The Structure Realization Of Electromagnetic Induced Transparent In Microwave Band And Its Application Research

With the continuous evolution of wireless communication system,the research and development needs of high-speed,high reliability,high integration,multi-function and low cost wireless communication system are increasing day by day.At present,the low frequency microwave spectrum resources are increasingly scarce,and in the high fre-quency band of microwave spectrum,digital communication technology has encountered such problems as the sharp increase of cost,the increase of power consumption,the de-cline of digital-to-analog conversion performance and the decline of communication re-liability.For these reasons,Professor Caloz from the University of Montreal in Canada creatively proposed the analog signal processing technology based on group delay multi-plexing,which is expected to develop into a new communication system other than digital communication,and the core of this technology is group delay modulation.However,in order to obtain higher group delay performance,multiple generalized transmission line units need to be cascaded,which will lead to some problems such as high insertion loss,input mismatch and large structure size.The development of the theory of electromag-netic induced transparency effect provides a new design idea for the realization of large range and high performance control of group delay.Electromagnetic induced transparency was firstly obtained by quantum interference effect,which generated a transparent spectrum in a wide range of absorption spectrum.Subsequently,many researchers used the classical physical system to simulate the elec-tromagnetic induced transparency effect.The development of electromagnetic induced transparency effect was very rapid,but at present,the multi-band realization of electro-magnetic induced transparency effect are mostly achieved by increasing the number of dark mode structures,which has the defect of large structure size,and the bandwidths of the realized electromagnetic induced transparency effect are relatively narrow.In addi-tion,there are few researches on the wide band electromagnetic induced transparency ef-fect and the multi-mode electromagnetic induced transparency effect,and the performance of the electromagnetic induced transparency effect still has a large space for improvement.Therefore,this dissertation takes the electromagnetic induced transparency effect as the research topic,focuses on the structural realization of the electromagnetic induced trans-parency effect,the group delay modulation of the electromagnetic induced transparency effect and the application of the electromagnetic induced transparency effect.The main research contents are as follows:In the research of the structure realization of the electromagnetic induced transparency effect,firstly,the single-band structure realization of the electromagnetic induced trans-parency effect in the microwave band is studied by using the periodic structures,the mi-crostrip structures and the rectangular waveguide structures respectively,which provides an effective design method for the realization of the multi-band electromagnetic induced transparency effect.Secondly,in order not to increase the size of the structure,the multi-frequency electromagnetic induced transparency effect is realized by etching the curved groove on the circular metal copper ring,and by controlling the on-off of the curved groove,a new design idea is provided for the coding design based on the electromag-netic induced transparency effect.Finally,based on the rectangular waveguide structure loading with E-plane dielectric substrate,three modes of electric induced transparency ef-fect,magnetic induced transparency effect and Fano effect are fused together to realize the three modes of electromagnetic induced transparency effect,which provides a theo-retical basis and design ideas for the realization of broadband electromagnetic induced transparency effect.In the study of group delay modulation based on electromagnetic induced trans-parency effect,the feasibility of the group delay modulation method based on electromag-netic induced transparency effect is firstly studied from the analysis of equivalent circuit model.Secondly,the control methods of group delay based on electromagnetic induced transparency effect in microwave band are studied by using periodic structures,microstrip structures and rectangular waveguide structures respectively,which provides an effective design method for multi-mode group delay control and comprehensive design.Finally,based on the form of rectangular waveguide structure loading E-plane dielectric substrate,various types of group delay curves,such as concave group delay,convex group delay and flat group delay,are designed comprehensively,which provide a technological base for the group delay control.In the study of the application of electromagnetic induced transparency effect,first of all,this dissertation puts forward a double sensing sensor based on periodic structures,which realize the function of dielectric permittivity and capacitance sensing,and the sen-sor has advantages of compact,high sensitivity,and working well under different polar-ization direction of incident electromagnetic wave.Secondly,based on the microstrip structures,a sensor for metal deformation and crack detection is proposed.The sensor can accurately locate the deformation or crack location of metal structure,which provides a new technical support for the health monitoring of metal structures.Finally,based on the rectangular waveguide structures,the multi-mode fusion filter design is studied.By combining the magnetic induced transparency effect and the Fano effect,the tunable dual-frequency bandpass filter of ”single left and double right” type is obtained.The electric induced transparency effect and magnetic induced transparency effect are fused to obtain the tunable dual-frequency bandpass filter of ”left double-right single” type.A three-mode band-pass filter is obtained by fusing the electric induced transparency effect,the magnetic induced transparency effect and the Fano effect.It provides a new design idea for the rectangular waveguide bandpass filter.This dissertation mainly introduces the structure of the electromagnetic induced trans-parency effect,and studies the group delay modulation and application of each mode of the electromagnetic induced transparency effect,which provides theoretical basis and techni-cal support for the development of the multi-mode fusion electromagnetic induced trans-parency effect.