Research On Electromagnetic Scattering And Novel Imaging Technology Based On Vortex Electromagnetic Waves

Due to vortex Electromagnetic waves have lots of limitations.For example,the hollowing of the beam while generating the vortex electromagnetic waves,the generation method of the vortex electromagnetic waves,and the distortion of the vortex electromagnetic waves in transmission.The vortex electromagnetic waves have not been deeply studied in many aspects because of these.As the technology of vortex electromagnetic waves becomes more and more mature,the research on vortex electromagnetic waves gradually rises.In this dissertation,the scattering characteristics of vortex electromagnetic waves and the three-dimensional imaging method of vortex electromagnetic waves,which have not been studied deeply,are studied.The main contents are as follows:(1)The characteristics of the vortex electromagnetic wave and the generation method of the vortex electromagnetic wave are studied,and an achievable and easy-togenerate UCA array vortex electromagnetic wave generation scheme is proposed and verified by simulation.(2)The scattering characteristics of vortex electromagnetic waves are studied,and the scattering calculation steps of physical optics method are introduced.(3)The influence of size of the object placed in front of the vortex electromagnetic wave,on the distortion of the vortex electromagnetic wave mode is studied,and a vortex electromagnetic wave detection method that reflects the size of the measured object is discussed,which is compared with the traditional RCS measurement method.(4)The data collection of MIMO,MISO and SIMO during the imaging process of ordinary vortex electromagnetic waves is studied,and the differences in imaging are discussed.In the follow-up,a three-dimensional imaging method is proposed,which rotates and ascends to provide two dimensions of azimuth and height.Also,combined with the three imaging methods,that have been investigated,in order to yield a feasible imaging protocol.