Design Of Reconfigurable Antenna Based On Graphene

With the mature development of science and technology,the market’s requirements for communication continue to increase.In order to cope with the complex and changeable communication environment,the number of antennas in the communication system is also increasing.Facing more and more complex communication systems and wireless applications.Reconfigurable antennas can realize single-parameter or multi-parameter reconstruction in terms of frequency,pattern,polarization,etc.so that a single antenna has the function of multiple antennas,thereby reducing the number of antennas,making it the hotspot of antenna design neighborhood.As a new type of two-dimensional carbon nanomaterial,graphene is composed of carbon atoms arranged in the form of regular hexagons in the same plane,and the thickness is only a single atom thickness.Its unique structure and properties have been enthusiastically discussed by researchers in many fields.In the field of microwave technology,the characteristic that the surface conductivity of graphene can be changed with an external bias voltage has a wide range of applications in tunable antennas and passive devices.It solves the problem that high-frequency band tuning devices are difficult to apply,and provides a new idea for the design of reconfigurable antennas.For this reason,this article combines graphene to study polarization reconfigurable and hybrid reconfigurable antennas.The main research contents are as follows:1.Introduced the status of reconfigurable antennas,explored preparation method of graphene and the control method of conductivity,which lays the foundation for applications in the reconfigurable antenna.2.A dual-band(1.3-1.33 THz,1.46-1.54THz)independently controllable active polarization converter metasurface(APCM)is designed.The APCM unit includes slots on the two diagonals and the graphene.By changing the bias device,the graphene chemical potential can be changed between 0e V and 0.5e V,so that the APCM can manipulate the incident electromagnetic wave in dual bands,and realize the switching between the polarization conversion and the polarization maintenance of the reflected wave.3.A dual-band polarization reconfigurable terahertz antenna is proposed by incorporating a monopole antenna with APCM.By adjusting the state of APCM polarization conversion/holding,the antenna has two operating bands and four operating modes including dual linear polarization and dual circular polarization.4.A linear polarization reconfigurable antenna based on graphene is proposed.The antenna consists of a T-shaped power split and a circular patch.Each branch feeder is connected to an open path through graphene.By adjusting the square resistance of the graphene,the working port can be selected.When the graphene sheet resistance of 20Ω / sq,the branch is disconnected means port does not work;when the graphene sheet resistance of 200Ω/sq,the branch is connected and the port works.By choosing ports to work,the two polarization modes that horizontal polarization and vertical polarization can be choose.5.A graphene-based hybrid reconfigurable antenna with polarization and frequency is proposed.The antenna uses a power split feed structure to achieve a circular polarization design of orthogonal double feed.Each branch feeder is connected to an open path through graphene.The left and right branches of the T-type power divider are all connected to the open path through graphene.Adjusting the square resistance of graphene can select the working port.When two ports work at the same time,the antenna works in dual-frequency circular polarization mode;when single port works alone,the electromagnetic waves radiated by the antenna are vertical polarization and horizontal polarization respectively.and when the single port is working,the antenna has different working frequency bands.6.A graphene-based hybrid reconfigurable antenna with polarization and pattern is designed.The antenna uses the polarization reconfigurable antenna proposed in Research Content 4 as a unit to form a binary array.The antenna consists of two circular radiating patches and a one-to-four feed structure.Each branch feeder is connected to an open line through graphene.Adjust the square resistance of graphene to control the on and off of each branch.The antenna can realize linear polarization reconfigurable,circular polarization reconfigurable and pattern reconfigurable.