Design Of Power Plane And Microwave Sensor Based On Electromagnetic Surface Unit Structure

Electromagnetic bandgap(EBG)structure is a typical artificial electromagnetic material structure.Due to its own bandgap characteristics,it has been extensively studied and applied in recent years.In this paper,EBG structure is applied to the design of power plane and microwave microfluidic sensor.The main research work and progress are as follows:The first part is to propose a new type of planar EBG structure.The adjacent unit EBG structure is connected by an S-shaped bridge,and when the suppression depth is-45 d B,the suppression bandwidth range of the EBG structure to the simultaneous switching noise in the power distribution network is from 0.28 GHz to 25 GHz.At the same time,the equivalent circuit model of the EBG structure is given,and its upper and lower cut-off frequencies are analyzed respectively.Finally,the signal integrity of the EBG structure is analyzed by single-ended signal and differential signal transmission respectively.The second part is to propose a microwave microfluidic sensor based on EBG structure.At the resonant frequency point,the coplanar waveguide transmission line can excite both EBG structures.Two kinds of microfluidic channels are designed according to the distribution path of the strong electric field.The second type of microfluidic channel can achieve better frequency offset effect when the volume fraction of distilled water in the mixed solution increases from 10% to 90%.Finally,the experimental data is fitted to obtain the relationship expression between the relative permittivity of the mixed solution and the resonance frequency of the microfluidic sensor.The third part is to propose an antenna microfluidic sensor based on EBG structure.The groove of the sensor is formed by etching the substrate material downward on the surface of the EBG structure.Injecting liquid samples with different dielectric constants into the groove will cause the change of reflection phase,and then affect the change of reflection coefficient of microstrip antenna,so as to characterize the liquid samples with different dielectric constant.Finally,the microfluidics sensor is compared with previous similar papers in terms of size and sensitivity.In summary,this paper carried out a series of researches on the application of EBG structure in power plane and microwave microfluidic sensor,and gave the corresponding theoretical analysis and simulation results.Finally,the experimental results were compared,which showed good consistency.