Performance Assessment of Bundled Carbon Nanotube for Antenna Applications at Terahertz Frequencies and Higher

Choi, Sangjo; Sarabandi, Kamal

doi:10.1109/tap.2010.2103023

Cited by 34 publications

(12 citation statements)

References 14 publications

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“…It has also been predicted through simulations that a dipole antenna constructed from a CNT bundle structure may exhibit radiation efficiency orders of magnitude higher than that of an individual CNT [11]- [13] and that this radiation efficiency increases as the nanotube density within the bundle is increased [14]. Emerging fabrication techniques have made realizable the synthesis of large-scale CNT bundle structures such as threads, ribbons, and sheets.…”

mentioning

confidence: 99%

Electromagnetic Simulation and Measurement of Carbon Nanotube Thread Dipole Antennas

Keller

Zaghloul

Shanov

et al. 2014

IEEE Trans. Nanotechnology

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The conductivity, current distribution, and radiation efficiency for a variety of dipole antennas constructed from carbon nanotube thread/rope are simulated using Hallén's integral equation for a thin wire applied to the method of moments and are compared to a standard copper wire dipole antenna. Next, the conductivity and weight of fully fabricated carbon nanotube thread and rope samples are measured and analyzed. Finally, half-wavelength copper and carbon nanotube (CNT) thread dipole antenna prototypes are fabricated, measured, and analyzed. Simulation results indicate that the CNT thread/rope antenna performance improves with increased diameter and that the application of these materials as a half wavelength dipole antenna yields manageable losses of less than 1-5 dB at RF frequencies above 10 GHz. Measured sample results demonstrate that the existing single-ply CNT thread exhibits a conductivity approximately 2-3 orders of magnitude lower than copper. The braiding method employed to produce large diameter CNT rope was demonstrated to be a poor method for increasing thread diameter and conductivity due to the additional resistive losses that the braiding geometry introduced. Dimethyl sulfoxide densification was found to be a valuable method for improving CNT thread conductivity and lowering the thread contact resistance. Dipole antenna prototype measurements confirm the functionality of the CNT thread as an antenna, albeit with a 4% downward frequency shift due to reactance effects and material losses of greater than 12 dB at 2.45 GHz as predicted by the results from the method of moments simulations.Index Terms-Carbon nanotube (CNT), dimethyl sufoxide, dipole antenna, Hallen's integral equation, method of moments.

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confidence: 99%

Electromagnetic Simulation and Measurement of Carbon Nanotube Thread Dipole Antennas

Keller

Zaghloul

Shanov

et al. 2014

IEEE Trans. Nanotechnology

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“…While the application of an individual single-wall nanotube (SWNT) as an antenna has been analytically shown to yield very low radiation efficiency at microwave frequencies (1,2), it has recently been shown through analysis (3,4) and measurement (5) that the dominant kinetic inductance and resistance of a CNT can be significantly reduced by fabricating a large number of CNTs into a bundle structure. It has also been predicted through simulations that dipole antennas constructed from CNT bundle structures may exhibit radiation efficiency orders of magnitude higher than that of individual CNTs (6) and that this radiation efficiency increases as the nanotube density with the bundle is increased (7). Emerging fabrication techniques have made realizable the synthesis of large-scale CNT bundle structures such as threads, ribbons, and sheets (8).…”

Section: Objectivementioning

confidence: 99%

Lightweight, Durable Army Antennas Using Carbon Nanotube Technology

Keller¹,

Zaghloul²

2013

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Sensors and Electron Devices Directorate, ARLApproved for public release; distribution unlimited. ii REPORT DOCUMENTATION PAGE Form Approved OMB No. 0704-0188Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number.

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“…While it has been analytically shown that an individual single-wall nanotube (SWNT) antenna yields very low radiation efficiency at microwave frequencies [1], [2] due to dominant kinetic inductance and input resistance, further analysis [3], [4] and measurement [5] have indicated that these hindrances may be significantly reduced when the CNTs are arranged into a bundle structure. CNT bundle structures may also exhibit radiation efficiency orders of magnitude higher than that of individual CNTs [6] and exhibit improved efficiency as the nanotube density within the bundle is increased [7]. The electrical properties of CNTs have been applied to antenna designs by using the individual CNTs as conductors in an array format and also by harvesting individual CNTs and mixing them into a liquid to form a conductive solution or composite material.…”

Section: Introductionmentioning

confidence: 99%

Design Considerations for a Meshed Carbon Nanotube Thread Patch Antenna

Keller

Zaghloul

Shanov

et al. 2013

Antennas Wirel. Propag. Lett.

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A meshed carbon nanotube thread patch antenna is proposed and analyzed through full-wave electromagnetic simulation. The effects of thread spacing and of fabricating the feedline and ground-plane layers from meshed thread are explored. Results indicate that minimal impact on antenna radiation efficiency and usable bandwidth is achieved with a thread spacing of . A minor center frequency shift and reduction in realized gain and bandwidth occurs when the thread spacing is increased. When the feedline and/or ground plane is constructed from meshed carbon nanotube thread material, the realized gain is significantly reduced. Improvements to carbon nanotube thread conductivity should mitigate this reduction in realized gain.Index Terms-Carbon nanotube, meshed antenna, patch antenna.

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Performance Assessment of Bundled Carbon Nanotube for Antenna Applications at Terahertz Frequencies and Higher

Cited by 34 publications

References 14 publications

Electromagnetic Simulation and Measurement of Carbon Nanotube Thread Dipole Antennas

Electromagnetic Simulation and Measurement of Carbon Nanotube Thread Dipole Antennas

Lightweight, Durable Army Antennas Using Carbon Nanotube Technology

Design Considerations for a Meshed Carbon Nanotube Thread Patch Antenna

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