| Due to the close connection between the field of optics and electromagnetism,in recent years,more and more scholars pay attention to how to apply the properties of matter in optics to microwave commun ication.Spoof surface plasmon polariton is just one of the gradually mature means under this background.In the terahertz band,researchers first simulated the unique properties of plasma in the optical field,and then used metamaterials to gradually develop the technology into low-frequency,planar and integrable directions,and integrated it into the design of microwave devices.Antenna is an important component of microwave devices,and spoof surface plasmon polariton has an inestimable application pros pect.The current technical development has gradually developed the design requirements for antennas with diversified performance,tunability and controllability,and carrying a large amount of information resources.Therefore,based on spoof surface plasmon polariton characteristics,combined with the design methods of leaky wave antennas and eddy electromagnetic beam antennas,this paper carr ied out the following research:(1)By discussing the dispersion characteristics of spoof surface plasmon polariton and analyzing the basic characteristics of classical comb cell structure,a single conductor transmission line is designed,and the mode conversion of coplanar waveguide structure is used to ensure the efficient transmission of electromagnetic energy in the range of 3.19-7.83 GHz.(2)The SSPP leaky wave antenna structure of the coupled radiation element is designed.This structure uses the near-field coupling between the parasitic radiation element and the transmission line to introduce a fixed phase diff erence between the radiation elements to control the main lobes of each frequency.The passive structure of the antenna can realize zero-crossing scanning between 6-9GHz.The scanning Angle range is from-30°to +53°.The antenna has good matching effect and high radiation efficiency.The maximum actual gain reaches9.71 dB,which is consistent with the expected effect.(3)In order to increase the flexibility of the SSPP leaky-wave antenna,the varactor diode is loaded on the side of the comb groove of the original structure to achieve controllable electric sweep in the main lobe direction.In this design,the beam direction is greatly affected by the capacitance value change,and the bandwidth is expanded with two different sizes of coupling units.Simulati on results show that when the capacitance value of the electronic control element increases from 0.1pF to 0.3pF,the radiation main lobe direction change Angle of the active SSPP leaky-wave antenna varies from 20° to 28° between 6-6.6GHz.Radiation efficiency has always been maintained above 83.5%.(4)In order to explore the antenna to improve spectrum efficiency,application of surrounding electromagnetic radiation cell array excitation principle of vortex beam based on SSPP in(2)transmission line,des ign of ring feeding network,annular feed network is proved from the theory can provide radiation array yuan vortex beam excitation condition of feeding way,through the coupling cell array,An 11-array three-mode SSPP vortex electromagnetic beam antenna with 5.42 GHz zero order center frequency has been developed. |
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