Embroidered Βow-Tie Wearable Antenna for the 868 and 915 MHz ISM Bands

Kapetanakis, Theodoros N.; Pavec, Martin; Ioannidou, Melina P.; Nikolopoulos, Christos D.; Baklezos, Anargyros T.; Vardiambasis, Ioannis O.

doi:10.3390/electronics10161983

Cited by 11 publications

(7 citation statements)

References 31 publications

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“…The research is described in a few publications by Finnish and American researchers [ 9 , 23 , 24 ]. The classic/galvanic connection of the semiconductor chip with the antenna is used in the presented construction (the same as in [ 25 , 26 ]). Such a connection is vulnerable to the damaging effects of environmental hazards that occur throughout the life cycle of products.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Textile Substrates on the Performance of Textronic RFID Transponders

et al. 2022

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Recent advances in the development of innovative textronic products are often related to the implementation of radio-frequency identification (RFID) technology. Such devices contain components of wireless telecommunications systems, in which radiofrequency circuits should be designed taking into account not only the frequency band or destined application, but also the dielectric properties of the materials. As is known from the theory of RFID systems, the dielectric permittivity and loss angle of the substrates significantly affect the performance of RFID transponders. Therefore, the knowledge on the variability of these parameters is highly important in the context of developing new solutions in textronic devices with the RFID interface. According to the plan of studies, at the beginning, the comprehensive characterization and determination of the dielectric parameters of various types of textile substrates were carried out. On this basis, the influence of fabrics on the performance of textronic RFID (RFIDtex) tags was characterized with numerical calculations. As the RFIDtex transponders proposed by the authors in the patent PL231291 have an outstanding design in which the antenna and the chip are located on physically separated substrates and are galvanically isolated, the special means had to be implemented when creating a numerical model. On the other hand, the great advantage of the developed construction was confirmed. Since the impedance at the chip’s terminals is primarily determined by the coupling system, the selected fabrics have relatively low impact on the efficiency of the RFIDtex transponder. Such an effect is impossible to achieve with classical designs of passive or semi-passive transponders. The correctness of the simulations was verified on the exemplary demonstrators, in threshold and rotation measurements performed at the laboratory stand.

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Section: Introductionmentioning

confidence: 99%

The Influence of Textile Substrates on the Performance of Textronic RFID Transponders

et al. 2022

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“…In addition to this, other precision applications of conductive threads include embroidered antennas [ 22 , 23 ] and an investigation on the challenges of such fabrication [ 15 ], a wireless power transfer system reliant on conductive threads [ 24 ], and chipless RFID tags [ 25 ]. As RFID tags and antennas have very precise fabrication requirements in terms of conductor resistance and stability, many phenomena can occur when this changes, such as drops in efficiency, resonating frequency slips, beamwidth alterations, etc., as observed in [ 26 ] after repeated washing of a bow-tie ISM-band antenna.…”

Section: Introductionmentioning

confidence: 61%

A Study of the Performance Degradation of Conductive Threads Based on the Effects of Tensile Forces and Repeated Washing

2022

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In recent years, after the ongoing success in the creation of portable electronic devices, an increasing effort has been put in creating wearable devices capable of sensing multiple parameters while being imperceptible to the user. A field that has recently gained attention due to this is that of textile electronics. For this purpose, one of the most commonly used materials is conductive threads, capable of sustaining an electrical connection, while at the same time being part of a garment. As research on the performance and stability of such threads is scarce, the aim of this work is to study the effects of tension on readily available conductive threads and to verify their suitability and reliability for e-textile applications. After testing seven commercially available threads, this study demonstrates that the nominal parameters provided by the manufacturers are not in line with experimentation, and that both embroidery and washing have an impact on their performance.

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“…By crafting different-shaped slots inside the patch, this approach reduces antenna size and achieves multi-band [44].…”

Section: Dgs Principlementioning

confidence: 99%

Key Factors in the Implementation of Wearable Antennas for WBNs and ISM Applications: A Review WBNs and ISM Applications: A Review

et al. 2022

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The increasing usage of wireless technology has prompted the development of a new generation antenna compatible with the latest devices, with on-body antennas (wearable antennas) being one of the revolutionary applications. This modern design is relevant in technologies that require close human body contact, such as telemedicine and identification systems, due to its superior performance compared to normal antennas. Some of its finer characteristics include flexibility, reflection coefficient, bandwidth, directivity, gain, radiation, specific absorption rate (SAR), and efficiency that are anticipated to be influenced by the coupling and absorption by the human body tissues. Furthermore, improvements like band-gap structure and artificial magnetic conductors (AMC) and (DGS) are included in the wearable antenna that offers a high degree of isolation from the human body and significantly reduces SAR. In this paper, the development of on-body antennas and how they are affected by the human body were reviewed. Additionally, parameters that affect the performance of this new antenna model, such as materials and common technologies, are included as an auxiliary study for researchers to determine the factors affecting the performance of the wearable antenna and the access to a highly efficient antenna.

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Embroidered Βow-Tie Wearable Antenna for the 868 and 915 MHz ISM Bands

Cited by 11 publications

References 31 publications

The Influence of Textile Substrates on the Performance of Textronic RFID Transponders

The Influence of Textile Substrates on the Performance of Textronic RFID Transponders

A Study of the Performance Degradation of Conductive Threads Based on the Effects of Tensile Forces and Repeated Washing

Key Factors in the Implementation of Wearable Antennas for WBNs and ISM Applications: A Review WBNs and ISM Applications: A Review

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