Metallic nanowire filled membrane for slow wave microstrip transmission lines

Franc, Anne-Laure; Podevin, Florence; Cagnon, Laurent; Ferrari, Philippe; Serrano, Ariana L. C.; Rehder, Gustavo P.

doi:10.1109/iscdg.2012.6360022

Cited by 7 publications

(6 citation statements)

References 5 publications

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“…By implementing NaM in microstrip topology, the electric field of the RF signal is mostly captured by the nanowires on the top surface of the NaM and barely penetrates into it. In contrast, the magnetic field is almost unperturbed due to the extremely thin diameter of the nanowires [28], compare Fig. 2.…”

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confidence: 96%

“…However, these technologies suffer from high complexity, sometimes high cost, limited bandwidth and relatively high IL. Recently, SW TLs based on NaM have provided a novel approach, with high performance, low cost and easy fabrication [26]- [28]. NaM is fabricated based on a commercial porous alumina membrane.…”

mentioning

confidence: 99%

“…4(a). The NaM fabrication procedure is described in detail in [26]- [28]. By implementing NaM in microstrip topology, the electric field of the RF signal is mostly captured by the nanowires on the top surface of the NaM and barely penetrates into it.…”

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confidence: 99%

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Fast and Miniaturized Phase Shifter With Excellent Figure of Merit Based on Liquid Crystal and Nanowire-Filled Membrane Technologies

et al. 2022

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This paper presents a highly miniaturized tuneable microstrip line phase shifter for 5 GHz to 67 GHz. The design takes advantage of the microstrip topology by substituting the ground plane by a metallic-nanowire-filled porous alumina membrane (NaM). This leads to a slow-wave (SW) effect of the transmission line; thus, the transmission line can be physically compact while maintaining its electric length. By applying a liquid crystal (LC) with its anisotropic permittivity as substrate between the transmission line and the NaM, a tuneable microstrip line phase shifter is realized. Three demonstrators are identically fabricated filled with different types of high-performance microwave LCs from three generations (GT3-23001, GT5-26001 and GT7-29001). The measurement results show good matching in a 50 system with reflection less than −10 dB over a wide frequency range. These demonstrators are able to reach a maximum figure of merit (FoM) of 41 • /dB, 48 • /dB, and 70 • /dB for different LCs (GT3-23001, GT5-26001 and GT7-29001, respectively). In addition, experiments show that all three LCs should be biased with square wave voltage at approximately 1 kHz to achieve maximum tuneability and response speed. The achieved response times with GT3-23001, GT5-26001 and GT7-29001 are 116 ms, 613 ms, and 125 ms, respectively, which are much faster than other reported LC phase shifter implementations. Large-signal analysis shows that these implementations have high linearity with third-order interception (IP3) points of approximately 60 dBm and a power handling capability of 25 dBm.

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confidence: 96%

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confidence: 99%

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Fast and Miniaturized Phase Shifter With Excellent Figure of Merit Based on Liquid Crystal and Nanowire-Filled Membrane Technologies

et al. 2022

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“…The wave propagating in the substrate of a µTL is mostly TEM, which means it is possible to use the same principle as for the slow-wave waveguides to generate slow-wave propagation in a µTL with the use of VA-CNT forests below the line Figure 4-11. This idea is also supported by the work done in [10], where simulations of a µTL with a propagation layer made of an alumina membrane filled with copper nano-wires was run.…”

Section: Slow-wave µTlmentioning

confidence: 82%

“…[8] shows results from a SU-8 photo-resist bottom up fabricated SIW air cavities. Other topologies for waveguiding were studied: Ferromagnetic slow-wave micro-strip [9], metallic nanowires for slow-wave micro-strip [10]. These last two are focusing on slow-wave propagation in micro-strip transmission lines in the beginning of the millimetre band.…”

Section: State Of the Artmentioning

confidence: 99%

Use of carbon nanotubes for passive radio-frequency devices

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As devices get more connected and communication increase in density, new challenges arise. The usual frequency bands used are getting crowded by the number of applications, and the relatively low working frequencies limit the available bandwidth and speed. Applications are now implemented in the GHz, but next generation devices shift towards higher frequencies into the millimetre band (30-300 GHz), seeking larger bandwidths, smaller devices and antenna size and improvement in spatial resolution. (High bitrate communications, Backhaul, radars, imaging, bio-sensors…) These emerging devices have a need for passive framework for feeding and supporting while keeping the efficiency high, the dimensions short and the bandwidth large. The problematic of this thesis is to devise an innovative way to answer those needs. Some solutions have of course emerged in the literature, and the plan here is to fork from those pre-existing results. Most solutions revolve around using vertically aligned micro/nano-structures to guide a wave or to reduce wave velocity. The idea is to introduce Vertically-Aligned Carbon Nanotube Forests (VA-CNT) into those designs, for they display inherently conductive anisotropy while improving from the previous solutions in terms of density and equivalent conductivity and ease of fabrication.

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