Dual-Band Elliptical Planar Conductive Polymer Antenna Printed on a Flexible Substrate

2015 ◽  
Vol 63 (12) ◽  
pp. 5864-5867 ◽  
Author(s):  
Z. Hamouda ◽  
J.-L. Wojkiewicz ◽  
A. A. Pud ◽  
L. Kone ◽  
B. Belaabed ◽  
...  
Keyword(s):  
Flexible Substrate ◽  
Conductive Polymer ◽  
Dual Band

scholarly journals A Printed Wearable Dual-Band Antenna for Wireless Power Transfer

Sensors ◽  
2019 ◽  
Vol 19 (7) ◽  
pp. 1732 ◽  
Author(s):  
Mohammad Haerinia ◽  
Sima Noghanian
Keyword(s):  
High Frequency ◽  
Flexible Substrate ◽  
Wireless Power Transfer ◽  
Dual Band ◽  
Power Transfer ◽  
Wireless Power ◽  
Dual Band Antenna ◽  
Measurement Results ◽  
Receiving Antenna ◽  
Transmitting Antenna

In this work, a dual-band printed planar antenna, operating at two ultra-high frequency bands (2.5 GHz/4.5 GHz), is proposed for wireless power transfer for wearable applications. The receiving antenna is printed on a Kapton polyimide-based flexible substrate, and the transmitting antenna is on FR-4 substrate. The receiver antenna occupies 2.1 cm 2 area. Antennas were simulated using ANSYS HFSS software and the simulation results are compared with the measurement results.

scholarly journals Fabrication and Performance of Graphene Flexible Pressure Sensor with Micro/Nano Structure

Sensors ◽  
2021 ◽  
Vol 21 (21) ◽  
pp. 7022
Author(s):  
Weibin Wu ◽  
Chongyang Han ◽  
Rongxuan Liang ◽  
Jian Xu ◽  
Bin Li ◽  
...  
Keyword(s):  
Pressure Sensor ◽  
Mass Fraction ◽  
Flexible Substrate ◽  
Conductive Polymer ◽  
Pressure Sensors ◽  
Carbon Paste ◽  
Alloy Plate ◽  
Bionic Structure ◽  
Flexible Pressure Sensor ◽  
Laser Flux

Laser-induced graphene (LIG) has been widely used in flexible sensors due to its excellent mechanical properties and high conductivity. In this paper, a flexible pressure sensor prepared by bionic micro/nanostructure design and LIG mass fraction regulation is reported. First, prepared LIG and conductive carbon paste (CCP) solutions were mixed to obtain a conductive polymer. After the taro leaf structure was etched on the surface of the aluminum alloy plate by Nd:YAG laser processing, the conductive polymer was evenly coated on the template. Pressure sensors were packaged with a stencil transfer printing combined with an Ecoflex flexible substrate. Finally, the effects of different laser flux and the proportion of LIG in the composite on the sensitivity of the sensor are discussed. The results show that when the laser flux is 71.66 J·cm−2 and the mass fraction of LIG is 5%, the sensor has the best response characteristics, with a response time and a recovery time of 86 ms and 101 ms, respectively, with a sensitivity of 1.2 kPa−1 over a pressure range of 0–6 kPa, and stability of 650 cycle tests. The LIG/CCP sensor with a bionic structure demonstrates its potential in wearable devices.

scholarly journals A compact dual-band semi-flexible antenna at 2.45 GHz and 5.8 GHz for wearable applications

2021 ◽  
Vol 10 (3) ◽  
pp. 1739-1746
Author(s):  
S. M. Shah ◽  
A. A. Rosman ◽  
M. A. Z. A. Rashid ◽  
Z. Z. Abidin ◽  
F. C. Seman ◽  
...  
Keyword(s):  
Absorption Rate ◽  
Specific Absorption Rate ◽  
Flexible Substrate ◽  
Input Power ◽  
Substrate Material ◽  
Dual Band ◽  
Reflection Coefficients ◽  
Resonant Frequencies ◽  
Low Profile ◽  
Flexible Antenna

In this work, a compact dual-band semi-flexible antenna operating at         2.45 GHz and 5.8 GHz for the industrial, scientific and medical (ISM) band is presented. The antenna is fabricated on a semi-flexible substrate material, Rogers Duroid RO3003™ with a low-profile feature with dimensions of 30×38 mm2 which makes it a good solution for wearable applications. Bending investigation is also performed over a vacuum cylinder and the diameters are varied at 50 mm, 80 mm and 100 mm, that represents the average human arm’s diameter. The bending investigation shows that reflection coefficients for all diameters are almost similar which imply that the antenna will operate at the dual-band resonant frequencies, even in bending condition. The simulated specific absorption rate (SAR) in CST MWS® software shows that the antenna obeys the FCC and ICNIRP guidelines for 1 mW of input power. The SAR limits at 2.45 GHz for 1 g of human tissue is simulated at 0.271 W/kg (FCC standard: 1.6 W/kg) while for 10 g is at 0.0551 W/kg (ICNIRP standard: 2 W/kg. On the other hand, the SAR limits at 5.8 GHz are computed at 0.202 W/kg for 1 g and 0.0532 W/kg for 10 g.

scholarly journals Simple Fabrication of Flexible Biosensor Arrays Using Direct Writing for Multianalyte Measurement from Human Astrocytes

2019 ◽  
Vol 25 (1) ◽  
pp. 33-46 ◽  
Author(s):  
James K. Nolan ◽  
Tran N. H. Nguyen ◽  
Khanh Vy H. Le ◽  
Luke E. DeLong ◽  
Hyowon Lee
Keyword(s):  
Cell Culture ◽  
Flexible Substrate ◽  
Conductive Polymer ◽  
Neural Cells ◽  
Direct Writing ◽  
Culture Dish ◽  
Biosensor Arrays ◽  
Human Astrocytes ◽  
Fetal Bovine ◽  
Phosphate Buffered Saline

Simultaneous measurements of glucose, lactate, and neurotransmitters (e.g., glutamate) in cell culture over hours and days can provide a more dynamic and longitudinal perspective on ways neural cells respond to various drugs and environmental cues. Compared with conventional microfabrication techniques, direct writing of conductive ink is cheaper, faster, and customizable, which allows rapid iteration for different applications. Using a simple direct writing technique, we printed biosensor arrays onto cell culture dishes, flexible laminate, and glass to enable multianalyte monitoring. The ink was a composite of PEDOT:PSS conductive polymer, silicone, activated carbon, and Pt microparticles. We applied 0.5% Nafion to the biosensors for selectivity and functionalized them with oxidase enzymes. We characterized biosensors in phosphate-buffered saline and in cell culture medium supplemented with fetal bovine serum. The biosensor arrays measured glucose, lactate, and glutamate simultaneously and continued to function after incubation in cell culture at 37 °C for up to 2 days. We cultured primary human astrocytes on top of the biosensor arrays and placed arrays into astrocyte cultures. The biosensors simultaneously measured glucose, glutamate, and lactate from astrocyte cultures. Direct writing can be integrated with microfluidic organ-on-a-chip platforms or as part of a smart culture dish system. Because we print extrudable and flexible components, sensing elements can be printed on any 3D or flexible substrate.

scholarly journals A novel type of wearable dual-band antenna based on coplanar waveguide feeding for wearable wireless communications

2021 ◽  
Vol 51 (2) ◽  
Author(s):  
Zhengrui He ◽  
Jie Jin
Keyword(s):  
Flexible Substrate ◽  
Coplanar Waveguide ◽  
Dual Band ◽  
Center Frequency ◽  
Suitable Candidate ◽  
Wearable Antenna ◽  
Dual Band Antenna ◽  
Simulation Results ◽  
Flexible Antenna ◽  
Different Parts

A flexible and compact coplanar waveguide feed (CPW-fed) wearable antenna is introduced for wireless wearable communications applications at the industrial scientific medical (ISM) band. The proposed antenna consists of copper, which is used as the radiation patch and ground planes printed on the same side of polyimide flexible substrate. The overall size of the antenna is 30 mm × 28 mm × 0.08 mm, the results show that the antenna can transmit and receive signals in two frequency bands of 1.89–2.67 GHz and 3.02–3.23 GHz, in which radiating properties are characterized and agree well with the simulation results. The antenna is bent in different directions to further investigate the reflection coefficient and corresponding effect on the antenna under bending. The center frequency of the antenna is slightly shifted towards higher and lower frequencies when antenna is bent in X-axis and Y-axis, respectively. Furthermore, the wearability of the antenna is verified when the antenna is placed on different parts of the human body such as wrist and chest. Hence, the proposed flexible antenna is a suitable candidate for wearable wireless communication applications.

Design of Slotted Hexagonal Wearable Textile Antenna Using Flexible Substrate

2020 ◽  
pp. 40-48
Author(s):  
Lalita Kumari ◽  
Lalit Kaushal ◽  
Deepak Kumar
Keyword(s):  
Reflection Coefficient ◽  
Flexible Substrate ◽  
Ground Plane ◽  
Dual Band ◽  
Radiation Characteristics ◽  
Textile Antenna ◽  
Copper Tape

In this chapter, a dual wideband textile antenna is proposed for WLAN and WiMax application. For antenna to be wearable, jeans material is used as a substrate to make ground plane, and copper tape is used to make patch of the anticipated antenna. The proposed antenna shows dual band performance with bandwidth of 82.48% covering 1.456 GHz to 3.5 GHz and 13.39% covering 4.32 GHz to 4.94 GHz. The simulated results like reflection coefficient, directivity, and radiation characteristics have been studied and analyzed.

Dual-Band Flexible Antenna for WLAN/WiMAX Applications

2019 ◽  
Vol 09 ◽  
Author(s):  
Poonam Thanki ◽  
Falguni Raval
Keyword(s):  
Wireless Local Area Network ◽  
Local Area Network ◽  
Flexible Substrate ◽  
Ground Plane ◽  
Local Area ◽  
Dual Band ◽  
Impedance Bandwidth ◽  
Area Network ◽  
Compact Size ◽  
Flexible Antenna

Aims: This paper presents the development of Co-Planar Waveguide (CPW) fed dualband, compact, and flexible antenna. The antenna is designed on flexible substrate jeans; so, it is suitable for wearable applications. <p></p> Objectives: The proposed antenna generates dual-band at 3.36GHz –3.61GHz and at 5.01 GHz – 5.18 GHz. The antenna has a compact size of 40×30 mm2. The antenna consists of a rectangular patch having a slot which is responsible for the first band and slot in the ground plane which is responsible for the second band. <p></p> Methods: By optimizing the dimensions, the antenna gives dual-band at 3.5 GHz and 5.1 GHz with impedance bandwidth of 250 MHz and 170 MHz, respectively. The performance of the antenna such as gain and radiation pattern over the operating band has been also discussed. <p></p> Conclusion: This proposed antenna with the first band at 3.5GHz is suitable for Wi-MAX (Worldwide Interoperability for Microwave Access) and second band at 5.1GHz is suitable for Higher Wireless Local Area Network applications (WLAN). <p></p>

Fabrication of PEDOT:PSS/Graphene Conductive Ink Printed on Flexible Substrate

2017 ◽  
Vol 264 ◽  
pp. 70-73 ◽  
Author(s):  
Netnapa Eawwiboonthanakit ◽  
Mariatti Jaafar ◽  
Zulkifli Ahmad ◽  
Naoto Ohtake ◽  
Banhan Lila
Keyword(s):  
Redox Potential ◽  
Low Cost ◽  
Flexible Substrate ◽  
Electronic Devices ◽  
Conductive Polymer ◽  
Conductive Ink ◽  
Sheet Resistivity ◽  
Conductive Pattern ◽  
Flexible Electronic ◽  
Inkjet Printer

Nowadays, flexible electronic is an important technology to produce flexible electronic devices due to it offers the attractive features such as possibility of product types and designs, with reducing size and weight, and low cost. Poly (3,4-ethelenedioxythiophene):poly (stylenesulfonate) (PEDOT:PSS) is a conductive polymer which possess high conductivity, high electrochemical, and low redox potential. PEDOT:PSS and PEDOT:PSS/Graphene (GP)/Dimethyl sulfoxide (DMSO) conductive ink ware deposited on Polyethylene terephthalate (PET) flexible substrate using desktop inkjet printer. Conductivity and thickness of conductive pattern at 1, 3, 5, 10, 20 layers were investigated in this study. It is observed that sheet resistivity of the conductive pattern is influenced by number of printed layers. Addition of GP at 20 layers of PEDOT:PSS/GP/DMSO conductive pattern exhibits the lowest sheet resistivity at 44 ohm/󠇯󠇯sq compared to PEDOT:PSS conductive pattern of 1.81×104 ohm/󠇯󠇯sq.

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