Experimental design of vortex wave communication simulation system based on a metasurface
[Objective]Electromagnetic fields and electromagnetic waves(EMWs)cannot be seen in nature,hence,EMWs are not easy to understand for undergraduate and even graduate students.In addition,many existing formulas for EMW propagation are difficult to follow.In particular,for the newly proposed vortex electromagnetic wave and its transmission and reception,very limited examples can be referred to.To deepen our understanding of vortex electromagnetic wave propagation and understand the characteristics of vortex wave communication,an experimental scheme for vortex wave communication transmission is proposed and discussed.[Methods]First,the basic principles of vortex EM waves were introduced and discussed.Then,vortex EM wave generation was proposed using a metasurface.Then,the design of the co-polarized orbital angular momentum metasurfaces was modeled,completed,and analyzed using the CST electromagnetic simulation software,which had a size of 320 mm × 320 mm.The performance of the metasurface was presented for different response orders,phases,and sensitivity for the TE and TM waves.Second,a vortex wave communication transmission system was built using the National Instruments software-defined radio device USRP X310.The architecture of the created vortex wave communication system based on metasurfaces was introduced,and vortex wave communication was tested and verified in our lab at 10 m.[Results]The experimental results show that the designed metasurface vortex wave communication system can transmit and receive vortex waves and achieve a low bit error ratio.In addition,the mode+1 for the presented metasurface to generate a vortex EM wave was observed in the measurement.Evidently,the proposed metasurface has vortex characteristics for its phase in the operation band,ranging from 9 to 11 GHz,and the modulated and demodulated metasurfaces have opposite vertex modes,marked by"+"and"-",respectively.Moreover,the transmission performance of the metasurface to generate the vortex EM wave is demonstrated for different unit cells in the metasurface.This study elaborates on the generation,emission,transmission,and reception of vortex waves by combining simulation and experimentation.Through the simulation and experiments,the students not only understood the vortex waves but also used and designed vortex wave metasurfaces after understanding the processing of vortex waves and the application of vortex wave communication.This greatly stimulated their enthusiasm for learning vortex wave theory.In addition,we used the proposed vortex wave communication system with a distance of 10 m to transmit the binary phase-shift keying signal.A data transfer rate of up to 1 000 Mb/s was achieved without an error in the transmission.By using the vortex wave communication simulation system,the student can easily determine the vortex mode of the metasurface and understand the vortex electromagnetic wave generation,transmission,receiving,modulation,demodulation,and detection,improving the students'understanding of the modes of the vortex electromagnetic wave.[Conclusions]The method presented in this paper achieves the expected goal and greatly enhances the distance of the vortex electromagnetic wave transmission,which can reach up to 1O m.
vortex wavesco-polarized metasurface arraymicrowave anechoic chamberCST simulation softwarecommunication demonstration system
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维普
