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SIMULATION OF CARBON NANOTUBE THz ANTENNA ARRAYS Ying Lan, Baoqing Zeng,1 Hai Zhang, Beiran Chen, Zhonghai Yang Institute of High Energy Electronics School of Physics Electronics University of Electronic Sci & Tech of China Chengdu, 610054, P. R. China Abstrac t A novel THz antenna structure, made of carbon nanotube arrays is suggested. Using CST MICROWAVE STUDIO (CST MWS), the capabilit ies of carbon nanotube terahertz (THz) antenna arrays have been simulated. The dependence of gain, upon geometrical factors, e.g., nanotube diameter, nanotube length and the inter-tubes distance, is shown. The directivity patterns of antenna arrays and the surface current distribution of an antenna have been shown by simulation. These results could be used in the design ofcarbon nanotube THz antenna arrays. Key Words: TH z, Carbon nanotubes, Antenna.

1. Introduction THz technology is a new technology that is found in the end of 1980s. It will be applied in many domains including fundamental research, industrial application, medical application and biological application. [ 1] [2] In recent years, the research field of THz radiation has entered a completely new phase of unprecedented expansion that is generating ever-going levels of broad-based international attention. From another point of view, the characteristics of THz radiation can’t be realized completely due to lacking way of generating and detecting THz radiation. [1] [2] 1

Author to whom correspondence should be addressed, electronic mail:

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Lan et al.

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There are several antennas for THz radiation at present, e.g., bow-tie dipole antenna, [3] [ 4] [5] [6] corner reflector antenna, dielectric lens antenna , planar antenna and so on. Multi-walled carbon nanotubes’ polarization effect and length effect with visible light have been confirmed by the experiment. [ 7] This antenna effect could be used in THz and IR detectors. Like dipole antenna, the polarization effect suppresses the response of an antenna when the electric field of the incoming radiation is polarized perpendicular to the antenna axis, and the antenna length effect maximizes the antenna response when the antenna length is a multiple of half-wavelength of the radiation.

[7 ]

The gain , directivity and efficiency are the most important parameters

to scale the performance of an antenna. It has been shown that nanotube antennas are better than traditional antennas in both radiation efficiency and directivity with [ 8] the same size by Zhu et al. The fundamental transmitting properties of carbon [ 9]

nanotube antenna have been introduced by G. W. Hanson. Aligned carbon nanotube can be synthesized easily right now, using plasma enhanced hot filament chemical vapor deposition (PE-HF-CVD) method, and we can synthesize the [ 10]

carbon nanotube array with controlled diameter, length, and inter-tube distance. At the present work, we have suggested a novel THz antenna that could be made by plasma enhanced chemical vapor deposition method, and have shown the simulation results of this THz