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Analysis of slow‐wave propagation in coplanar transmission lines with inkjet printed multiwalled carbon nanotubes network
Author(s) -
Oueriemi Ibtissem,
Raskin JeanPierre,
Neve CésarRoda,
Choubani Fethi,
Dupont Védi,
Lardot Véronique,
Huynen Isabelle
Publication year - 2014
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.28280
Subject(s) - coplanar waveguide , capacitance , attenuation , materials science , carbon nanotube , microwave , equivalent circuit , transmission line , propagation constant , optoelectronics , electrical engineering , nanotechnology , voltage , optics , physics , telecommunications , engineering , electrode , quantum mechanics
This article investigates the propagation along coplanar waveguide (CPW) structures, where multiwalled carbon nanotubes (MWCNTs) network layers are deposited using inkjet printing. Electrical parameters are extracted from measured S‐parameters data over the frequency range from 10 MHz to 26.5 GHz. The results clearly demonstrate two distinct propagation modes. At low‐frequencies, a slow‐wave factor up to 7 is achieved. With increasing frequency, attenuation becomes significant, while the propagation constant tends to a linear TEM regime. An equivalent lumped element circuit for CPW structure with MWCNTs network is developed and describes well the measured behavior up to 26.5 GHz. Thanks to the extracted equivalent circuit, the origin of the observed slow‐wave phenomenon is confirmed: it is ascribed to a larger capacitance per unit length of the CPW line induced by the presence of the CNTs network that prevents/limits the expansion of fields into air. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:1118–1124, 2014