Study Of The Eletromagnetic Force And Torque Based On Microwave-driven Metamaterial

With the development of micro-eletro-mechanical system(MEMS) towarding the direction of miniaturization and high-frequency, the theory of traditional dirves cannot adapt to the physical condition,which needs wireless communication at microwave region. The metamaterial,which displays novel physics properties and efficient adjustment method,has become a proper candidate in micro-driven system. In this thesis, we focus on the electromagnetic force and torque of broadside-coupled split ring resonators and gammadion metamaterial, which can be applied in linear and vertical driven system respectively.In the research of broadside-coupled split ring resonators, it calculated the different directions of electromagnetic force in the structure and the results indicated that the force at the resonance frequency was obviously stronger in every direction of plates, which could reach 100 times compared with parallel-plate metallic cavity. Using the retrieval method and electromagnetic field analysis, we described the effect of electromagnetic force enhancement. For the whole structure, the amplitudes of the electromagnetic force in both front plate and back plate were repulsive, which caused it balanced in x and z direction. And In y direction, however, the electromagnetic force showed superposition effect in both front plate and back plate.We also analyzed the laws varing with structural parameters and the result indicated that lower metal line width and higher permittivity of substrate not only suppressed the net force in x and z direction, but enhanced the superposition effect in y direction too.In the research of gammadion structure, it analyzed the energy flow distribution and calculated the electromagnetic torque of the structure in 1-10 GHz region at two work models. The results showed that the density of electromagnetic forces were both mainly distributed on the edge of arms, which had equivalent amplitude and opposite direction at two work models. It also indicated that the electromagnetic torque in z direction could be higher by introducing the electric resonance. The transformation disciplines of parameters, such as the thichness of dielectric substrate and metal gap width, was investigated and it showd that the electromagnetic torque was proportional to the augment of metal gap at0.6mm thickness of dielectric slab.