Characterization of the radiation from single-walled zig-zag carbon nanotubes at terahertz range |
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Authors: | Wu Qun Wang Yue Wu Yu-Ming Zhuang Lei-Lei Li Le-Wei and Gui Tai-Long |
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Institution: | School of Electronics and Information Technology, Harbin Institute of Technology, Harbin 150001, China; Department of Electronic Science and Technology, Harbin University of Science and Technology, Harbin 150080, China; Department of Electrical and Computer Engineering, National University of Singapore, 10 Kent Ridge Crescent, 119260, Singapore; State Key Laboratory of Millimeter Wave, Southeast University, Nanjing 211189, China |
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Abstract: | This paper investigates the radiation characteristics of
metal single-walled zig-zag carbon nanotubes as a dipole antenna at
terahertz wave range. The current distribution, input impedance and
mutual impedance are calculated for various geometrical parameters
of vertically-aligned carbon nanotubes. The numerical results
demonstrate the properties of the antenna depending strongly on the
geometrical parameters such as the radius, the lengths of carbon
nantobues, and the spacing between nanotubes. It is found that the
zig-zag carbon nanotubes exhibit very high input impedance and the
mutual impedances for antenna array applications. These unique high
impedance properties are different from the conventional metal thin
wire antenna. The far-field patterns and gain of antenna array are
also calculated. The maximum gain of array of 100-element array is
up to 20.0~dB, which is larger than the gain of 0.598~dB of single
dipole antenna at distance $d = 0.5\lambda $. |
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Keywords: | zig-zag carbon nanotube dipole antenna terahertz impedance |
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