Body Effects on Thin Single-Layer Slot, Self-Complementary, and Wire Antennas

Makinen, R.; Kellomäki, Tiiti

doi:10.1109/tap.2013.2288786

Cited by 25 publications

(14 citation statements)

References 14 publications

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“…The reported read distances were in the range of 80-120 cm depending on the position of the tag over the body. The performance of several types of thin single-layer antennas (e.g slot, self-complementary and wire antenna) for plasterlike sensor application at 2.4 GHz study were extensively investigated in [17] to search for the antenna layout that is best suited to operate in the very close proximity of the human body. Very recently, we proposed [18] a preliminary idea for a passive RFID epidermal tag for the on-skin temperature measurement, with a specific focus to the use of a highly breathable membrane such as the the "-polycaprolacton.…”

Section: Introductionmentioning

confidence: 99%

Performance of Epidermal RFID Dual-loop Tag and On-Skin Retuning

Amendola

Milici

Marrocco

2015

IEEE Trans. Antennas Propagat.

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Originally introduced by the Material Science community, the Epidermal Electronics is now collecting interest also among Antenna engineers for the potentiality to achieve thin and flexible sensing transponders that are suitable to application over the epidermis. Unlike conventional wearable antennas, which are generally decoupled by the lossy human body by means of spacers or shielding sheets, epidermal tags need to be placed at a very close touch with the skin thus providing poor communication capabilities. This paper investigates, by means of a detailed numerical and experimental study, the performance of an epidermal dual-loop tag for UHF Radiofrequency Identification (RFID) depending on the specific placement over different parts of the human body and for a variety of volunteers. An on-body tuning mechanism is also introduced and demonstrated in real applications at the purpose to improve the tag response and hence to enable the use of a same tag layout for all the UHF RFID bands and for several placement loci.

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Section: Introductionmentioning

confidence: 99%

Performance of Epidermal RFID Dual-loop Tag and On-Skin Retuning

Amendola

Milici

Marrocco

2015

IEEE Trans. Antennas Propagat.

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“…This leads to reduction in the antennas' radiation performance through the consumption of energy in the interaction between the antenna's electromagnetic (EM) fields and the body. This inherently limits the attainable radiation efficiency of especially single-layered antennas [18]. In comparison, multilayered structures, such as microstrip patch [19], (planar) inverted-F antennas [20][21][22], and antennas based on substrate-integrated waveguides and metamaterials [23][24][25], benefit from the built-in antennabody isolation provided by the ground plane.…”

Section: Introductionmentioning

confidence: 99%

Wearable Passive E-Textile UHF RFID Tag Based on a Slotted Patch Antenna with Sewn Ground and Microchip Interconnections

Virkki

Wei

Liu

et al. 2017

International Journal of Antennas and Propagation

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We present a wearable passive UHF RFID tag based on a slotted patch antenna comprising only textile materials (e-textile, textile substrate, and conductive yearn). As a novel manufacturing approach, we realize the patch-to-ground and antenna-to-IC interfaces using only conductive thread and a sewing machine. We outline the electromagnetic optimization of the antenna for body-worn operation through simulations and present a performance comparison between the e-textile tag and a tag produced using regular electronics materials and methods. The measured results show that the textile tag achieves the electrical performance required in practical applications and that the slotted patch type antenna provides stable electromagnetic performance in different body-worn configurations.

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“…As largely discussed in the open literature, the human body proximity represents a critical issue for the wearable devices performance [1]- [21]. Since it is a non-homogeneous lossy material, it the human body affects the antenna input impedance and radiation efficiency, leading to a degradation of the overall system performance.…”

Section: Introductionmentioning

confidence: 99%

“…Then, it follows that low-frequency wearable antennas are electrically small, and only one of the two energy densities dominates in the antenna nearfield (NF) region. Since the human body is a non-magnetic material, electrically small magnetic antennas perform better than electrically small electric antennas, when they operate close to, or inside, the human body [20]- [21]. On the other hand, several body-centric wireless systems operate at relatively high frequency, such as those based on technologies like UHF RFID, Wireless Local Area Network (WLAN) or Bluetooth.…”

Section: Introductionmentioning

confidence: 99%

Design Considerations on the Placement of a Wearable UHF-RFID PIFA on a Compact Ground Plane

Michel

Colella

Casula

et al. 2018

IEEE Trans. Antennas Propagat.

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The robustness of wearable antennas to the human body proximity can be improved by properly placing the radiating element over a ground plane, or by shaping the ground plane, on the basis of the antenna electric and magnetic energy density distributions, aiming to confine the electric energy density in specific regions far from the antenna border. The effectiveness of the above design criterion has been assessed through both numerical analysis and experimental measurements, by optimizing the position of the radiating element of a wearable grounded UHF RFID tag operating at the ETSI band (865-868 MHz), with respect to its ground plane. A flexible tag characterization and performance evaluation platform is used to measure the tag sensitivity as a function of the antenna-body distance.

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Body Effects on Thin Single-Layer Slot, Self-Complementary, and Wire Antennas

Cited by 25 publications

References 14 publications

Performance of Epidermal RFID Dual-loop Tag and On-Skin Retuning

Performance of Epidermal RFID Dual-loop Tag and On-Skin Retuning

Wearable Passive E-Textile UHF RFID Tag Based on a Slotted Patch Antenna with Sewn Ground and Microchip Interconnections

Design Considerations on the Placement of a Wearable UHF-RFID PIFA on a Compact Ground Plane

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