Jeans Textile Antenna for Smart Wearable Antenna

Author(s):  
Kai-hong Wang ◽  
Jiu-sheng Li
2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Ismahayati Adam ◽  
Muhammad Ramlee Kamarudin ◽  
Ali H. Rambe ◽  
Norshakila Haris ◽  
Hasliza A. Rahim ◽  
...  

This paper analysed the effects of bending on the performance of a textile antenna wherein the antenna under test was made of felt substrate for both industrial, scientific, and medical (ISM) band and WBAN applications at 2.45 GHz. Moreover, the conductive material was used for the patch, and the ground plane used a 0.17 mm Shieldit textile. Meanwhile, the antenna structure was in the form of rectangular, with a line patch in between elements to abate the mutual coupling effect. The measured operating frequency range of the antenna spanned from 2.33 GHz to 2.5 GHz with a gain of 4.7 dBi at 2.45 GHz. In this paper, the antenna robustness was examined by bending the structure on different radii and degrees along both X- and Y-axis. Next, the effects on return loss, bandwidth, isolation, and radiation characteristics were analysed. This paper also discovered that the antenna’s performance remained acceptable as it was deformed, and the measured results agreed well with the simulation.


Sensors ◽  
2019 ◽  
Vol 19 (8) ◽  
pp. 1804 ◽  
Author(s):  
Sanchez-Montero ◽  
Lopez-Espi ◽  
Alen-Cordero ◽  
Martinez-Rojas

In recent years, the study and design of wearable antennas have been empowered given the success of Wireless Body Area Networks (WBAN) for healthcare and medical purposes. This work analyses a flexible textile antenna whose performance can be optimised by the careful selection of the substrate thickness of the textile material, and by varying the antenna’s geometrical shape. After considering these parameters, several arrangements of antennas were simulated using the Computer Simulation Technology software (CST). The results of the simulations were compared to the experimental prototypes manufactured on a flexible felt material for a range of thicknesses and curvatures of the antenna substrate. Such antenna designs can be utilised in off-body communications and ISM applications.


2021 ◽  
Author(s):  
Mahmoud Wagih ◽  
Geoffrey S. Hilton ◽  
Alex S. Weddell ◽  
Steve Beeby

<div>Owing to the mobility of a wearable antenna and the unpredictable body-centric communications environment, dual-polarization antennas are essential for both communications and energy harvesting. This paper presents a dual-polarized four-port textile antenna/rectenna for wearable simultaneous wireless information and power transfer (SWIPT) applications. The proposed antenna utilizes dual ports for both off-body communication and energy harvesting from horizontal and vertical polarizations. The antenna maintains a 100 MHz bandwidth with an S11 under -10 dB around 2.4 GHz in the presence and absence of the human body, and at least 10~dB small-signal and large-signal isolation between all ports. The antenna maintains a 70-88% measured total efficiency and 8.4--9.6 dBi gain for various on-phantom positions across both communication ports. The measured mutual coupling is under -10 dB between co-polarized rectenna/antenna ports, and under -16~dB between orthogonally-polarized ports. A high RF to DC peak power conversion efficiency of over 70% (+-5%) is achieved with a broadside harvesting pattern. Based on the proposed antenna's performance, SWIPT microstrip antennas can be adopted for both full-duplex and MIMO applications, significantly reducing the complexity of future battery-free networks for both wearable and non-wearable applications.</div>


2018 ◽  
Vol 7 (3.3) ◽  
pp. 647 ◽  
Author(s):  
V K. Singh ◽  
Anurag Saxena ◽  
Bharat Bhushan Khare ◽  
Vicky Shakya ◽  
Gyoo Soo Chae ◽  
...  

In Wireless power transmission, the transmission of electrical energy can be done without using any conductor or lead. After the simulation of wearable antenna, two resonant frequencies are obtained, i.e. 9.94 GHz and 7.35 GHz. For the designing of antenna, instead of using glass epoxy material, textile material is used having dielectric constant 1.7. The places where it is difficult to transfer the electrical energy, textile antenna is useful in those places. Ambient radio frequency can be converted in DC signal through the rectifier. All the graphs related to rectenna, such as return loss, output voltage and current at load are presented in this paper. Textile antenna for energy harvesting is de-signed in CST software and further rectenna circuit can be designed in Pspice Software. 


Worldwide demand of wearable devices is arduous. In field of movable technology ‘hands-free’ status is requirement of persistent communication. With this regards, extensive research has been carried out on wearable technologies. Antennas made of fully fabric material are natural choice. This work presents performance comparison of between classical micro-strip antenna, fabric antenna with metal patch and fully fabric antenna. The fabric antennas show better gain and return loss but are larger in size owing to lower dielectric constant of fabric material. The fabric antennas being conceptually similar to the traditional micro-strip antennas, almost all the micro-strip design techniques could be seamlessly applicable to them. This work further presents an innovative technique of introducing an edge slot in the radiating patch and achieves a reasonable size reduction. This edge slot wearable antenna has been fabricated and the results are compared well with simulated results.


2021 ◽  
Author(s):  
Mahmoud Wagih ◽  
Geoffrey S. Hilton ◽  
Alex S. Weddell ◽  
Steve Beeby

<div>Owing to the mobility of a wearable antenna and the unpredictable body-centric communications environment, dual-polarization antennas are essential for both communications and energy harvesting. This paper presents a dual-polarized four-port textile antenna/rectenna for wearable simultaneous wireless information and power transfer (SWIPT) applications. The proposed antenna utilizes dual ports for both off-body communication and energy harvesting from horizontal and vertical polarizations. The antenna maintains a 100 MHz bandwidth with an S11 under -10 dB around 2.4 GHz in the presence and absence of the human body, and at least 10~dB small-signal and large-signal isolation between all ports. The antenna maintains a 70-88% measured total efficiency and 8.4--9.6 dBi gain for various on-phantom positions across both communication ports. The measured mutual coupling is under -10 dB between co-polarized rectenna/antenna ports, and under -16~dB between orthogonally-polarized ports. A high RF to DC peak power conversion efficiency of over 70% (+-5%) is achieved with a broadside harvesting pattern. Based on the proposed antenna's performance, SWIPT microstrip antennas can be adopted for both full-duplex and MIMO applications, significantly reducing the complexity of future battery-free networks for both wearable and non-wearable applications.</div>


2018 ◽  
Vol 96 (7) ◽  
pp. 796-800
Author(s):  
Erkan Tetik ◽  
Gamze D. Tetik

Body-worn communication devices have attracted much attention due to their wide applications. In this regard, various wearable antennas that have lots of advantages have been designed by researchers in recent years. Metamaterials that have negative refractive index can also be used in the wearable antenna designs because they have an ability to eliminate harmful health effects. In this study, a metamaterial-based wearable microstrip patch textile antenna operating in industrial, scientific, and medical bands was designed and simulated. The radiation values of this antenna were analyzed. Then metamaterial-based electromagnetic band gap (EBG) structure and wearable antenna integration was designed. Two different integrated antenna designs (3 × 3 and 5 × 3) were proposed. We obtained the performances of these antenna designs and calculated the specific absorption rate (SAR) values. We calculated the absorbed power 48.8, 0.167, and 0.0485 W/kg for 10 g tissue of wearable microstrip patch antenna, EBG integrated wearable antenna with 3 × 3 design, and EBG integrated wearable antenna with 5 × 3 design, respectively. Because the SAR values of the EBG integrated wearable antenna designs are well below the standard values, we can say that the designs proposed in the study can be used in many areas, such as military, health monitoring, and wireless communication.


2017 ◽  
Vol 9 (10) ◽  
pp. 2029-2036 ◽  
Author(s):  
Esther F. Sundarsingh ◽  
Malathi Kanagasabai ◽  
Vimal Samsingh Ramalingam

This paper proposes a unique, first of its kind fabrication technique for the making of textile antennas. A novel method that provides scope for automation in textile antenna production is presented here. A completely integrated textile antenna fabrication method that eliminates the tasks of positioning and fastening of the various components of a patch antenna is discussed. The technique employs multilayer weaving for the production of a wearable antenna on a cotton substrate. Silver yarn is used for the conductive regions of the textile antenna. Two layers of woven cotton serve to isolate the radiating patch from the ground plane of the antenna. The designed antenna was chosen to operate at the frequency of 2.45 GHz for Wireless Local Area Network. The built prototype resonated at 2.43 GHz with a |S11|of −18.62 dB. The integrated textile antenna exhibited a gain of 1.06 dBi at 2.43 GHz.


10.31355/17 ◽  
2017 ◽  
Vol 1 ◽  
pp. 117-148
Author(s):  
Prafulla Kumar Padhi

NOTE: THIS ARTICLE WAS PUBLISHED WITH THE INFORMING SCIENCE INSTITUTE. Aim/Purpose.............................................................................................................................................................................................. Since the valuation of a born-global speculative start-up (BGSS) has been a guessing game and there is no framework in the literature from ethical fashion smart wearable (EFSW) venture valuation perspective, this research explores to create a holistic model using multi-stage valuation method to valuate BGSS at its inception and investigates how ethical is ethical fashion? Background................................................................................................................................................................................................ The concept of ‘Born-Global’ firm was introduced into business theory during 1988. Nowadays, ventures start with a global vision from their inception to introduce products and services in overseas markets. Speculative investment has been a common practice to start-up expedition. Investors gamble on speculative start-ups. The inception phase of any start-up is the embryonic phase and is, therefore, more speculative than successive phases for additional investments. BGSS at its inception possess no operating history. Today fashion industry is one of the largest industries globally, growing leaps and bounds with valuation at 3 trillion U.S. dollars. The emerging smart fashion wearable market projected to cross US$ 30 billion during 2017. Fashion exists not only in garments but also other wearable such as the bracelet, watches, jewelry, and other accessories. Ethical fashion is all about betterment for the people and community at large. This paper identifies the relevant actors and their impact on the ethical aspects and status of the fashion industry. Methodology............................................................................................................................................................................................... The methodology used in this research both qualitative and quantitative approach. Since ethical fashion is a social phenomenon, the qualitative approach is appropriate to deal with various perspective analysis of ethical fashion using case study on four ethical fashion smart wearable ventures. The quantitative method calibrates the valuation of a BGSS at the inception stage using a noble pragmatic multi-stage valuation method because it provides the incentive to focus on achieving the best risk/cost ratio. Contribution.............................................................................................................................................................................................. This research bestows valuable insight using a noble multi-stage valuation method that has been proven successful based on author´s extensive practice to value BGSS at its inception contributing new knowledge to the literature. The application of informing system to frame the discussion on the inter-disciplinary domain of ethical fashion smart wearable creates awareness for fashion industry stakeholders and academic researchers. Findings.................................................................................................................................................................................................... The analysis shows that BGSS is a contemporary phenomenon since so many smart fashions wearable companies have gone through thought provoking and compelling stories to became successful in a highly competitive smart fashion wearable industry. BGSS concept is a brand-new perspective in the EFSW academic research. The findings of this research provide information to various stakeholders of the fashion industry and benefit to a global community at large with a more nuanced understanding of the changes and challenges of the emerging EFSW industry and the way to measure the valuation of a venture at its inception. Recommendations for Practitioners......................................................................................................................................................... This paper reveals nuance understanding for the practitioners in the BGSS valuation at its inception. Since all the traditional valuation methods have their drawbacks when applied to the inception stage of BGSS, this study recommends using multi-stage valuation method because it provides incentive for the best risk/cost ratio. Fashion brands (designers and other stakeholders) should abide by the ethical criteria to make a difference in the global community at large by reducing degradation of the environmental conditions. For the future of ethical fashion, ethical choices must be an available alternative to customers. Fashion companies need to embark upon design to not only be ethical but also stylish, therefore need to create trust by adopting transparency and integrity throughout the value chain. Fashion brand should take advantage of ethical fashion criteria to provide assurance to consumers with socio-cultural aspects in mind, to promote their fashion collections effectively. Recommendation for Researchers............................................................................................................................................................... More research work needs to be accomplished to have a clear analysis of the ethical fashion perspective to cover environmental, socio-cultural, fair trade, human rights, animal rights and other aspects. It is important to study the various stages of BGSS valuation from growth stage to initial public offering stage and beyond to bridge the gap between academic research and practitioners using the multi-stage valuation method. Impact on Society.......................................................................................................................................................................................... Since ethical fashion is of great significance for the contemporary society, raising awareness among various cultural communities globally to promote avantgarde ways regarding ethical fashion criteria, specifically to curb the degradation of the environment, stopping the cruelty on animals and protecting the human rights among consumers is paramount. Future Research............................................................................................................................................................................................ This study will bridge the gap between practice and academic research, scholars should embark upon creating a total addressable market (TAM) theory and empirical analysis studies because the total addressable market is the key and practical determinant of BGSS success. Ethical fashion academic research should be pursued beyond sustainability on smart wearable.


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