A tunable microwave slot antenna based on graphene

Dragoman, Mircea; Neculoiu, D.; Bunea, Alina-Cristina; Deligeorgis, G.; Aldrigo, Martino; Vasilache, D.; Dinescu, Adrian; Konstantinidis, George; Mencarelli, Davide; Pierantoni, Luca; Modreanu, M.

doi:10.1063/1.4917564

Cited by 75 publications

(46 citation statements)

References 21 publications

(23 reference statements)

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“…In the literature, similar problems have been overcome, e.g. in graphene antenna applications, by thinning the HRSi layer and properly shaping the back metallization [22,23]: this allowed for vertically bias without preventing antenna matching and radiation.…”

Section: Test-devicementioning

confidence: 99%

THz plasmonic resonances in hybrid reduced-graphene-oxide and graphene patterns for sensing applications

Mencarelli¹,

Nishina²,

Ishikawa³

et al. 2017

Optical Data Processing and Storage

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Abstract:In this contribution, we e ectively combine important developments of nowadays technology: graphene based THz plasmonics, reduced-graphene-oxide (rGO) based sensors, and capability of patterning graphene materials at micro and nano scale. Surface waves in graphene were observed for the rst time only few years ago, con rming the ability of this exceptional material to support plasmons at relatively low frequencies -a few THz -due to its intrinsically huge selfinductance. On the other hand, graphene oxide, and its reduced forms, has emerged as a very interesting material for several applications, including gas sensors and biosensors. In this work, the possibility of a ne and controlled patterning of the above materials is considered as a useful degree of freedom to govern plasmon resonances and consequent electromagnetic absorption. In particular, the excitation of THz plasmons in arrays of nanoribbons, made of graphene and rGO, has been deeply investigated, in order to quantify the sensitivity to surface changes of conductivity, due to possible external perturbations. Fullwave analysis of hybrid metal-graphene-rGO is also presented and discussed. The e ects of substrate thickness and of higher di raction modes are rigorously taken into account, as a possible mean to enhance the sensing capability of the proposed device.

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Section: Test-devicementioning

confidence: 99%

THz plasmonic resonances in hybrid reduced-graphene-oxide and graphene patterns for sensing applications

Mencarelli¹,

Nishina²,

Ishikawa³

et al. 2017

Optical Data Processing and Storage

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“…Owing to its outstanding properties, graphene is used in RF nanoelectronics [7]- [9] to realize novel high-speed devices such as FETs [10], frequency multipliers [11], transparent solar cells [12], meta-materials [13], and graphene plasmonics [14]. Nevertheless, the graphene application in passively guided devices and antennas from microwaves (MWs) to terahertz has started only recently [15], [16]. This is mainly because such structures require electric sizes in the order of the electromagnetic wavelength, while the size of the first available graphene samples was much smaller.…”

mentioning

confidence: 99%

Broadband Microwave Attenuator Based on Few Layer Graphene Flakes

Pierantoni

Mencarelli

Bozzi

et al. 2015

IEEE Trans. Microwave Theory Techn.

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120

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This paper presents the design and fabrication of a broadband microstrip attenuator, operating at 1-20 GHz, based on few layer graphene flakes. The RF performance of the attenuator has been analyzed in depth. In particular, the use of graphene as a variable resistor is discussed and experimentally characterized at microwave frequencies. The structure of the graphene-based attenuator integrates a micrometric layer of graphene flakes deposited on an air gap in a microstrip line. As highlighted in the experiments, the graphene film can range from being a discrete conductor to a highly resistive material, depending on the externally applied voltage. As experimental evidence, it is verified that the application of a proper voltage through two bias tees changes the surface resistivity of graphene, and induces a significant change of insertion loss of the microstrip attenuator.

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“…Fortunately, graphene can be introduced as the "switch" for terahertz-frequency devices because of its active complex conductivity. Some antennas take advantage of the graphene by making the frequency or the radiation pattern reconfigurable [17][18][19][20][21][22][23] such as the MIMO antennas, 17 leaky-wave antennas, 18,19 Yagi antennas, 20 microstrip quasi-Yagi antennas, 21 reflect-array antennas, 22 slot antennas, 23 and dipole antennas. 24,25 The antennas proposed in Refs.…”

Section: Introductionmentioning

confidence: 99%

Graphene-based Yagi-Uda antenna with reconfigurable radiation patterns

Jiao

et al. 2016

AIP Advances

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This paper presents a radiation pattern reconfigurable Yagi-Uda antenna based on graphene operating at terahertz frequencies. The antenna can be reconfigured to change the main beam pattern into two or four different radiation directions. The proposed antenna consists of a driven dipole radiation conductor, parasitic strips and embedded graphene. The hybrid graphene-metal implementation enables the antenna to have dynamic surface conductivity, which can be tuned by changing the chemical potentials. Therefore, the main beam direction, the resonance frequency, and the front-to-back ratio of the proposed antenna can be controlled by tuning the chemical potentials of the graphene embedded in different positions. The proposed two-beam reconfigurable Yagi-Uda antenna can achieve excellent unidirectional symmetrical radiation pattern with the front-to-back ratio of 11.9 dB and the10-dB impedance bandwidth of 15%. The different radiation directivity of the two-beam reconfigurable antenna can be achieved by controlling the chemical potentials of the graphene embedded in the parasitic stubs. The achievable peak gain of the proposed two-beam reconfigurable antenna is about 7.8 dB. Furthermore, we propose a four-beam reconfigurable Yagi-Uda antenna, which has stable reflection-coefficient performance although four main beams in reconfigurable cases point to four totally different directions. The corresponding peak gain, front-to-back ratio, and 10-dB impedance bandwidth of the four-beam reconfigurable antenna are about 6.4 dB, 12 dB, and 10%, respectively. Therefore, this novel design method of reconfigurable antennas is extremely promising for beam-scanning in terahertz and mid-infrared plasmonic devices and systems.

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A tunable microwave slot antenna based on graphene

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Cited by 75 publications

References 21 publications

THz plasmonic resonances in hybrid reduced-graphene-oxide and graphene patterns for sensing applications

THz plasmonic resonances in hybrid reduced-graphene-oxide and graphene patterns for sensing applications

Broadband Microwave Attenuator Based on Few Layer Graphene Flakes

Graphene-based Yagi-Uda antenna with reconfigurable radiation patterns

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