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F. Camera, C. Miozzi, F. Amato, C.
Occhiuzzi, and G. Marrocco, IEEE Sensors Letters, vol. 4, no. 11, pp.
1-4, Nov. 2020, Art no. 6002304, doi:
10.1109/LSENS.2020.3036486.
Wireless
epidermal devices (WED), based on UHF
Radio frequency Identification (RFID),
enable a contactless and
non-invasive human body monitoring through
sampling of health parameters directly on
the skin. With reference to body
temperature, this letter reports an
experimental campaign aimed at assessing
the degree of agreement of a batteryless plaster-like
WED, placed in the armpit region, with a
standard axilla thermocouple thermometer.
A measurement campaign over
10 volunteers, for overall 120 temperature
outcomes, revealed a good correlation
among the instruments (Person’s
coefficient p=0.78) and a difference of
less than 0.6°C in the 95% of the measured
cases, provided that a
user-calibration is applied. RFID-WED
enables a non-contacting reading up to 20
cm and a direct connectivity with a cloud
architecture. Envisaged applications are
the periodic monitoring in clinical and
domestic scenarios, as well as the screening of
restricted communities related to Covid-19
control and recovery.
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C. Occhiuzzi, S. Parrella, F.
Camera, S. Nappi, and G. Marrocco, IEEE Sensors, vol. 21, no. 4, pp. 5359-5367,
15 Feb.15, 2021, doi:
10.1109/JSEN.2020.3031664.
Wireless epidermal devices based
on Radio frequency Identification (RFID)
enable a contactless and noninvasive
monitoring of the human body by sampling
health parameters directly on the skin. To
achieve multi-parametric sensing, while
preserving the intrinsic simplicity and the
low cost of RFID tags, a dual-chip epidermal
device is here proposed. At this purpose a
polarization-diversity loop antenna is
exploited so that two almost independent
current modes are excited. The resulting
radiation patterns are both broadside, thus
enabling the simultaneous gathering of two
independent dataset from the same maximum
distance. A 3.5 by 3.5 cm battery-less,
flexible and soft prototype provides -13 dBi
embedded realized gain with read distances
ranging from 0.6m to 1.5m depending on the
microchip sensitivity. The electromagnetic
performance of the two ports remain similar
even when the tag is applied onto rather
in-homogeneous body regions. With reference to
body temperature monitoring, the device has
been experimented in both controlled and
real-life environments, demonstrating the
possibility of doubling the sensing
capabilities of RFID epidermal devices without
affecting their size and radiation
performances.
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J. Hughes, C. Occhiuzzi, J.
Batchelor, and G. Marrocco, IEEE Antenna and Wireless
Propagation Letters, vol. 19, no. 12, pp.
2092-2096, Dec. 2020, doi:
10.1109/LAWP.2020.3023291.
Emerging 5G infrastructures can
boost innovative paradigms for future wearable
and epidermal devices exploiting low-power
(even passive) wireless backscattering-based
communication.Tocompensatehighbody-andpath-losses,andtoextend
the read range, array configurations are
required. This work proposes a flexible
monolithic epidermal layout, based on Krauss
array concept, that operates at 3.6 GHz and it
is suitable to be directly attached to the
human body. The antenna involves a dual grid
configuration with a main radiating grid backed
by a grid reflector placed in touch with the
skin. Overall, the amount of conductor an
dielectric substrate are minimized with
benefittobreathability.Theantennaissuitabletosurfacefeeding
and produces a broadside radiation. Parametric
analysis are performed and an optimal
configuration of four-cells grid is derived and
experimentally demonstrated to provide a
maximum gain of more than 6 dBi.
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G. M. Bianco, R. Giuliano, G.
Marrocco, F. Mazzenga, and A. Mejia-Aguilar, IEEE Internet of Things
Journal, vol. 8, no. 3, pp. 1985-1999, 1
Feb.1, 2021, doi: 10.1109/JIOT.2020.3017044.
Typical mountain Search and
Rescue (SaR) operations require the
localization of the persons involved in
accidents in harsh environments. ARVA and
RECCOr are the current standards for the
localization in snowy environments although
their radio range is limited to some tens of
meters. In this paper, we prove by
experimental results that the Long Range
(LoRa) Low-Power Wide-Area Network (LPWAN)
technology is very promising for SaR
applications due to its extended radio range.
A LoRa-based system for SaR operations is
presented and analyzed. The localization of
the persons is obtained through an algorithm
based on path loss measurements. Radio path
loss models of body-worn LoRa devices in harsh
mountain environments are derived by
measurements.We observed that, although the
communication range of LoRa decreases from
kilometres to hundreds of meters in the tested
environments, at least 50% of the transmitted
packets can be received at distances about
five times greater than those achievable with
golden standard technologies such as ARVA. The
performances of the considered localization
algorithm are analyzed on the basis of the
collected data. The achievable accuracy is in
the order of meters around the true position
for a relatively large number of available
path loss measurements. Lastly, we propose and
detail a LoRa-based system for SaR operations.
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Radio-Frequency-Identification-Based
Intelligent Packaging
C.
Occhiuzzi, N. D'Uva, S. Nappi, S. Amendola, C.
Gialluca, V. Chiabrando, L. Garavaglia, G.
Giacalone, and G. Marrocco, IEEE Antennas and Propagation
Magazine, vol. 62, no. 5,
pp. 64-75, Oct. 2020, doi:
10.1109/MAP.2020.3003212.
Intelligent packaging for food
continuously generates informative
digital/analog content about the contained
products during their entire life span, thus
becoming one of the enabling elements of the
modern data-driven economy. Packaging shells
for fruits, augmented with low-cost wireless
sensors for the automatic estimation of the
ripening grade, can reduce waste, optimize
shelf exposure, suggest when produce should be
consumed, and engage customers through
enhanced user experiences. Radio-frequency
identification (RFID) with sensorless,
low-cost labels, empowered with
electromagnetic-based intelligence and
automatic classification tools, may stimulate
the widespread diffusion of this technology.
Focusing on avocados, this article presents an
experimental characterization of RFID’s
complex permittivity along with ripening and a
nearfield numerical model of a passive RFID
interrogation system with tagged fruit, aimed
at extracting the variation of electromagnetic
metrics of the RFID link during ripening. The
results are used to design and fabricate an
RFID totem for avocado monitoring that,
coupled with a properly trained binary tree
classifier, is capable of recognizing up to
three ripening levels of packaged fruits, with
an overall accuracy higher than 85% even if
the task is executed by unskilled operators.
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F. Camera, and G. Marrocco,
IEEE Sensors Journal, vol. 21,
no. 1, pp. 421-429, 1 Jan.1, 2021, doi:
10.1109/JSEN.2020.3014404.
Bio-integrated wireless sensors
in the form of conformable plaster, based on
the Radiofrequency Identification (RFID)
communication, have been recently proposed for
the battery-less measurement of the human skin
temperature. However, the response of the
Integrated Circuit (IC) transponder is
sensitive to the strength of the interrogating
power. Indeed, high power produces artifacts
on the sampled temperature up to 2 °C when the
mutual position between reader and sensors, as
well as the emitted power, can not be
carefully controlled. Hence, a reliable
adoption of this technology in real cases is
challenging and still in question. A combined
macro-scale electromagnetic-thermal model is
here introduced to predict and correct the
above artifact so that the temperature
measurement becomes insensitive to the RF
power collected by the IC. The method is based
on the new generation RFID ICs with on-chip
temperature sensor that are also capable to
give back the strength of the collected RF
power. The model is validated in controlled
conditions and then applied for different skin
temperature measurements on human body. An
average accuracy of 0.25 °C, compared with a
reference calibrated thermocouple, was
demonstrated in the considered tests.
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C. Miozzi, F. Amato, and G.
Marrocco, IEEE Journal of Radio Frequency
Identification, vol. 4, no. 4, pp. 398-405,
Dec. 2020, doi: 10.1109/JRFID.2020.3001692.
Epidermal sensors based on
battery-less Radiofrequency Identification
(RFID) aim at collecting biophysical
parameters with a high level of comfort for
the user. This paper investigates the
performance and durability of epidermal RFID
tags, equipped with a self-tuning RFID IC,
that are based either on copper wires or
conductive yarn. The tags are deployed onto an
ultra-thin stretchable and transparent
substrate to achieve comformability to body
discontinuities. A statistical analysis on
volunteers showed that, in the whole UHF band
(860-960 MHz), reliable read ranges of 1 m are
easily achieved while up to 2 m can be reached
in some favorable configurations. Both tags
withstand wear, mechanical stress due to the
movements of the body, sweating, and water. In
particular, the tag made of conductive yarn
lasts for more than 20 days. This new family
of epidermal tags are moreover suitable to
low-cost and large-scale manufacturing through
the widely available machines used for
wire-laying, bending, and shaping.
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Near-field
Constrained Design for Self-tuning
UHF-RFID Antennas
G. M. Bianco, S. Amendola, and G.
Marrocco, IEEE Transactions on Antennas
and Propagation, vol. 68, no. 10, pp.
6906-6911, Oct. 2020, doi:
10.1109/TAP.2020.2995315.
Recently introduced self-tuning
RFID tags are capable to dynamically modify
the input impedance of the embedded microchip
transponder in order to compensate possible
impedance mismatch with the antenna, thus
making the communication performance rather
insensitive to the nearby environment. A
general method for the design of this new
class of tags is presented with the purpose to
master the complex configuration, where the
tag is placed at a close distance from the
interrogating antenna and the free-space
assumption is not valid. A two-port system is
introduced and the networkoriented
reformulation of self-tuning action permits to
derive an optimization problem for the
minimization of the interrogation power for a
wide range of boundary conditions. The method
is demonstrated, both numerically and
experimentally, through the application of a
Finger Augmentation Device aimed to achieve a
smart interaction with touched objects.
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F.
Amato, C. Occhiuzzi, and G. Marrocco, IEEE Journal
of Radio Frequency Identification, vol. 4, no. 3,
pp. 176-185, Sept. 2020, doi:
10.1109/JRFID.2020.2998082.
Epidermal RFIDs, if integrated
within the nextgeneration (5G) wireless
architecture, would enable low-cost healthcare
applications for remote monitoring of
patients, realtime telesurgery, and augmented
sensing abilities. This paper explores,
through simulations and preliminary
experiments, epidermal 5G-RFIDs operating both
at microwave and mmWave frequencies. In
particular, it identifies the maximum gains of
epidermal antennas at their optimal sizes, the
achievable read ranges of passive 5G-RFID
links, and their possible data-rates.
Moreover, it demonstrates the compliance with
electromagnetic exposure regulations and
explores the benefits of epidermal arrays.
Loop transponders at microwave frequencies
(3.6 GHz) could provide the same read distance
(one meter) of their UHF counterparts while
having a smaller footprint (17 x 17 mm2) and
reaching a theoretical data-rate as high as
0.5 Gbps. At 28 GHz and 60 GHz, instead,
arrays could be used to both achieve
comparable performances and enable
beamsteering.
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C. Miozzi, G. Diotallevi, M.
Cirelli, P. P. Valentini, and G. Marrocco, IEEE Sensors, vol. 20, no. 14,
pp. 7588-7594, 15 July15, 2020, doi:
10.1109/JSEN.2020.2968386.
Recent developments in Materials
and Radiofrequency Identification (RFID)
technologies are currently boosting the
development of new class of flexible and
elastic epidermal devices for the wireless
remote monitoring of biophysical parameters.
As tightly bio-integrated with the skin,
epidermal antennas are subjected to mechanical
deformation during the natural movements and
gestures of the human body. The experienced
effect is a degradation of the communication
performance of the RFID link. In this
contribution, we evaluate the stiffness and
the change of the radiation gain of on-skin
UHF antennas in common gestures by a combined
mechanical-electromagnetic model to provide a
database and a modelling methodology to
improve the design of deformation-tolerant
skin antennas. The deformation of the skin is
firstly quantified by using a contactless 3D
scanner and then the communication impact is
predicted by means of an electromagnetic
analysis of stretched antennas for some
relevant cases of thin-wire layouts.
Preliminary numerical simulations and
experimentations demonstrated that constraints
over low stiffness and insensitivity of
radiation gain could be not always compatible.
An epidermal antenna may undergo up to 3-4 dB
of gain degradation that converts to 30%
reduction of the read distance for the strain
orientation producing the minimum mechanical
stiffness. The derived deformation database
could be useful to improve the design of more
robust epidermal antennas.
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M. Cappelli, V. Lopresto, R.
Cecchi, and G. Marrocco, IEEE Journal of Nuclear
Engineering and Radiation Science, vol. 6,
April 2020.
The aim of this work is to
present a preliminary investigation on the
propagation of electromagnetic fields
generated by wireless technologies inside a
nuclear facility or power plant. First, a
survey of currently proposed wireless
technologies for nuclear facilities and plants
has been carried out. Then, for selected
scenarios, the electromagnetic field
propagation has been studied by means of
electromagnetic simulation tools, and the
presence of the nuclear environment has been
simulated by properly modeling environmental
parameters and engineered barriers. The choice
of the proper simulation techniques and tools
is mandatory in order to simulate the effect
of the realistic environment on the
propagation. Accordingly, the feasibility of
wireless technologies application at nuclear
facilities can be assessed on the basis of
results achieved from simulated scenarios. The
goal is to analyze, for selected scenarios,
possible issues due to the propagation of an
electromagnetic field in the presence of
simplified barriers mimicking the real nuclear
environment. This approach can provide
indications on how to deploy potential
benefits of wireless technologies in a nuclear
environment, evaluating pros and cons of the
investigated technologies.
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