Logo antenna on textile materials

International Journal of Antennas and Propagation

Corchia²,

Benedetto³

et al. 2016

Self Cite

A wireless charger for low capacity thin-film batteries is presented. The proposed device consists of a nonradiative wireless resonant energy link and a power management unit. Experimental data referring to a prototype operating in the ISM band centered at 434 MHz are presented and discussed. In more detail, in order to facilitate the integration into wearable accessories (such as handbags or suitcases), the prototype of the wireless energy link was implemented by exploiting a magnetic coupling between two planar resonators fabricated by using a conductive fabric on a layer of leather. From experimental data, it is demonstrated that, at 434 MHz, the RF-to-RF power transfer efficiency of the link is approximately 69.3%. As for the performance of the system as a whole, when an RF power of 7.5 dBm is provided at the input port, a total efficiency of about 29.7% is obtained. Finally, experiments performed for calculating the charging time for a low capacity thin-film battery demonstrated that, for RF input power higher than 6 dBm, the time necessary for recharging the battery is lower than 50 minutes.

Section: Resultsmentioning

confidence: 99%

A Wearable Wireless Energy Link for Thin-Film Batteries Charging

International Journal of Antennas and Propagation

Corchia²,

Benedetto³

et al. 2016

Self Cite

“…(a) NWCFs [11,12] (b) Conductive threads [13][14][15][16] (c) Electro-textiles [17][18][19][20][21][22][23][24][25] Generally, materials that fall into the NWCF and conductive thread categories allow to obtain better spatial resolution and better performance in terms of integration of the antenna with the clothes/surface mounted components (see Table 1). In the following, two fabrication techniques that employ these materials are presented and discussed.…”

Section: Wearable Antenna Fabrication Techniquesmentioning

confidence: 99%

“…This means that, in the final product, the embroidery and the textile substrate are intertwined as a seamless block (as opposed to the antenna being just "attached" to the clothes when other fabrication techniques are used [11,12,[17][18][19][20][21][22][23][24][25]). As a result, embroidered antennas are also flexible, and they are not affected by everyday use of the piece of clothing (e.g., wearing, washing [16], and ironing) (see Table 1).…”

Section: Hand Embroidered Antennasmentioning

confidence: 99%

“…To test the durability of antennas fabricated using an adhesive-backed NWCF, a washing, 0°2 0°3 0°4 0°5 0°6 0°7 0°8 0°9 0°1 00°1 10°1 20°1 30°1 40°1 50°1 60°1 70°1 80°1 90°2 00°2 10°2 20°2 30°2 40°2 50°2 60°2 70°2 80°2 90°3 00°3 10°3 20°3 30°3 40°3 drying, and ironing test was performed on the wearable antenna proposed in [12]. The antenna was a proximityfed planar monopole on a ground plane, wherein the monopole geometry mimicked the logo of the famous Apple Inc. company.…”

Section: Durability Testmentioning

confidence: 99%

See 1 more Smart Citation

Wearable Antennas for Remote Health Care Monitoring Systems

Corchia

International Journal of Antennas and Propagation

Benedetto

et al. 2017

Self Cite

Remote monitoring of the elderly in telehealth applications requires that the monitoring must not affect the elderly's regular habits. To ensure this requirement, the components (i.e., sensor and antenna) necessary to carry out such monitoring should blend in with the elderly's daily routine. To this end, an effective strategy relies on employing wearable antennas that can be fully integrated with clothes and that can be used for remotely transmitting/receiving the sensor data. Starting from these considerations, in this work, two different methods for wearable antenna fabrication are described in detail: the first resorts to the combined use of nonwoven conductive fabrics and of a cutting plotter for shaping the fabric, whereas the second considered fabrication method resorts to the embroidery of conductive threads. To demonstrate the suitability of the considered fabrication techniques and to highlight their pros and cons, numerical and experimental results related to different wearable antennas are also reported and commented on. Results demonstrate that the presented fabrication techniques and strategies are very flexible and can be used to obtain low-cost wearable antennas with performance tailored for the specific application at hand.

“…Even the European Commission has recently stated that future wearables will have to be "shapeable, stretchable and washable/cleanable on-demand", emphasizing that a wearable should look like natural clothing in terms of comfortability, breathability and washability [13]. One of the strategies to overcome these limitations is to use textile materials for fabricating the devices [14,15] and to resort to chipless devices [16]. This would lead to a potentially infinite service-life of the devices, and it would also lower energy consumption.…”

Section: Introductionmentioning

confidence: 99%

Fully-Textile, Wearable Chipless Tags for Identification and Tracking Applications

Corchia

Benedetto

et al. 2020

Sensors

Self Cite

In this work, two fully-textile wearable devices, to be used as chipless identification tags in identification and tracking applications are presented. For the fabrication of the fully-textile tags, a layer of fleece was used as a substrate, while an adhesive non-woven conductive fabric was employed for the conductive parts. To allow radio-frequency identification of these chipless tags, two alternative techniques were used. One relies on associating a binary code with the resonance frequency of resonant devices: the presence/absence of the resonance peaks in the transmission scattering parameter, | S 21 | , of a set of resonators is used to encode a string of bits. The second technique for accomplishing radio-frequency identification of the chipless tags resorts to a frequency-shift coding technique, which is implemented by modifying the configuration of a hairpin resonator. The obtained numerical and experimental results confirm the suitability of the proposed strategies for obtaining entirely-textile, wearable chipless tags for identification and tracking purposes, which can be particularly useful, especially in the industrial sector. In this field, in fact, the proposed solutions would guarantee a seamless integration with clothes and would facilitate the user’s interaction with the IoT infrastructure. In this regard, one of the envisaged application scenarios related to the tracking of hides in the leather industry is also presented.