散射參數(shù)法在二維超表面電磁均一化中的應(yīng)用
[Abstract]:With the development of information technology, there are more and more integrated wireless communication methods in single mobile terminal devices, such as Wi-Fi,GPS,NFC, cellular network communication, Bluetooth and so on, which requires antennas to work in multiple frequency bands. There are many methods for multi-frequency antenna operation. In this paper, the frequency reconfigurable antenna is designed with the supersurface of the two-dimensional structure, and the related problems of electromagnetic homogenization of the supersurface of the two-dimensional structure are discussed. Metamaterial is a new type of material which is composed of some special structures designed by man. It has special physical properties which are not possessed by natural materials existing in nature. The supersurface of two-dimensional structure is made into planar structure of three-dimensional metamaterials. Compared with three-dimensional metamaterials, it has the advantages of small volume and light weight. The supersurface, which is composed of periodic or aperiodic repeated elements, has special electromagnetic characteristics. The frequency, polarization and pattern of the antenna can be controlled by loading it on the antenna. In this paper, a microstrip slot antenna working in C-band is designed as a radiation antenna, and an ellipsoid with a linear, long axis / short axis ratio of 10 is designed. The ellipsoid and circular structure with long axis and short axis ratio of 3 are four different elements and can realize the reconfigurable supersurface of antenna working frequency. The supersurface is directly loaded on the microstrip slot antenna and the working reconstruction of the microstrip slot antenna is realized by rotating the supersurface and changing the relative position between the antenna and the super-surface. The CST microwave studio is used to simulate the supersurface loaded antenna, and the frequency reconfigurable range of the four structures based on the super-surface frequency reconfigurable antenna can be obtained. The frequency reconfigurable ranges of ellipsoid and circular structure with linear, long axis short axis ratio 10 and long axis short axis ratio 3 are 958 MHz / 808 MHz and 96 MHz, respectively. In this design, the supersurface with the long axis and short axis ratio of 3 ellipsoid, the microstrip slot antenna and the supersurface of the wire structure are fabricated and tested in the microwave darkroom. The simulation results are in good agreement with the test results. The reason why the antenna operating frequency can be changed by rotating the supersurface is that the relative position between the supersurface and the antenna changes the equivalent permittivity and permeability of the supersurface. The electromagnetic homogenization of the supersurface can be calculated by using the backstepping method of scattering parameters (NRW). First, the scattering parameters of the supersurface element structure are obtained by electromagnetic simulation, then the equivalent permittivity and the equivalent permeability of the element S11 and S21 are derived by using the NRW algorithm. Finally, the supersurface equivalent dielectric models of four structures are established by using these equivalent electromagnetic constants and simulated on the antenna. The results obtained are compared with the simulation results of the actual supersurface loaded antennas. The simulation results of the supersurface equivalent medium model match the simulation results of the actual model.
【學(xué)位授予單位】:哈爾濱工業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TB34;TN820;O441
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