[paper] Metamaterial for Wearable Applications

Kabir Hossain^1,2, Thennarasan Sabapathy^1,2, Muzammil Jusoh^1,2, Ping Jack Soh1^1,2 Ainur Fasihah Mohd Fazilah^1,2, Ahmad Ashraf Abdul Halim^1,2, N. S. Raghava³, Symon K. Podilchak⁴, Dominique Schreurs⁵, Qammer H. Abbasi⁶

ENG and NZRI Characteristics of Decagonal Shaped Metamaterial for Wearable Applications

International Conference on UK-China Emerging Technologies 

UCET, Glasgow, United Kingdom, 2020, pp. 1-4, 

doi: 10.1109/UCET51115.2020.9205409

¹Advanced Communication Engineering (ACE) Centre of Excellence, Universiti Malaysia Perlis, No 15 & 17, Jalan Tiga, Pengkalan Jaya Business Centre, 01000 Kangar, Perlis, Malaysia. 

²School of Computer and Communication Engineering, Universiti Malaysia Perlis, Kampus Alam UniMAP Pauh Putra, Arau 02600, Malaysia 

³Departments of Electronics and Communication Engineering, Delhi Technological University, India
⁴Institute of Digital Communications, School of Engineering, University of Edinburgh, EH9 3FB, UK
⁵ESAT-TELEMIC Research Division, KU Leuven, Kasteelpark Arenberg 10 Box 2444, 3001 Leuven, Belgium 

⁶James Watt School of Engineering, University of Glasgow, UK

Abstract: A decagonal-shaped split ring resonator metamaterial based on a wearable or textile-based material is presented in this work. Analysis and comparison of various structure sizes are compared considering a compact 6×6 mm2 metamaterial unit cell, in particular, where robust transmissionreflection (RTR) and Nicolson-Ross-Weir (NRW) methods have been performed to extract the effective metamaterial parameters. An investigation based on the RTR method indicated an average bandwidth of 1.39 GHz with a near-zero refractive index (NZRI) and a 2.35 GHz bandwidth when considering epsilon negative (ENG) characteristics. On the other hand, for the NRW method, approximately 0.95 GHz of NZRI bandwidth and 2.46 GHz of ENG bandwidth have been observed, respectively. These results are also within the ultrawideband (UWB) frequency range, suggesting that the proposed unit cell structure is suitable for textile UWB antennas, biomedical sensors, related wearable systems, and other wireless body area network communication systems.

Fig: The real NZRI values obtained using the RTR and NRW methods for different unit cell structures: (a) 1 1 × array, (b) 2 1× array, (c) 1 2 × array, and (d) 2 2 × array

Acknowledgment: The author would like to acknowledge the support from the Fundamental Research Grant Scheme (FRGS) under a grant number of FRGS/1/2019/TK04/UNIMAP/02/3 from the Ministry of Education Malaysia.

[paper] X-Parameters Based Characterization and Compact Modeling of SiGe HBT Linearity

[paper] G. Niu, Anni Zhang, Yiao Li, Huaiyuan Zhang, Andries Scholten, Marnix Willemsen, Ralf Pijper and L.F. Tiemeijer; X-Parameters Based Characterization and Compact Modeling of SiGe HBT Linearity; ECS Transactions 2020, Volume 98, Number 5 https://t.co/PzJnIjkFC8 #semi pic.twitter.com/7IAIkqfPjF

— Wladek Grabinski (@wladek60) October 8, 2020

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from Twitter https://twitter.com/wladek60

October 08, 2020 at 05:22PM
via IFTTT

Special IJHSES Issue on Advancements in Smart Grid Technologies

International Journal of High Speed Electronics and Systems

ISSN (print): 0129-1564 | ISSN (online): 1793-6438

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Call for Papers

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Special Issue on Advancements in Smart Grid Technologies

This special issue is on electrical power generation, transmission, distribution and utilization in smart grid, from the viewpoints of individual power system elements and their integration, interaction and technological advancement.

The special issue focuses on microelectronic systems, circuits, power control and soft computing techniques in smart grid. It includes, but are not limited to, the following:

• Renewable & Sustainable Energy Technologies
• Cloud-assisted smart grid architectures and development
• Internet-centric smart grid solutions
• Case studies on recent advances in smart grid and renewable energy system
• Information and communication technology for enhancing smart grid and renewable energy system
• Future of renewable energy sources in environmental protection
• Sustainable computational methods to evaluate the optimization of renewable energy systems
• Networking and data mining in smart grids for continuous sustainable development
• Threat, challenges & opportunity of integrating smart grid and renewable energy system
• Generation techniques ranging from advances in conventional electromechanical methods, through nuclear power generation, to renewable energy generation.
• A study on the smart grid and renewable energy system for reducing the complexity of power grids
• Distribution techniques, equipment development, and smart grids.
• Renewable power generation and clean energy technologies
• Distributed energy resources and storage
• Modern power grid devices, sensors and wireless technologies

Paper Submission and Review Schedule:

• First announcement: October. 12th 2020
• Submission Deadline: November30th 2020
• Final notification: January 10, 2020
• Publication Date: June 30th 2020

Camera ready articles should be sent to the Guest Editor for consideration. Please specify the research topic on the cover page.

IJHSES Editor-in-Chiefs:
Michael Shur, Rensselaer Polytechnic Institute (USA)
Wladek Grabinski, MOS-AK (EU)

Guest Editor:
Naresh Kumar Yadav, D.C.R.U.S.T, Murthal (India)

[paper] Flexible MO TFT for Analog Applications

Giuseppe Cantarella¹, Júlio Costa², Tilo Meister³, Koichi Ishida³, Corrado Carta³, Frank Ellinger³, Paolo Lugli¹, Niko Münzenrieder^1,2 and Luisa Petti¹

Review of recent trends in flexible metal oxide thin-film transistors for analog applications

Flexible and Printed Electronics 2020, Vol. 5, No. 3

DOI: 10.1088/2058-8585/aba79a

¹Faculty of Science and Technology, Free University of Bozen-Bolzano, 39100, Bozen, Italy
²Flexible Electronics Laboratory, University of Sussex, Brighton, BN1 9QT, United Kingdom
³Chair of Circuit Design and Network Theory, TU Dresden, 01069 Dresden, Germany

Abstract: Thanks to the extraordinary advances flexible electronics have experienced over the last decades, applications such as conformable active-matrix displays, ubiquitously integrated disposable flexible sensor nodes, wearable or textile-integrated systems, as well as imperceptible and transient implants are now reachable. To enable these applications, specialized analog circuits able to transmit and receive data, condition sensors' parameters, drive actuators or control powering devices are required. High-performance sensor conditioning, driving and transceiver circuits on a wide range of flexible substrates are therefore extremely important to develop. However, the currently available materials and processes compatible with mechanically flexible substrates impose massive limitations in terms of large-area uniformity, device dimensions' shrinkability and circuit design, challenging the realization of flexible analog systems. Among state-of-the-art technologies employing low-temperature fabrication processes, thin-film transistors (TFTs) based on metal oxide semiconductors represent the potentially best compromise in terms of prize, performance, technology maturity and capacity to realize complex systems. This is why metal oxide TFTs are nowadays widely used for flexible, light-weight, transparent, stretchable and bio-degradable analog circuits and systems. Here, we review the current trends of flexible metal oxide TFTs for analog applications. First, an introduction is given, where current challenges and requirements related to the realization of flexible analog circuits and systems are analysed. Additionally, TFT performance parameters and configurations are briefly revised. Then, the recent advances in the field of flexible metal oxide TFTs for analog applications are summarized. In particular, all reported approaches to reduce the channel length and improve the AC performance are shown. Next, the current state of flexible metal oxide TFT-based analog circuits is shown, discussing n-type only and complementary circuit configurations. The last topic of the review covers systems based on flexible metal oxide analog circuits. Finally, a conclusion is drawn and an outlook over the field is provided.

Figure: Overview of published works on flexible metal oxide TFT based circuits, indicating the minimum channel length of the devices, the operation frequency of the circuits, the effective supply voltage used, as well as the total TFT count. Only integrated circuits are included.

Acknowledgments: This work was partially supported by the DFG FFlexCom Priority Programme, Germany, through projects WISDOM II and Coordination Funds, under Grants 271795180 and 270774198. This work was also partially funded with internal funding of the Faculty of Science and Technology of the Free University of Bolzano-Bozen (project ”EYRE” RTD Call 2019).

[paper] Parameter Extraction in JFETs

Nikolaos Makris¹, Matthias Bucher¹, Member, IEEE, Loukas Chevas¹, Farzan Jazaeri²

and Jean-Michel Sallese²

Free Carrier Mobility, Series Resistance, and Threshold Voltage Extraction
in Junction FETs

in IEEE Transactions on Electron Devices, 

Special Section on ESSDERC/ESSCIRC 2020

DOI: 10.1109/TED.2020.3025841.

¹School of Electrical and Computer Engineering, TU Crete (GR)

²Ecole Polytechnique Fédérale de Lausanne, EPFL (CH)

Abstract: In this brief, extraction methods are proposed for determining the essential parameters of double gate junction field-effect transistors (FETs). First, a novel method for determining free carrier effective mobility, similar to a recently proposed method for MOSFETs, is developed. The same method is then extended to cover also the case when series resistance is present, while series resistance itself may be determined from the measurement from two FETs with different channel lengths. The key technological and design parameter is the threshold voltage, which may be unambiguously determined from the transconductance-to-current ratio with a constant-current method. The new methods are shown to be effective over a wide range of technical parameters, using technology computer-aided design simulations.

Fig: Extraction of carrier mobility for DG JFETs in linear region at 300K 

a) corresponding output conductance gds and constituents ∂gds/∂Vds and 2Qsc,d/b, and 

b) extracted mobility for long- and moderate-length devices close agreement with the constant, nonfield-dependent mobility (μ = 826 cm2/Vs) used in the TCAD simulations.

Aknowlegement: This work was supported in part by the INNOVATION-EL-Crete Project under Grant MIS 5002772.