Research And Design Of Surface Plasmon Polariton-like Based On SIW Structure

Radar system is one of the important means of electromagnetic information acquisition.It can be used in vehicles,satellites and airplanes.The increasing complexity of the future environment puts new demands on the miniaturization of radar systems.As an important component of radar systems,RF devices have restricted radar systems further development.Microstrip lines are one of the basic structures of RF devices,which cannot meet the requirements of electromagnetic development.Because mutual interference is strong and the bending loss is large.In order to solve this problem,the researchers proposed spoof surface plasmon polariton(SSPP),which is one-dimensional electromagnetic metamaterial.SSPP has the advantages of strong binding,slow wave effect and bendable propagation.It has received extensive attention in recent years.However,the proposed planar SSPP structures are all loaded with a sub-wavelength periodic structure on a conventional planar transmission line.It has advantages of low profile,flexible design,easy connection with planar circuits,etc.In addition,there are also inherent shortcomings of open or semi-open structure,such as high transmission loss and large radiation loss in the low frequency.In this paper,we propose hybrid SSPP and substrate integrated waveguide(SIW)structures.We designed many RF devices,such as transmission lines,filters,power dividers and frequency dividers.Based on the closed structure of SIW,the SSPP radiation loss is effectively reduced.At the same time,the vertical dimension of the SIW reduces due to the slow wave effect of SSPP.The hybrid structure combines the advantages of SIW and SSPP.It can be widely used in microwave circuits and device designs.The main contents and innovations of this paper are as follows:1.The design method of hybrid SIW-SSPP transmission line is studied.The dispersion characteristics,transmission characteristics and controllable characteristics of the hybrid structure are analyzed.The hybrid half-mode substrate integrated waveguide and SSPP transmission line,the hybrid folded substrate integrated waveguide and SSPP transmission line and the odd-even mode composite transmission line based on SIW-SSPP structure are designed.The various transmission lines proposed in this paper are compact,low loss,and improve transmission performance.2.The design method of hybrid SIW and surface plasmon polariton-like filter is studied.The SIW-SSPP dual-passband filter,the hybrid SIW and spoof localized surface plasmon filter,and the magnetic localized surface plasmon are designed by using physical properties of different types of surface plasmon polariton-like.The performance of the double bandpass,the wide bandpass and the double narrow bandpass are respectively realized.Prototypes were fabricated and tested.The proposed structures overcome the problems that the relative bandwidth of the SIW cavity filter and the narrow-band applications of surface plasmon polariton-like.It can be used in modern communication systems.3.The design method of hybrid SIW and effective surface plasmon(ESPP)structures is studied.The proposed RF device does not require additional angles to achieve mutual isolation of different branch signals.The isolation between different signal branches in a compact size is achieved by using the transmission characteristics of ESPP.The SIW-ESPP transmission line was verified.The SIW-ESPP frequency splitter and SIW-ESPP power divider were designed.At the same time,the transmission characteristics such as isolation and phase between different ports are analyzed.