Study Of Key Technology Of Microwave And Millimeter Wave Devices Based On Spoof Surface Plasmonic Polaritons

Communication technology is of vital important in modern information technology.Driven by the wider and wider frequency bands and higher and higher communication rates,the microwave and millimeter wave devices are required highly integration,miniaturization,and multifunctional.Consequently,the higher integration will result in the emerging problems such as,crosstalk,heat generation,and quantum effects.How to address the great challenges?A new developed method,Surface plasmon polaritons?SPP?,provides an alternative solution.Spoof surface plasmon polaritons?SSPP?is a new technology developed based on SPP,which provides a new platform for the design of microwave and millimeter wave devices.SSPP not only has the advantages of high integration,small size of the electronic devices,but also has advantages of the high speed,low crosstalk,and low loss of photonic devices.However,there are also many challenges,such as large volume and low radiation power of toroidal devices,toroidal response excited at single incident angle,difficulty for modulation of surface wave group velocity,large bending loss of waveguides.To overcome these challenges,we propose some new structures based on the dispersion analyses to manipulate surface wave and plane wave,providing new methods for designing microwave and millimeter wave devices.The content of the dissertation is as below:1. To solve the problem that the toroidal dipole device has a large volume and low radiation power,we propose a compact toroidal dipole resonator.At the resonant frequency,the radiation power of the toroidal dipole response is 2 orders of magnitude higher than the radiation power of the other dipoles,and the mode field volume is 1/3 of the previous work.The sensing sensitivity of the resonator is measured to reach 0.8 GHz/RIU.2. To solve the problem that toroidal response can be excited only at single incident angle,we propose a toroidal metasurface excited at broad incident angles.The plane wave incident from 0 to 60 degrees can excite the toroidal dipole response. The sensing sensitivity of the toroidal metasurface is measured to reach 0.78 GHz /RIU.3. To solve the problem of the large bending loss of waveguides,we propose and experimentally realize a graphene-like metasurface based on SSPP where the group velocities of surface wave are adjustable with frequency.We realize a sharp corner waveguide based on graphene-like metasurface which have low reflection loss and low scattering loss.4. To overcome the challenge that it is difficult to change the diffraction direction of surface wave,we propose a SSPP hyperbolic metasurface based on magnetic response.We demonstrate the relations between dispersions and surface wave diffraction.The surface waves show normal diffraction propagation,non- diffraction propagation and anomalous diffraction propagation,respectively.5. To solve the problem of large size and large bending loss of the waveguide,we propose an ultra-compact magnetic response structure.At the resonant frequency, the compression factor of the unit cell is measured as 60,and the group velocity is 0.0025 of the speed of light in the air.The size of the proposed waveguide structure is??₀/60?×??₀/60?,which has low bending loss.