Performance evaluation of the electromagnetic behavior of the bundle SWCNTs with circular geometry

This paper presented for the purpose of study and estimates the fundamental electromagnetic properties of the bundle of single-walled carbon nanotubes with circular geometrical structure. The bundle of single-walled carbon nanotubes (SWCNTs) dipole antenna will be employed for this purpose by using Drude method at THz frequency range. The armchair-single-walled carbon nanotube (armchair- SWCNTs) will be utilized in this work, Due to their metallic conducting properties, in order to configure the bundle of SWCNTs. The bundle that will be investigated in the current work is filled by identical SWCNTs having the same radius and same length. The radiation pattern, s11 parameters and antenna directivity of bundle SWCNTs dipole antenna are presented in this paper. Based on the performance evaluation presented in this paper, the bundle of SWCNT dipole antenna is a good candidate for the nano-antenna application instead of SWCNT dipole antenna. Also, the problem that associated with SWCNT dipole antenna can be reduced by the bundle. All results in this work explained that the bundle of SWCNTs can be used to design bundle of SWCNTs dipole antenna in a wide THz frequency band. The performance of this dipole antenna will be evaluated by using Computer Simulation Technology (Microwave studio) CST (MWS), which presents and analyses the key parameters of the antenna.

I. Introduction

Since carbon nanotubes (CNTs) were exploited by Iijima [1], several of application areas at terahertz (THz) frequency band was presented. The rare properties of CNTs made it a good candidate material for different applications. The main structure of CNTs is a graphene sheets Wrapped up to configure a cylinders with nanometer radius scale dimension and up to several centimeters in length. Based on their tubular structure the CNTs can be considered as a metallic or semiconducting material [2]. The number of tubes that constructs the CNTs was adopted to classify the CNTs into single-walled carbon nanotubes (SWCNTs) and multi-walled carbon nanotubes (MWCNTs) [3]–[4]. The SWCNTs consist of one cylinder, while the MWCNTs consist of several numbers of concentric cylinders. In the previous research the SWCNT was classified, based on the angle of wrapping the original graphene sheet. These kinds of SWCNTs are metallic and semi-metallic. The metallic SWCNTs characterized by supporting ballistic condition and have free-path of the order of a micron in length [2, 5–9].