Research On Devices Based On Graphene And Wideband Frequency Selective Surface

In recent years, as competition in the wireless communications, communication develops in the direction of multi-band, broadband. The demand for communication device is capable of versatile work increases. Moreover, the rapid development of wireless communication technology, modern wireless communication systems has been put higher requirements. Multi-band, multi-function wireless devices become popular for scholars at home and abroad.This paper describes background and status of development at home and abroad of the graphene devices and ku-band frequency selective surface.Then introduced the theoretical basis of this paper. First, we study the graphene conductivity model, and derive principles of reconfigurable conductivity of graphene. Then study the microstrip patch antenna theory, which is the theoretical basis for the THz graphene microstrip patch antenna. Finally, we study the split ring resonator theory with equivalent circuit and its equivalent circuit of complementary structure.This paper proposes a dipole antenna based on graphene and its antenna array. By adjusting the conductivity of grapheme, we can achieve reconfigurable frequency and achieve a novel THz antenna which has a switching characteristic. The gain of graphene dipole array antenna can be achieved tunable. Then study a single microstrip patch antenna based on graphene and its array antenna to achieve a reconfigurable frequency and gain. We also study fractal patch antenna based on grapheme.We use the impedance surface of the graphene given by the theory of conductivity of grapheme to research on graphene fractal antenna. Finally we research on the graphene FSS in microwave range with using surface impedance method. It has reconfigurable absorption intensity.Chapter IV shows frequency selective surfaces with different structures (FSS) in ku-band. First we use split ring resonator (SRR) and complementary split ring resonator (CSRR) to make band-stop and band-pass frequency selective surface. And we study the effect of line-width, dielectric constant, substrate thickness and number of layers on band-width.12-15GHz passband frequency selective surfaces were designed with the structure of CSRR. Then study influence of different structural parameters on band-width and resonance point. The measured results show a good agreement with the simulation results.