between the folded transmission lines is reduced.Finally,the equivalent circuit model of the designed structure is extracted,and the equivalent circuit modeling of the planar bended transmission line with the loading port-shaped defected microstrip structure is modeled by using ADS.The ADS simulation results are consistent with the HFSS simulation results,and the correctness and effectiveness of the designed decoupling of the plane bended transmission line is verified.