Changes of electric current on a normal-mode helical antenna inside a human body

Baharin, Rasyidah Hanan Mohd; Yamada, Yoshıhıde; Kamardin, Kamilia; Michishita, Naobumi

doi:10.1109/cama.2017.8273465

Cited by 3 publications

(1 citation statement)

References 9 publications

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“…A helical antenna is mainly fabricated by winding a conductive material and its geometrical parameters have an important impact on its electromagnetic properties in terms of input impedance and radiation pattern. Usually, these helical antenna properties are exploited for several scenarios such as phased antenna arrays for millimeter waves and wireless power transfer applications [14,15], wireless sensor nodes in smart agriculture [16] as well as biomedical applications [17][18][19]. However, to the authors' knowledge, in the literature, very few examples can be found where a helical antenna has been used in a RFID tag.…”

Section: Introductionmentioning

confidence: 99%

Stretchable Textile Yarn Based on UHF RFID Helical Tag

2021

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In the context of wearable technology, several techniques have been used for the fabrication of radio frequency identification (RFID) tags such as 3D printing, inkjet printing, and even embroidery. In contrast to these methods where the tag is attached to the object by using sewing or simple sticking, the E-Thread® technology is a novel assembling method allowing for the integration of the RFID tag into a textile yarn and thus makes it embeddable into the object at the fabrication stage. The current E-Thread® yarn uses a RFID tag in which the antenna is a straight half-wave dipole that makes the solution vulnerable to mechanical strains (i.e., elongation). In this paper, we propose an alternative to the current RFID yarn solution with the use of an antenna having a helical geometry that answers to the mechanical issues and keeps quite similar electrical and radiative properties with respect to the present solution. The RFID helical tag was designed and simulated taking into consideration the constraints of the manufacturing process. The helical RFID tag was then fabricated using the E-Thread® technology and experimental characterization showed that the obtained structure exhibited good performance with 10.6 m of read range in the ultra high frequency (UHF) RFID band and 10% of tolerance in terms of elongation.

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Section: Introductionmentioning

confidence: 99%

Stretchable Textile Yarn Based on UHF RFID Helical Tag

2021

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Performance Analysis of Normal Mode Helical Antenna in Seawater

Razali

Ngah

Kamardin

et al. 2020

2020 IEEE International RF and Microwave Conference (RFM)

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Structure optimization of an ultrahigh frequency radio frequency identification tag thread based on the normal mode helix dipole antenna

Zhang

Xiong

et al. 2020

Textile Research Journal

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This paper describes the design of a novel ultrahigh frequency radio frequency identification (UHF RFID) tag thread that mainly consisted of the common yarn and the normal mode helix dipole antenna. The linear dipole antenna for the UHF RFID tag thread was too long to miniaturize the tag. In order to maximize the read performance and miniaturize the size of the tag, the basic antenna structure parameters, such as the helical pitch and single arm length, were optimized by analyzing the radiation parameter S11 of the normal mode helix dipole antenna based on simulation experiments. The simulation experiments started with optimizing the single arm length to obtain the minimum of the S11 parameter at resonant frequency, then the helical pitch was further optimized to limit the resonant frequency to the UHF range. The simulation results showed the resonant frequency rises with an increase of helical pitch and declines with an increase of single arm length. Furthermore, a series of UHF RFID tag threads with good performance from the simulation cases were prepared, and the performance of the optimized tag was validated. Generally, the UHF RFID tag thread with optimized helix dipole antenna could reduce the axial length of the tag by 57% and improve the reading range by 500%, and its performance was greatly superior to that of the UHF RFID tag thread with the classical linear dipole antenna.

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Changes of electric current on a normal-mode helical antenna inside a human body

Cited by 3 publications

References 9 publications

Stretchable Textile Yarn Based on UHF RFID Helical Tag

Stretchable Textile Yarn Based on UHF RFID Helical Tag

Performance Analysis of Normal Mode Helical Antenna in Seawater

Structure optimization of an ultrahigh frequency radio frequency identification tag thread based on the normal mode helix dipole antenna

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