Design of a conformal monopole antenna on a paper substrate using the properties of graphene-based conductors

Sajal, Sayeed; Braaten, Benjamin D.; Tolstedt, Travis; Asif, Sajid M.; Schroeder, Mark J.

doi:10.1002/mop.30524

Cited by 7 publications

(7 citation statements)

References 10 publications

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“…We previously reported that invisible dipole antennas fabricated using monolayer chemical vapor deposition (CVD) graphene radiate microwaves in the microwave band. 9,10 In the move toward graphene-based microwave devices, a wide variety of graphene-based devices, such as six-layer-stacked CVD graphene-based antennas, 11 CVD graphene-based transparent microwave absorbers, 12,13 printed graphene-based antennas, [14][15][16] graphene paper-based radio-frequency identification antennas, 17 multi-layer CVD graphene-based wearable antennas, 18 few layer graphene-based attenuators, 19 and on-chip Radio-frequency inductors 20 and capacitor, 21 has been reported.…”

Section: Introductionmentioning

confidence: 99%

Characterization of contact properties at interface between metal and graphene up to 15 GHz

Kosuga

Suga

Watanabe

et al. 2020

Engineering Reports

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The contact properties between metal and monolayer chemical vapor deposition (CVD) graphene were investigated. Coplanar waveguides (CPWs) composed of CVD graphene-based signal lines and Au-based ground lines were fabricated. The S-parameters of the CPWs were experimentally measured from 1 to 15 GHz. The contact properties were analyzed using a lumped component-based equivalent circuit model, which consists of the experimentally determined parallel contact resistance and the parallel contact capacitance. The calculated S-parameters of the model roughly agreed with the measured ones, which indicated that the model was suitable for analyzing the contact properties between metal and graphene up to 15 GHz. Because the impedance of the contact capacitance (4.8 × 10 −3 Ω) was four orders of magnitude lower than that of the contact resistance (50 Ω) at 15 GHz, the current flow was more capacitive and efficient than that in the DC band. The ratio of power consumption and power storage in the microwave band to the total power consumption in the DC band decreased with increasing frequency and increasing contact capacitance. Therefore, higher contact capacitance is preferable in designing microwave devices with a metal/graphene-based feeding structure, such as antennas and transmission lines.

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Section: Introductionmentioning

confidence: 99%

Characterization of contact properties at interface between metal and graphene up to 15 GHz

Kosuga

Suga

Watanabe

et al. 2020

Engineering Reports

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“…However, we are using carbon based nanomaterials such as graphene [35], because it is a low-cost material with high carrier mobility, high elasticity, to elaborate nanodevices, applied to biomedicine [36]. We are interested in elaborating, by micro-nanofabrication techniques, graphene antennas to succeed in having a wider broadband [37,38] and to be able to use graphene in wearable devices [39] or as an antenna patch [40], which would represent an improvement in the proposed device, for the real time monitoring of children and people.…”

Section: Discussionmentioning

confidence: 99%

Real Time Monitoring of Children, and Adults with Mental Disabilities Using a Low-Cost Non-Invasive Electronic Device

et al. 2017

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There are a growing number of small children—as well as adults—with mental disabilities (including elderly citizens with Alzheimer’s disease or other forms of age-related dementia) that are getting lost in rural and urban areas for various reasons. Establishing their location within the first 72 h is crucial because lost people are exposed to all kinds of adverse conditions and in the case of the elderly, this is further aggravated if prescribed medication is needed. Herein we describe a non-invasive, low-cost electronic device that operates constantly, keeping track of time, the geographical location and the identification of the subject using it. The prototype was made using commercial low-cost electronic components. This electronic device shows high connectivity in open and closed areas and identifies the geographical location of a lost subject. We freely provide the software and technical diagrams of the prototypes.

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“…To do SAR analysis, a three-dimensional anatomical hand and head phantom model is taken. The simulation of SAR is performed using finite-difference time domain (FDTD) method of computer simulation technology microwave studio (CST) [14][15][16]. The SAR values are evaluated on 1 gm bological tissue.…”

Section: On-body Placement Analysismentioning

confidence: 99%

“…A tai-chi-shaped antenna is designed with circular polarisation for dual-band applications in [14]. A conformal antenna is designed on a paper substrate with graphene as a radiating element instead of copper in [15]. Shin et al [17] proposed a meander line monopole antenna for PCS/IMT-2000/WLAN handsets with reduction in the SAR value.…”

Section: Introductionmentioning

confidence: 99%

Asymmetric Ground Structured Circularly Polarized Antenna for Ism and Wlan Band Applications

Nadh¹,

Madhav²,

Kumar³

et al. 2018

PIER M

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This article presents the design and analysis of a dual-band antenna with circular polarization for ISM and WLAN band applications. The proposed antenna operates at two frequencies ranging from 2.1-3.1 GHz and 4.4-7.7 GHz with resonating frequencies at 2.45 GHz industrial, scientific and medical band (ISM) and 5.8 GHz wireless local area network band (WLAN). The antenna is fed by coplanar waveguide feeding (CPW) with an asymmetric ground structure, and the radiating element consists of 24 spokes in the design. The current antenna providing the impedance bandwidths of 38.4% and 49% at two operating bands. The proposed antenna exhibiting circular polarisation with 3 dB axial ratio bandwidth of 150 MHz at 2.33-2.48 GHz and 1600 MHz at 5.14-6.74 GHz. The designed antenna is fabricated on an RT Duroid 5880 substrate with dimensions of 40 × 28 × 0.4 mm 3 . The intension behind the design of this antenna is to use it for wearable applications in conformal nature with low specific absorption rate (SAR). The SAR values observed at two operating frequencies are 1.09 W/Kg and 1.47 W/Kg on hand and 0.946 W/Kg and 1.12 W/Kg on head, respectively. The placement and radiation characteristics analysis is done with Ansys Savant tool, and the subsequent measured results provide good correlation with simulation results.

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Design of a conformal monopole antenna on a paper substrate using the properties of graphene-based conductors

Cited by 7 publications

References 10 publications

Characterization of contact properties at interface between metal and graphene up to 15 GHz

Characterization of contact properties at interface between metal and graphene up to 15 GHz

Real Time Monitoring of Children, and Adults with Mental Disabilities Using a Low-Cost Non-Invasive Electronic Device

Asymmetric Ground Structured Circularly Polarized Antenna for Ism and Wlan Band Applications

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