Investigation On Carbon-nano-materials Based Resonator Andattennas

With the operating frequency of systems increases to millimeter wave and terahertzand the miniaturization degree of components also grows continuously, the losses of inelectronic device, based on traditional electromagnetic materials, become larger andlarger, and their efficiency and reliability degrade significantly. Further, the traditionaltuning methods are no more able to meet the emergent requirements on integration degreeand tuning rate. These issues have already been one of the most important bottlenecks tolimit the development of miniaturized ultra-high-speed electronic systems. How toovercome or relieve the performance limitation problems in traditional devices is a bigproblem. The study on nanomaterials provides a solid theoretical basis and criticaltechnical reserves for high-performance miniaturized electronic systems based onnew-generation electromagnetic materials.Carbon nanomaterials have excellent mechanical, thermal and electrical properties,such as the low risitivity, high thermal conductivity, high current capability, ballistictransport, controllable energy gap. When they are used in electronic device, it can bepredicted that they can provide lower power loss and higher Q-factor. And they are properto used in tunable device.In this paper, several kinds of nano-materials based components and antennas arepresent, which are designed to work in high frequency range, especially in THz range.Firstly, the basic theory of carbon-nano-electronics is given to achieve the basic modelingof carbon-nano-matrials charactoritic. Then, according to the electronic charactoritic ofcarbon nanotube, resonators based on single-walled carbon nanotube bundle andmulti-walled carobon nanotube are present. They are designed to work at THz frequencyrange, and have high Q-factors, which can be above200. It is much better than that intraditional metal resonator. Then, the voltage controllable charactoristic of nanotube is studied, in order to improve the temperature drift of the resonator. In the last section, anew beam reconfigurable antenna is proposed for THz application, which is based on aswitchable high impedance surface (HIS) using single layer graphene (SLG). The effectsof impurity density and gate voltage on the conductivity of graphene are utilized, and theswitchable reflection characteristic of the graphene-based HIS is observed. By applyingdifferent voltages for different rows of HIS units, the antenna beam can bereconfigurable.