scholarly journals Microstrip band-stop filter based on double negative metamaterial

2022 ◽  
Vol 12 (2) ◽  
pp. 1579
Author(s):  
Badr Nasiri ◽  
Ahmed Errkik ◽  
Jamal Zbitou
Keyword(s):  
Resonant Frequency ◽  
Mobile Communications ◽  
Relative Permittivity ◽  
Low Cost ◽  
Double Negative ◽  
Fractional Bandwidth ◽  
Microstrip Filter ◽  
Global System ◽  
Band Stop Filter ◽  
Transmission Quality

In this work, we present a novel miniature band stop filter based on double negative metamaterial, this circuit is designed on a low-cost substrate FR-4 of relative permittivity 4.4 and low tangential losses 0.002. The proposed filter has a compact and miniature size of 15 mm in length and 12mm in width without the 50 Ω feed lines. The resonator was studied and analyzed with a view to achieving a band-stop behavior around its resonant frequency. The band-stop characteristics are obtained by implementing the metamaterial resonator on the final structure. The obtained results show that this microstrip filter achieves fractional bandwidth of 40% at 2 GHz. Furthermore, excellent transmission quality and good attenuation are achieved. This filter is an adequate solution for global system for mobile communications (GSM).

Wireless Communication System Development of Mobile Robot Based on Embedded Technology

2012 ◽  
Vol 151 ◽  
pp. 641-645
Author(s):  
Xiang Juan Liu
Keyword(s):  
Wireless Communication ◽  
Monitoring System ◽  
Mobile Communications ◽  
Remote Monitoring ◽  
System Development ◽  
Low Cost ◽  
Complete Solution ◽  
Wheeled Mobile Robots ◽  
Global System ◽  
Remote Monitoring System

Using the broad coverage of Global System for Mobile communications GSM (Global System for Mobile Communication) wireless network, monitoring remote target is one of research hot spots of remote control. The fact of applying the wireless communication technology, embedded processing techniques to remote monitoring system to realize the complete solution of the wireless remote monitoring system has strong industry value and research significance.This article offers a kind of monitoring system based on GSM. With wheeled mobile robots as an experimental platform, once robot detect water, fire, gas leakage or illegal invasion through the sensor, it will report to the householder through the short message in order to take emergency measures. Take GSM network as the communication channels , because it has a series of advantages such as fastness, reliability, low cost, less maintenance costs ,etc

Abstract TP250: Defining Technical Quality Standards for Mobile Telestroke Assessment: A Substudy of the Improving Treatment with Rapid Evaluation of Acute Stroke via Mobile Telemedicine (iTREAT) Mobile Telestroke Platform

Stroke ◽  
2016 ◽  
Vol 47 (suppl_1) ◽  
Author(s):  
Jason M Lippman ◽  
Zachary G Sutton ◽  
Timothy L McMurry ◽  
Brian Gunnell ◽  
Jack Cote ◽  
...  
Keyword(s):  
Acute Stroke ◽  
High Speed ◽  
Low Cost ◽  
Video Quality ◽  
Stroke Care ◽  
Video Data ◽  
Acute Stroke Care ◽  
Technical Standards ◽  
Quality Ratings ◽  
Transmission Quality

Introduction: In-ambulance use of remote videoconferencing for prehospital stroke assessment (mobile telestroke) is an emerging innovation in acute stroke care. As a new technology, there is a dearth of technical standards to ensure transmission quality and guide deployment in various EMS settings. Hypothesis: Subjective video quality ratings during in-vehicle mobile telestroke assessment correlate to objective video data transmission metrics. Methods: We performed videoconferencing via a low-cost, utilitarian mobile telestroke platform: tablet endpoint, high-speed 4G LTE modem, external antennae, HIPAA-secure videoconferencing application, and portable bracket mounting. We held test calls along typical ambulance routes recording transmission quality by a stationary and a mobile rater. We used a standardized 6-point scale of video quality: rating ≥ 4 deemed acceptable for mobile telestroke assessment. We recorded jitter, the variance in transmission data reception order, as simultaneously reported by the videoconferencing application. Results: We completed five test runs yielding 64 data ratings. Average jitter for ratings 1 through 6 was 434.9ms (SD = 407), 106.1ms (SD = 110), 41.4ms (SD = 29), 35.3ms (SD = 15), 29.5ms (SD = 6), and 29.0ms (SD = 2) respectively. Analyzing the raw data yielded an R2 of 0.41. As seen in Chart 1, video quality decreased as average jitter increased, but jitter values as low as 30ms were still seen across video transmission of all qualities. Conclusion: These preliminary data suggest modest correlation of transmission variance with subjective quality ratings using a low-cost mobile telestroke platform along rural-based ambulance routes. However, average transmission variance correlated highly (R2 = 0.93) suggesting more data ratings may improve the correlation. Testing of our mobile telestroke platform to assess performance and clinical efficacy as well as incorporate live acute stroke encounters is ongoing.

scholarly journals Determinants of Adoption of New Technology in Telecom Sector: A Structural Equation Modeling Approach

2018 ◽  
Vol 20 (1) ◽  
pp. 166-178 ◽  
Author(s):  
Susmita Chatterjee ◽  
Bibek Ray Chaudhuri ◽  
Debabrata Dutta
Keyword(s):  
Structural Equation Modeling ◽  
Mobile Communications ◽  
Structural Equation ◽  
Low Cost ◽  
New Technology ◽  
Equation Modeling ◽  
Technology Standards ◽  
Technology Standard ◽  
The Usa ◽  
Adoption Of New Technology

In this article, we look at the determinants of the new technology adoption by consumers in the case of mobile telecommunications. The dynamic nature of the telecom industry is a result of the frequent technological change. Consumers witness different technology standards in mobile communications, starting from the first generation (1G) to second generation (2G) subsequently to third (3G) and now experiencing fourth (4G) in some countries such as Norway, Sweden, South Korea, and the USA including ours. The movement from one standard to the other has been predicted to be smooth as all of them are vertical substitutes for each other. Given the various dimensions such as price, requirements, utility and so on, these technology standards are not perfect substitutes. The article investigates the prospect of a new technology standard roll out in India. A survey of 400 mobile phone customers in metro telecom circles has been carried out for this purpose. The study applies structural equation modeling (SEM) and explores the adoption intention of this new technology among the respondents. Results show that the presence of low-cost alternatives that is the availability of a lower technology standard poses a significant hurdle to the adoption of new technology services.

scholarly journals Circular polarization reconfigurable antenna for mid-band 5G applications with a new reconfigurable technique

2020 ◽  
Vol 19 (2) ◽  
pp. 802
Author(s):  
Alaa Imran AL-Muttairi ◽  
Malik Jasim Farhan
Keyword(s):  
Resonant Frequency ◽  
Circular Polarization ◽  
Low Cost ◽  
Axial Ratio ◽  
Maximum Size ◽  
Impedance Bandwidth ◽  
Reconfigurable Antenna ◽  
Commercial Software ◽  
Innovative Technique

In this paper, a novel low cost, single-feed, and circular polarization reconfigurable antenna is designed and fabricated for future mid-band 5G applications. An innovative technique is used in this approach, which combines three techniques, namely: polygon U-slot, switchable vertical or horizontal slots, and shorting posts. The proposed antenna can alter its polarization sense between RHCP and LHCP with the ability to adjust the axial ratio position with respect to frequency along the impedance bandwidth of the antenna. The antenna is built on RT/duroid 5880 substrate with a maximum size of (31*31*3.15) .Two real diodes are integrated across the slot to change polarization sense. CST commercial software is used to simulate the antenna, and then it is fabricated and measured practically. Good agreements between the two results are achieved. However, The antenna has impedance bandwidth starting from 3.4995GHz to 3.73GHz with overlapped axial ratio bandwidth of 2.1% for both operation senses. Also, the antenna has good gain, and it has one resonant frequency at 3.6GHz for both operating states.

scholarly journals Development of a Flexible, Extendable, and Low-Cost Control Unit for Surface Drifters

2017 ◽  
Vol 34 (3) ◽  
pp. 669-677
Author(s):  
Andrea Giudici ◽  
Tomas Torsvik ◽  
Tarmo Soomere
Keyword(s):  
Mobile Communications ◽  
Low Cost ◽  
Control Unit ◽  
Digital Data ◽  
Operational Testing ◽  
Small Footprint ◽  
Surface Drifters ◽  
Inland Water Bodies ◽  
To Receive ◽  
Further Development

AbstractAn extensible, low-cost drifter control unit (VELELLA) design is presented, developed for use in drifters that are deployed in inland water bodies or near-coast regions. The control unit is custom built from basic components built around a small footprint microcontroller, making use of a GPS receiver for position tracking, a Global System for Mobile Communications [Groupe SpécialMobile (GSM)] radio for data transmission, and two sensor buses to handle analog and digital data generated by an arbitrary array of external sensors. A cloud-based data collection platform has been implemented to receive and store data transmitted over general packet radio service (GPRS) from the drifter. The control unit was found to perform satisfactorily in operational testing, providing data at subhertz frequency for position and temperature during extended time. However, some issues related to temporary data loss and power consumption spikes were identified, indicating that some further development of the control unit is required to achieve a production-ready platform for extensive and prolonged field operations.

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