scholarly journals Structural Design of Wearable Miniaturized Textile Antenna

2020 ◽  
Vol 10 (1) ◽  
pp. 12-17
Keyword(s):  
Structural Design ◽  
Return Loss ◽  
Performance Comparison ◽  
Wearable Antenna ◽  
Natural Choice ◽  
Lower Dielectric Constant ◽  
Textile Antenna ◽  
Almost All ◽  
Fabric Material ◽  
Free Status

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.

scholarly journals Investigation on Wearable Antenna under Different Bending Conditions for Wireless Body Area Network (WBAN) Applications

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Ismahayati Adam ◽  
Muhammad Ramlee Kamarudin ◽  
Ali H. Rambe ◽  
Norshakila Haris ◽  
Hasliza A. Rahim ◽  
...  
Keyword(s):  
Return Loss ◽  
Coupling Effect ◽  
Ground Plane ◽  
Wireless Body Area Network ◽  
Area Network ◽  
Radiation Characteristics ◽  
Antenna Structure ◽  
Wearable Antenna ◽  
Operating Frequency Range ◽  
Textile Antenna

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.

scholarly journals Power harvesting through flexible rectenna at dual resonant frequency for low power devices

2018 ◽  
Vol 7 (3.3) ◽  
pp. 647 ◽  
Author(s):  
V K. Singh ◽  
Anurag Saxena ◽  
Bharat Bhushan Khare ◽  
Vicky Shakya ◽  
Gyoo Soo Chae ◽  
...  
Keyword(s):  
Return Loss ◽  
Power Transmission ◽  
Electrical Energy ◽  
Wireless Power ◽  
Power Devices ◽  
Resonant Frequencies ◽  
Power Harvesting ◽  
Wearable Antenna ◽  
Textile Antenna ◽  
Epoxy Material

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. 

scholarly journals UNDERGRADUATE STUDENTS’ VIEWS ABOUT EMERGENCY DISTANCE EDUCATION DURING THE COVID-19 PANDEMIC

2020 ◽  
Vol 5 (1) ◽  
Author(s):  
Gürhan Durak ◽  
Serkan Çankaya
Keyword(s):  
Distance Education ◽  
University Students ◽  
Undergraduate Students ◽  
Education System ◽  
Diffusion Of Innovations ◽  
Performance Comparison ◽  
Integrated System ◽  
Online Questionnaire ◽  
Almost All ◽  
Distance Education System

With the Covid-19 pandemic, which was effective all over the world in early 2020, emergency distance education applications started. Universities in Turkey also suffered from this situation and quickly started their own distance education applications using their own facilities. Different applications carried out by universities have had different reflections upon education. For example, while some universities provided compulsory live classes, some universities did not. Students are the most important component of this process. In this respect, the purpose of this study was to examine university students' views about emergency distance education during the Covid-19 pandemic. In this qualitatively designed study, 32 students from 4 different universities were asked for their views. An online questionnaire form made up of open-ended questions was used as the data collection tool. The data were analyzed using the content analysis method, and the themes were created. As a result, two of the four universities used the software of Microsoft Teams as a distance education system, while others preferred the software of Moodle and ALMS. It could be said that the students who used Microsoft Teams, which is an integrated system where live lessons can be held, were more satisfied in this process. In addition, the students' views about the distance education system, the positive and negative aspects of the system, live course practices, communication with the instructor, getting feedback, socialization, motivation, academic performance, comparison with traditional teaching, etc. were reported and interpreted within the scope of the theories of Uses and Gratifications and Diffusion of Innovations. It was seen that among the university students almost all of whom were anxious before the distance education, the worries of those who took live lessons and used an integrated system were completely removed. In this respect, within the scope of the distance education system, it could be stated that the elements of live lessons and interaction have great importance for students. <p> </p><p><strong> Article visualizations:</strong></p><p><img src="/-counters-/edu_01/0720/a.php" alt="Hit counter" /></p>

scholarly journals Performance Comparison Of Shunt Rf Mems Switches

2021 ◽  
Vol 12 (5) ◽  
pp. 596-606
Author(s):  
S Girish Gandhi, I Govardhani, M Venkata Narayana, K Sarat Kumar
Keyword(s):  
Comparative Study ◽  
Insertion Loss ◽  
Return Loss ◽  
Rf Mems ◽  
Switching Time ◽  
Performance Comparison ◽  
Mems Switches ◽  
Mems Switch ◽  
Rf Mems Switches ◽  
And Performance

This is an attempt to compare three different shunt configured RF MEMS switches which offers a choice for applications in satellite and antennas. Advanced RF communication domain demands for design and modeling of RF MEMS switch which provides extremely reduced pull-in voltage, better isolation, low insertion loss, and with greater reliability. The proposed work manages with comparison of design modeling and performance of three different shunt configured RF MEMS switches. The proposed shunt configured RF MEMS switches are designed with different dimensions with different meandering techniques with perforations on beam structure helps in reducing the amount of voltage required for actuation of switch which is known as pull-in voltage. Comparative study of three different RF MEMS switches which involves in conducting electromechanical analysis are carried out using COMSOL multi physics tool and electromagnetic analysis are carried out using HFSS tool. Moreover the comparative study involves in comparing the values of pull-in voltage, switching time and capacitance, stress, insertion loss, return loss and isolation of three different RF MEMS switches. Proposed first switch model derives pull-in voltage of 16.9v with the switching time of 1.2µs, isolation of 47.70 dB at 5GHz and insertion loss of 0.0865 dB and return loss of 41.55 dB. Proposed second switch model derives pull-in voltage of 18.5v with the switching time of 2.5µs, isolation of 37.20 dB at 8GHz and insertion loss of 0.1177 dB and return loss of 38.60 dB. Proposed third switch model delivers pull-in voltage of 18.75v with the switching time of 2.56µs, isolation of 44.1552 dB at 8GHz and insertion loss of 0.0985 dB and return loss of 42.1004 dB.

Development of Novel Design to Enhance the Characteristics of Flexible Antenna

2020 ◽  
pp. 49-56
Author(s):  
Neha Nigam ◽  
Vinod Kumar Singh
Keyword(s):  
Return Loss ◽  
Data Transfer ◽  
Radiation Characteristics ◽  
Textile Antenna ◽  
Flexible Antenna ◽  
Novel Design ◽  
Triple Band

This chapter proposed triple band novel geometry and enhanced characteristics of flexible textile antenna. The proposed radio wire indicates wideband execution with wide data transfer capacity of 20.50% covering the recurrence scope of 6.3039 GHz to 7.7445 GHz, 11.57% covering the recurrence scope of 9.0694 GHz to 10.184 GHz, and 8.23% in the recurrence scope of 12.497 GHz to 13.57 GHz. In this chapter, reenacted outcomes like return loss, directivity, and radiation characteristics have been contemplated.

scholarly journals Performance Comparison of Reverse Transcriptases for Single-Cell Studies

2019 ◽  
Vol 66 (1) ◽  
pp. 217-228 ◽  
Author(s):  
Daniel Zucha ◽  
Peter Androvic ◽  
Mikael Kubista ◽  
Lukas Valihrach
Keyword(s):  
Single Cell ◽  
Reverse Transcription ◽  
Cell Model ◽  
Single Cells ◽  
Performance Comparison ◽  
Reaction Yield ◽  
Reverse Transcriptases ◽  
Reverse Transcription Pcr ◽  
Cell Experiment ◽  
Almost All

Abstract BACKGROUND Recent advances allowing quantification of RNA from single cells are revolutionizing biology and medicine. Currently, almost all single-cell transcriptomic protocols rely on reverse transcription (RT). However, RT is recognized as a known source of variability, particularly with low amounts of RNA. Recently, several new reverse transcriptases (RTases) with the potential to decrease the loss of information have been developed, but knowledge of their performance is limited. METHODS We compared the performance of 11 RTases in quantitative reverse transcription PCR (RT-qPCR) on single-cell and 100-cell bulk templates, using 2 priming strategies: a conventional mixture of random hexamers with oligo(dT)s and a reduced concentration of oligo(dT)s mimicking common single-cell RNA-sequencing protocols. Depending on their performance, 2 RTases were further tested in a high-throughput single-cell experiment. RESULTS All tested RTases demonstrated high precision (R2 &gt; 0.9445). The most pronounced differences were found in their ability to capture rare transcripts (0%–90% reaction positivity rate) and in their absolute reaction yield (7.3%–137.9%). RTase performance and reproducibility were compared with Z scores. The 2 best-performing enzymes were Maxima H− and SuperScript IV. The validity of the obtained results was confirmed in a follow-up single-cell model experiment. The better-performing enzyme (Maxima H−) increased the sensitivity of the single-cell experiment and improved resolution in the clustering analysis over the commonly used RTase (SuperScript II). CONCLUSIONS Our comprehensive comparison of 11 RTases in low RNA input conditions identified 2 best-performing enzymes. Our results provide a point of reference for the improvement of current single-cell quantification protocols.

Embroidery Leaf Shape Dipole Antenna Performances and Characterisation

2017 ◽  
Vol 7 (3) ◽  
pp. 1467
Author(s):  
N. J. Ramly ◽  
M. K. A. Rahim ◽  
N. A. Samsuri ◽  
H. A. Majid
Keyword(s):  
Return Loss ◽  
Leaf Shape ◽  
Dipole Antenna ◽  
Antenna Design ◽  
Operating Frequency ◽  
Ism Band ◽  
Textile Antenna ◽  
Different Types

In this paper, leaf shape textile antenna in ISM band has been chosen to study. The operating frequency of the dipole antenna is 2.45GHz. The effect of conductive threads with three different types of sewing has been analysed. The first type of sewing leaf shape dipole antenna is to stitch around itself and embroidered into a fleece fabric with circular follow by vertical and horizontal stitch respectively. From measured return loss, the antenna with circular stitch shows better performances with optimum resonances compared with the two types of stitching. The measured results confirm that the circular stitch is more suitable for leaf shape dipole antenna design. Thus it can be concluded that different stitch gives different results for leaf shape dipole antenna.

scholarly journals Performance Comparison of Swastika and Rectangular Shaped Microstrip Patch Antenna

2018 ◽  
Vol 1 (1) ◽  
pp. 11-14
Author(s):  
Suroj Burlakoti ◽  
Prakash Rai
Keyword(s):  
Radiation Pattern ◽  
Patch Antenna ◽  
Return Loss ◽  
Ground Plane ◽  
Performance Comparison ◽  
Microstrip Patch Antenna ◽  
Simulation Software ◽  
Patch Antennas ◽  
Microstrip Patch Antennas ◽  
Microstrip Patch

In this paper, Microstrip patch antennas with rectangular and swastika shape of patch are designed and its performance parameters are compared with each other. Rectangular and Swastika shaped patch are considered in this paper with common rectangular ground plane. The antenna is simulated at 2.4 GHz using HFSS simulation software. This work mainly includes modification of antenna patch to improve the antenna parameters. The parameters of antenna such as Return loss, VSWR Bandwidth and radiation pattern are compared using simulation. The performance of Swastika shaped antenna was found to be better than rectangular shaped microstrip patch antenna with improved Return Loss, VSWR, Bandwidth and Radiation Pattern.

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