Design of flexible textile antenna using FR4, jeans cotton and teflon substrates

Kavitha, A.; Swaminathan, Jaichander

doi:10.1007/s00542-018-4068-y

Cited by 54 publications

(23 citation statements)

References 3 publications

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“…For the dipole antenna, the shift observed ranges from 10 MHz to 60 MHz and for the loop antenna, the shift observed is in the range of 20 MHz to 50 MHz, for on-body scenarios when compared with the desired 2.4 GHz resonant frequency. [26,[31][32][33][34][35][36][37]. e novelty of the work described in this paper lies in the fabrication of highly conformal, flexible, and compact textile antennas using highly flexible customized copper threads in an automated manner.…”

Section: On-body Measurementsmentioning

confidence: 99%

Design and Performance Analysis of Compact Wearable Textile Antennas for IoT and Body-Centric Communication Applications

Varma

Sharma

John

et al. 2021

International Journal of Antennas and Propagation

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This paper presents two compact textile-based planar dipole and loop antennas for wearable communication applications operating in the 2.4 GHz industrial, scientific, and medical radio (ISM) bands. The antennas were fabricated on a 0.44 mm thin camouflaged-military print, cotton jean cloth using conductive copper threads, and sewing embroidery technique to create the radiating structure. Design and performance analyses of the antennas were carried out using simulations; further experiments were performed in anechoic chamber and indoor environment to validate the designs. The experiments were carried out in a free space scenario and on the various locations of the human subject such as the torso and limb joints. The performance of the antennas was investigated based on the reflection coefficient in normal and bent conditions corresponding to the different radii of the locations of the human limbs. The antennas perform well in free space and on-body scenarios in flat and bend conditions providing return loss below −10 dB in all cases with an acceptable resonant frequency close to 2.4 GHz due to the antenna bending and body effects. The radiation pattern measurements are also reported in this work for free space and on-body scenarios. It is observed that the presence of the human body significantly influences the antenna radiation pattern which leads to an increase in the front-to-back ratio and also makes the antenna more directive. Overall, the performance of the fabricated embroidered textile antennas was found suitable for various wearable body-centric applications in indoor environments.

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Section: On-body Measurementsmentioning

confidence: 99%

Design and Performance Analysis of Compact Wearable Textile Antennas for IoT and Body-Centric Communication Applications

Varma

Sharma

John

et al. 2021

International Journal of Antennas and Propagation

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“…One is to replace the antenna dielectric substrates with a textile substrate but still use conventional metal (such as copper) as the antenna material. [199][200][201] A representative example is an inkjet-printed filtering antenna operating from 2.45 to 4.6 GHz reported by Kao et al, where silver ink was printed on textile, showing performance stability after 5000 cycles of mechanical bending with a bending radius of 20 mm. [201] The other option is using conductive textile fabrics on textile substrate, resulting in a completely textile-based antenna.…”

Section: Flexible Antenna Based On Textile and Cnf Papermentioning

confidence: 99%

Flexible and Stretchable Microwave Electronics: Past, Present, and Future Perspective

Zhang

Lan

Qiu

et al. 2020

Adv Materials Technologies

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2000759 (6 of 38) www.advmattechnol.de Figure 4. Flexible microwave transistors. a) Schematic illustration of fabrication process flow of flexible microwave TFTs based on Si nanomembrane. Left, two-step transfer-printing of Si nanomembrane on flexible substrate with assist of PDMS stamp. Right, direct flip-printing Si nanomembrane on flexible substrate. Reproduced with permission. [72] Copyright 2010, Wiley-VCH. b) Flexible microwave Si TFT using direct flip-printing approach in (a). Reproduced under the terms of the Creative Commons Attribution 4.0 International License. [75] Copyright 2016, Springer Nature. c) Flexible microwave Si TFT using two-step approach in (a). Reproduced with permission. [72] Copyright 2010, Wiley-VCH. d) Cross-section SEM image of flexible Si MOSFET made by thinning a 65 nm node SOI wafer. Reproduced with permission. [45] Copyright 2013, American Institute of Physics. e) Optical images of flexible GaAs HBT on cellulose nanofibril (CNF) substrate. Reproduced under the terms of the Creative Commons Attribution 4.0 International License. [90] Copyright 2015, Springer Nature. f) Schematic illustration and normalized on-state conductance (G/G 0), maximum transconductance (g m /g m0) of flexible InAs MOSFET with self-aligned gate. Reproduced with permission. [53] Copyright 2012, American Chemical Society. g) Cross-section schematic illustration and gain curves of flexible InGaAs/InAlAs HEMT as function of frequency under various bending conditions. Reproduced with permission. [91] Copyright 2013, American Institute of Physics. h) Output power density (P OUT), power gain (G P) and power-added efficiency (PAE) of the flexible GaN HEMT on thermal conductive tape with thermal conductivity of 1.6 W m −1 K −1. Reproduced with permission. [92] Copyright 2017, Wiley-VCH. i) Photography of AlGaN/GaN film grown on BN coated sapphire substrate and printed on flexible tape. Reproduced with permission. [19] Copyright 2017, Wiley-VCH. j) Cross-section schematic illustration of bottom gate flexible graphene FET (GFET). Reproduced with permission. [93] Copyright 2013, American Chemical Society. k) Cross-section schematic illustration of top gate flexible GFET with self-aligned gate configuration. Reproduced with permission. [94] Copyright 2014, American Chemical Society. l) High-frequency characteristics of flexible GFET with gate length of 50 nm. Reproduced with permission. [95] Copyright 2018, Wiley-VCH. m) Schematic illustration and gain curves of flexible microwave transistor based on MoS 2 as function of frequency. Reproduced with permission. [96] Copyright 2014, Springer Nature. n) High-frequency characteristics of flexible microwave transistor based on black phosphorus (BP) as function of frequency. Reproduced with permission.

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“…Rapid development of cutting-edge technologies (e.g., 5G [1], internet of things [2], or wearable devices [3], including those for tele-medicine purposes [4]), leads to increasingly exacting requirements imposed on contemporary antenna structures. Among these, demands for miniaturization [5], multi-functionality [6], or multi-band operation [7] can be listed.…”

Section: Introductionmentioning

confidence: 99%

Expedited Feature-Based Quasi-Global Optimization of Multi-Band Antenna Input Characteristics With Jacobian Variability Tracking

Koziel

Pietrenko‐Dabrowska

2020

IEEE Access

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Design of modern antennas relies-for reliability reasons-on full-wave electromagnetic simulation tools. In addition, increasingly stringent specifications pertaining to electrical and field performance, growing complexity of antenna topologies, along with the necessity for handling multiple objectives, make numerical optimization of antenna geometry parameters a highly recommended design procedure. Conventional algorithms, particularly global ones, entail often-unmanageable computational costs, so alternative approaches are needed. This work proposes a novel method for cost-efficient globalized design optimization of multi-band antennas incorporating the response feature technology into the trust-region framework. It allows for unequivocal allocation of the antenna resonances even for poor initial designs, where conventional local algorithms fail. Furthermore, the algorithm is accelerated by means of Jacobian variability tracking, which reduces the number of expensive finite-differentiation updates. Two real-world antenna design cases are used for demonstration purposes. The optimization cost is comparable to that of local routines while ensuring nearly global search capabilities. INDEX TERMS Antenna design, input characteristics, EM-driven design, trust-region methods, response features.

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Design of flexible textile antenna using FR4, jeans cotton and teflon substrates

Cited by 54 publications

References 3 publications

Design and Performance Analysis of Compact Wearable Textile Antennas for IoT and Body-Centric Communication Applications

Design and Performance Analysis of Compact Wearable Textile Antennas for IoT and Body-Centric Communication Applications

Flexible and Stretchable Microwave Electronics: Past, Present, and Future Perspective

Expedited Feature-Based Quasi-Global Optimization of Multi-Band Antenna Input Characteristics With Jacobian Variability Tracking

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