Carbon nanotube antennas analysis and applications: review

El-sherbiny, Sh.G.; Wageh, S.; Elhalafawy, Said M.; Sharshar, A.

doi:10.12989/anr.2013.1.1.013

Cited by 7 publications

(5 citation statements)

References 29 publications

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“…The other properties of carbon nanotubes that dominated the conventional antennas are anticorrosive, less weight, high input impedance, tunable conductivity, enhanced flexibility and durability, low cost, slow-wave used at resonant conditions, less thermal expansion coefficient, nonoxidizing nature, high tensile strength, immunity to environmental factors, high surface area, and ease of fabrication [17]. The types of carbon nanotube antennas manufactured so far are CNT dipole antennas, CNT thread antennas, CNT thin film antennas, CNT infinitely long antennas, optical antenna, armchair CNT antennas, bundle dipole antenna, and CNT patch antennas [18]. The carbon nanotube antennas find application in biosensors, human body communications, spying and military applications, textile industries, high-rate RF nanoreceivers, active and passive microwave nanodevices, quasioptical polarizers, wearable radio frequency antennas and sensors, etc.…”

Section: Methodsmentioning

confidence: 99%

Reduction of 1/f Noise in Single-Walled Carbon Nanotubes (SWCNTs) Using Gas Adsorption Technique

Natrayan

Angalaeswari

Kaliappan

et al. 2022

Adsorption Science & Technology

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Single-walled carbon nanotube (SWCNT) plays a major role in electromagnetic absorption and shielding. Their applications as semiconductors make a breakthrough in communication by miniaturizing the communication devices. The main drawback of the SWCNT is found to 1 / f noise. Because of this limitation, high attenuation at the low-frequency band cannot be achieved, limiting its application in terms of selectivity. The spectral density study shows that the noise’s amplitude is directly proportional to the temperature and inversely proportional to the number of carriers in the nanotube. The SWCNT is mainly synthesized using hydrocarbons which contains carbonaceous impurities. On the removal of impurities, more surface oxygen functional groups are formed. On the other hand, the diameter of the carbon nanotube is very small, increasing the resistance of carrier flow. In this research work, gas adsorption was used in SWCNT by treating the carbon nanotube using nitric acid. Isotherms determine porous size. The adsorbate-adsorbent interaction on carbon nanotube reduces the microporosity in the surface by treating with nitric acid. Therefore, the density of the surface increases and the CNT bundle separation will be reduced, increasing the carbon nanotube’s resistivity. This increase in resistivity reduces the excess carrier flow; therefore, the temperature will reduce the 1 / f noise. The proposed system is cost-effective and has shown 11% improvement by reducing the noise amplitude by increasing carbon nanotube resistance. This proposed method has less complexity compared with existing models.

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Section: Methodsmentioning

confidence: 99%

Reduction of 1/f Noise in Single-Walled Carbon Nanotubes (SWCNTs) Using Gas Adsorption Technique

Natrayan

Angalaeswari

Kaliappan

et al. 2022

Adsorption Science & Technology

View full text Add to dashboard Cite

show abstract

“…Carbon nanotubes (CNTs) have been investigated as antennas in various areascommunications between Nanodevices and macroscopic world, nano interconnect, fiber communication, aircraft and space communication systems. Researchers assumed that CNTs antennas technology will be at the frontier of scientific research for the next decades, especially in wireless communication technology with nanometer length of CNTs dipole antenna, the electromagnetic (EM) radiation from this antenna is expected to cover a range within terahertz (THz) and optical frequency [1] [2].…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, a virtual CNTs model is developed to be used with commercial software packages to deduce the performance of various CNTs antenna configurations. There are several methods for the investigation of the properties of the CNTs antenna [1].…”

Section: Introductionmentioning

confidence: 99%

“…The trails of having a dipole antenna with the efficiency higher than the copper one have been made by researchers in recent years [1]. Copper dipole antenna does not offer reliable efficiency when it transmits or detects terahertz frequency signal because of skin effect.…”

Section: Introductionmentioning

confidence: 99%

“…However, the previous study has shown that the radiation efficiency of a single-walled carbon nanotube (SWCNT) antenna is very low, which is mainly attributed to the strong retarded surface wave that reduces the radiation resistance. On the other hand, the problem of impedance mismatch is significant if a single CNT is used to build an antenna because its characteristic impedance (10 -100 kΩ) is extremely large compared to the normal feeding line (50 Ω) [1]. Because of this, the idea of coating SWCNT has been studied to have dipole antenna works on the high frequency with probable efficiency [9].…”

Section: Introductionmentioning

confidence: 99%

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