An ultra-wideband pattern reconfigurable antenna based on graphene coating |
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| Affiliation: | 1.Guangxi Key Laboratory of Wireless Wideband Communication and Signal Processing, Guilin 541004, China;2.Key Laboratory of Cognitive Radio and Information Processing(Ministry of Education), Guilin University of Electronic Technology, Guilin 541004, China;3.Guangxi Experiment Center of Information Science, Guilin University of Electronic Technology, Guilin 541004, China |
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| Abstract: | An ultra-wideband pattern reconfigurable antenna is proposed. The antenna is a dielectric coaxial hollow monopole with a cylindrical graphene-based impedance surface coating. It consists of a graphene sheet coated onto the inner surface of a cylindrical substrate and a set of independent polysilicon DC gating pads mounted on the outside of the cylindrical substrate. By changing the DC bias voltages to the different gating pads, the surface impedance of the graphene coating can be freely controlled. Due to the tunability of graphene's surface impedance, the radiation pattern of the proposed antenna can be reconfigured. A transmission line method is used to illustrate the physical mechanism of the proposed antenna. The results show that the proposed antenna can reconfigure its radiation pattern in the omnidirectional mode with the relative bandwidth of 58.5% and the directional mode over the entire azimuth plane with the relative bandwidth of 67%. |
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| Keywords: | ultra-wideband pattern reconfigurable antenna graphene impedance surface |
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