A Planar Antenna With Voltage-Controlled Frequency Tuning Based on Few-Layer Graphene

Yasir, Muhammad; Savi, Patrizia; Bistarelli, Silvia; Cataldo, Antonino; Bozzi, Maurizio; Perregrini, Luca; Bellucci, Stefano

doi:10.1109/lawp.2017.2718668

Cited by 77 publications

(43 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…For instance, it has been already reported [37,38] that the wrinkling of graphene nanoplatelets (see Figure 3) and their surface treatment (i.e., with linoleic acid) can lower the dielectric permittivity of graphene. Furthermore, a high enough wt.% (over the percolation threshold) of graphene nanoplatelets distributed inside the polymeric medium can function as nanoscale electrostatic capacitors [39][40][41][42]. Therefore, the dielectric permittivity lowering (with respect to the gap dielectric that is the FR-4 and MWCNTs) can produce a reduction of the antenna capacitance, reflecting into an impedance increase and in turn causing the resonant frequency to shift to higher frequency.…”

Section: Resultsmentioning

confidence: 99%

Graphene and MWCNT Printed Films: Preparation and RF Electrical Properties Study

Quaranta

Giorcelli

Savi

2019

Journal of Nanomaterials

Self Cite

View full text Add to dashboard Cite

Carbon materials are well known for being a versatile class of materials able to transmit an electrical signal when used as fillers in composites. Among numerous carbon fillers, carbon nanotubes and graphene have been extensively investigated for the last thirty years. This paper compares graphene and carbon nanotube electrical (i.e., resistive and reactive) properties in the microwave range up to 3 GHz. The transmission and reflection parameters of both the microstrip transmission lines and patch antennas loaded with 33 wt.% of graphene and multiwalled carbon nanotubes (MWCNTs) were analyzed. Interestingly, for an identical composite matrix composition, different scattering parameters stemmed from the different morphology of the films, the diverse interactions between the graphene nanoplatelets, MWCNTs, and polymeric binders in conjunction with the intrinsic electrical characteristics of the two carbon materials.

show abstract

Section: Resultsmentioning

confidence: 99%

Graphene and MWCNT Printed Films: Preparation and RF Electrical Properties Study

Quaranta

Giorcelli

Savi

2019

Journal of Nanomaterials

Self Cite

View full text Add to dashboard Cite

show abstract

“…Previous research of the graphene shows that the conductivity of the graphene is changed with frequencies in microwave range. However, this variation was not significantly changed at the same graphene bias.…”

Section: Antenna Design and Resultsmentioning

confidence: 99%

“…Graphene has a sheet conductivity of about 10 Ω/square in the case of high voltage bias and about 1000 Ω/square in the case of zero voltage . The equivalent circuit of the graphene pad has been presented as a series impedance R g and inductor L g , and the values of graphene impedance vary according to applied bias voltage . Graphene oxide (GO) has a received much attention as a result of its low cost, simple/various preparation techniques with the ability to be easily transformed to commercial graphene as reduced graphene oxide (RGO).…”

Section: Introductionmentioning

confidence: 99%

Reconfigurable frequency and steerable beam of monopole antenna based on graphene pads

Elsheakh

2020

Int J RF Microw Comput Aided Eng

View full text Add to dashboard Cite

This article presents a reconfigurable frequency and steerable beam monopole antenna based on tunable graphene pads operating in both 4G and 5G bands. The proposed antenna consists of printed CPW‐fed circular monopole shapes, with five rectangular strips added with a separation angle of 45°. These strips are connected to monopole by using graphene pads. The monopole antenna operates in the lower 5G band from 3 up to 7.8 GHz at −6 dB reflection coefficient. The antenna has an omni‐radiation pattern over the operating band without any applied bias voltage to the graphene pads. By applying the DC bias voltage, the rectangular strips are connected to the monopole and the designed antenna start to resonate from 1.8 to 8 GHz adding the 4G band frequencies. The steering of the proposed antenna beam started from −60° to 60° according to the bias of the connected graphene pads. The graphene pad exhibits a variable resistance realizing an almost short to an open circuit with and without voltage bias, respectively. The designed antenna is simulated using high frequency structure simulation (HFSS) Ansys ver. 19 and equivalent circuit model of the graphene. The antenna is fabricated using reduced graphene oxide (RGO) pads. Reflection coefficient and radiation pattern measurements as well as simulations are presented with a positive agreement between the results.

show abstract

“…Yasir and coworkers experimentally demonstrated the tuning of frequency using multi-layer graphene in a nanoantenna [145]. The geometry of the antenna consisted of a rectangular radiating antenna along with a stub.…”

Section: Tunable Hybrid Graphene-metal Plasmonic Nanoantennas and Thementioning

confidence: 99%

A Review on the Development of Tunable Graphene Nanoantennas for Terahertz Optoelectronic and Plasmonic Applications

Ullah

Witjaksono

Nawi

et al. 2020

Sensors

View full text Add to dashboard Cite

Exceptional advancement has been made in the development of graphene optical nanoantennas. They are incorporated with optoelectronic devices for plasmonics application and have been an active research area across the globe. The interest in graphene plasmonic devices is driven by the different applications they have empowered, such as ultrafast nanodevices, photodetection, energy harvesting, biosensing, biomedical imaging and high-speed terahertz communications. In this article, the aim is to provide a detailed review of the essential explanation behind graphene nanoantennas experimental proofs for the developments of graphene-based plasmonics antennas, achieving enhanced light–matter interaction by exploiting graphene material conductivity and optical properties. First, the fundamental graphene nanoantennas and their tunable resonant behavior over THz frequencies are summarized. Furthermore, incorporating graphene–metal hybrid antennas with optoelectronic devices can prompt the acknowledgment of multi-platforms for photonics. More interestingly, various technical methods are critically studied for frequency tuning and active modulation of optical characteristics, through in situ modulations by applying an external electric field. Second, the various methods for radiation beam scanning and beam reconfigurability are discussed through reflectarray and leaky-wave graphene antennas. In particular, numerous graphene antenna photodetectors and graphene rectennas for energy harvesting are studied by giving a critical evaluation of antenna performances, enhanced photodetection, energy conversion efficiency and the significant problems that remain to be addressed. Finally, the potential developments in the synthesis of graphene material and technological methods involved in the fabrication of graphene–metal nanoantennas are discussed.

show abstract

A Planar Antenna With Voltage-Controlled Frequency Tuning Based on Few-Layer Graphene

Cited by 77 publications

References 11 publications

Graphene and MWCNT Printed Films: Preparation and RF Electrical Properties Study

Graphene and MWCNT Printed Films: Preparation and RF Electrical Properties Study

Reconfigurable frequency and steerable beam of monopole antenna based on graphene pads

A Review on the Development of Tunable Graphene Nanoantennas for Terahertz Optoelectronic and Plasmonic Applications

Contact Info

Product

Resources

About