Review
Computer Science, Information Systems
Fatimah Fawzi Hashim, Wan Nor Liza Binti Mahadi, Tariq Bin Abdul Latef, Mohamadariff Bin Othman
Summary: The development of on-body antennas has become increasingly important in wireless technology, particularly for applications that require close contact with the human body. These antennas outperform normal antennas and have characteristics such as flexibility, reflection coefficient, bandwidth, directivity, gain, radiation, specific absorption rate (SAR), and efficiency. Improvements like band-gap structure and artificial magnetic conductors (AMC) and (DGS) have been incorporated to provide isolation from the human body and reduce SAR.
Article
Engineering, Multidisciplinary
Maruti Tamrakar, Usha Kiran Kommuri
Summary: The paper illustrates the use of QBTR structure as a metamaterial unitcell for metasurface characteristics analysis, showing that the QBTR metasurface can achieve an antenna gain of 5dBi within a specific frequency range.
SADHANA-ACADEMY PROCEEDINGS IN ENGINEERING SCIENCES
(2021)
Review
Chemistry, Analytical
Pradakshina Sharma, Shariq Suleman, Asim Farooqui, Wajid Ali, Jagriti Narang, Shweta J. Malode, Nagaraj P. Shetti
Summary: This article introduces the diagnosis strategies for Ebola virus and the use of advanced technologies such as artificial intelligence and the internet of medical things for disease diagnosis. Timely disease identification and treatment optimization are crucial for controlling infectious disease outbreaks.
MICROCHEMICAL JOURNAL
(2022)
Article
Engineering, Electrical & Electronic
Hossein Malekpoor, Mehdi Hamidkhani
Summary: A low profile printed slot antenna backed by broadband stacked artificial magnetic conductor (AMC) is introduced in this study. By inserting the stacked AMC surface into the antenna, improved radiation efficiency, size reduction, enhanced bandwidth, and excellent impedance matching are achieved, with uni-directional radiation patterns.
INTERNATIONAL JOURNAL OF MICROWAVE AND WIRELESS TECHNOLOGIES
(2023)
Article
Engineering, Electrical & Electronic
Hossein Malekpoor, Ali Abolmasoumi, Mehdi Hamidkhani
Summary: This paper introduces a low-profile printed dipole antenna backed by a broadband Giuseppe Peano fractal artificial magnetic conductor for wireless communications. The antenna shows wide bandwidth and good performance, with the AMC leading to size reduction, gain enhancement, and improved impedance matching compared to antennas without AMC.
IET MICROWAVES ANTENNAS & PROPAGATION
(2022)
Article
Engineering, Electrical & Electronic
Hossein Malekpoor, Mojtaba Shahraki
Summary: This study introduces a low profile printed slot antenna backed by broadband planar artificial magnetic conductor (AMC) to improve radiation efficiency and bandwidth. Compared to the antenna without AMC, the suggested antenna with AMC exhibits a smaller size, enhanced bandwidth, and excellent impedance matching with uni-directional radiation patterns.
JOURNAL OF COMMUNICATIONS TECHNOLOGY AND ELECTRONICS
(2022)
Article
Mathematics
Abhijit Pant, Rajendra Prasad Pant, Wutiphol Sintunavarat
Summary: The paper presents a new fixed point theorem which offers a solution to Rhoades' problem on the existence of contractive mappings with discontinuity at the fixed point, providing the first Meir-Keeler type solution to this issue. The theorem is shown to characterize the completeness of the metric space, and the structure of complete subspaces of the real line in which contractive mappings do not have discontinuity at the fixed point is also given. This resolves Rhoades' question completely in the context of the real line.
REVISTA DE LA REAL ACADEMIA DE CIENCIAS EXACTAS FISICAS Y NATURALES SERIE A-MATEMATICAS
(2021)
Article
Engineering, Electrical & Electronic
Hossein Malekpoor
Summary: A low profile four-element MIMO array of printed dipole antenna (PDA) backed by second iteration of Giuseppe Peano fractal artificial magnetic conductor (AMC) is introduced for broadband wireless communications. This array shows a -10 dB measured impedance bandwidth from 4.21 to 7.06 GHz (50.61%) for WLAN and WiMAX applications. The proposed MIMO array loaded by 6 x 6 AMC reflector achieves broad bandwidths, enhanced gains, and high isolations for MIMO systems.
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
(2023)
Article
Computer Science, Information Systems
Hossein Malekpoor, Mehdi Hamidkhani
Summary: A low-profile printed dipole antenna (PDA) backed by broadband rhomboid artificial magnetic conductor (AMC) is introduced for vehicular wireless communications. By inserting the suggested rhomboid AMC reflector into the PDA, improved radiation efficiency and expanded bandwidth are achieved. Compared to the PDA without AMC, the suggested PDA with AMC exhibits size reduction, enhanced gain, and excellent impedance matching.
Article
Computer Science, Information Systems
Adel Y. I. Ashyap, Samsul Haimi Bin Dahlan, Zuhairiah Zainal Abidin, Sharul Kamal Abdul Rahim, Huda A. Majid, Abdulrahman S. M. Alqadami, Mohamed El Atrash
Summary: The integrated design of high-impedance surface (HIS) and antenna for wearable applications is aimed at protecting the human body from harmful radiation and maintaining good performance. By using HIS, the antenna achieves robustness and efficiency for body loading and deformation, showing excellent performance.
Review
Biochemistry & Molecular Biology
Michal Kaleta, Jana Oklestkova, Ondrej Novak, Miroslav Strnad
Summary: Neuroactive steroids are a family of compounds that can affect nervous system functions, synthesized in either the nervous system or peripheral endocrine tissues. Monitoring the production and levels of neuroactive steroids can be beneficial for the prevention, diagnosis, monitoring, and treatment of neurodegenerative and psychiatric diseases. Immunoanalytical methods and chromatography combined with mass spectrometry are highlighted as relevant techniques for analyzing neuroactive steroids.
Review
Plant Sciences
Andrzej Patyra, Malgorzata Koltun-Jasion, Oktawia Jakubiak, Anna Karolina Kiss
Summary: Lignans are natural polyphenols with various pharmacological activities, including antimicrobial, anti-inflammatory, hypoglycemic, and cytoprotective effects. They have been found to be associated with a reduced risk of hormone-dependent cancers. Therefore, the extraction, purification, and analysis methods of lignans are crucial in pharmaceutical research.
Review
Chemistry, Analytical
Isabel Barbosa, Fernando Ramos, Rui M. Barbosa, Catia Domingues
Summary: This review provides a comprehensive overview of the determination of amatoxins, focusing on sample preparation and the importance of liquid chromatography coupled to mass spectrometry.
JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
(2023)
Review
Chemistry, Analytical
Joao Flavio da Silveira Petruci, Diandra Nunes Barreto, Mariana A. Dias, Erika P. Felix, Arnaldo A. Cardoso
Summary: Ground-level ozone is increasing worldwide due to anthropogenic emissions and the use of ozone generators. This poses risks to public health, indoor air quality, and materials. Monitoring and control policies are essential, but determining ozone gas remains a challenge. Advances in measurement techniques have been made, but further exploration is needed for device construction and components active towards ozone.
TRAC-TRENDS IN ANALYTICAL CHEMISTRY
(2022)
Review
Chemistry, Multidisciplinary
Yuki Komoto, Jiho Ryu, Masateru Taniguchi
Summary: Single-molecule measurements of single-molecule conductance between metal nanogap electrodes have been actively investigated for various applications. The advantage of rapid data acquisition through repeated breaking and forming of junctions outweighs the disadvantage of fluctuating and unreliable conductance. Machine learning-based analysis has greatly improved the analysis of single-molecule measurements, enabling detection and identification at the single-molecule level.
CHEMICAL COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Stefan Varault, Michel Soiron, Andre Barka, Anne Claire Lepage, Xavier Begaud
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2017)
Article
Chemistry, Physical
Xavier Begaud, Anne Claire Lepage, Stefan Varault, Michel Soiron, Andre Barka
Article
Materials Science, Multidisciplinary
Olivier Rance, Anne-Claire Lepage, Xavier Begaud, Michel Soiron, Andre Barka, Patrick Parneix
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2019)
Article
Chemistry, Multidisciplinary
Olivier Rance, Anne Claire Lepage, Xavier Begaud, Kevin Elis, Nicolas Capet
APPLIED SCIENCES-BASEL
(2019)
Article
Engineering, Electrical & Electronic
Rafael Goncalves Licursi de Mello, Anne Claire Lepage, Xavier Begaud
Summary: The bow-tie antenna is a simple planar shape with wideband input impedance, making it suitable for various wideband applications. However, its radiation pattern is not stable and the gain in the broadside direction deteriorates with increasing frequencies. This article thoroughly investigates the operation and performance of both triangular and rounded-edge versions of the bow-tie antenna and presents a technique to maximize performance by inserting radially aligned grooves in the radiators' ends. Simulation and measurement results show that this technique improves the bandwidth and increases the broadside gain without significant change in the radiation patterns and reflection coefficient magnitude.
IET MICROWAVES ANTENNAS & PROPAGATION
(2022)
Article
Chemistry, Analytical
Rafael Goncalves Licursi de Mello, Anne Claire Lepage, Xavier Begaud
Summary: This study designs a low-profile, triple-band, and wideband directive antenna by exploiting the expected in-band and out-of-band behaviors of a dual-band artificial magnetic conductor (AMC) reflector. The methodology is validated with a prototype suitable for 4G/5G and Wi-Fi 2.4/5/6E standards, achieving high gain, good front-to-back ratio, low cross-polarization level, and stable beamwidth within each band.
Article
Multidisciplinary Sciences
Rafael Goncalves Licursi de Mello, Anne Claire Lepage, Xavier Begaud
Summary: Metasurfaces are artificial materials that provide unique properties for interacting with acoustic, elastodynamic, or electromagnetic waves. In the field of Electromagnetics, metasurfaces enable specific functions for antennas, particularly in the multiband operation. This study presents the conditions for obtaining directive, multiband antennas by using two parallel metasurfaces surrounding a planar radiating element, showing that the functionalities of metasurfaces can be effectively utilized in a single design. The findings are validated through a compact 5G/4G/Wi-Fi 2.4/5/6E device that demonstrates beam steering in the 5G band while maintaining the radiation patterns of other bands.
SCIENTIFIC REPORTS
(2023)
Article
Engineering, Electrical & Electronic
Pedro Mendes Ruiz, Xavier Begaud, Francois Magne, Etienne Leder, Antoine Khy
Summary: This paper presents the design and implementation of four linear arrays of microstrip rectangular patch antennas. These arrays are used as part of a passive radar system for detecting UAVs using signals from 4G base stations. The arrays have been validated and operate within the frequency range of 2.62 GHz to 2.69 GHz, with a HPBW of 82 degrees in the H-plane and a maximal gain ranging from 11.1 dB to 12.2 dB in the required bandwidth, with a cosecant squared pattern in the E-plane.
ADVANCED ELECTROMAGNETICS
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Xavier Begaud, Anne Claire Lepage, Olivier Rance, Michel Soiron, Andre Barka, Sarah Laybros
Summary: This contribution presents a method to realize and measure a metamaterial absorber by optimizing the absorbing material and the overall structure. By using RF materials and fiber reinforced materials, the absorber achieves a low magnitude of reflection coefficient within a certain frequency range.
2022 INTERNATIONAL WORKSHOP ON ANTENNA TECHNOLOGY (IWAT)
(2022)
Proceedings Paper
Computer Science, Information Systems
Mohamed Abdelbasset Aliouane, Jean-Marc Conrat, Jean-Christophe Cousin, Xavier Begaud
Summary: This study aims to extend the existing knowledge on wave-material interaction by providing reflection measurements from 2 to 170 GHz, bridging the gap between frequencies below and above 100 GHz.
2022 JOINT EUROPEAN CONFERENCE ON NETWORKS AND COMMUNICATIONS & 6G SUMMIT (EUCNC/6G SUMMIT)
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Mohamed Abdelbasset Aliouane, Jean-Marc Conrat, Jean-Cristophe Cousin, Xavier Begaud
Summary: This paper presents the transmission measurements of typical indoor materials from 2 GHz to 170 GHz, aiming to understand and compare the interaction between waves and materials above and below 100 GHz frequencies.
2022 16TH EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION (EUCAP)
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Claudio Paoloni, Francois Magne, Frederic Andre, Joel Willebois, Quang Trung Le, Xavier Begaud, Giacomo Ulisse, Viktor Krozer, Rosa Letizia, Marc Marilier, Antonio Ramirez, Ralph Zimmerman
2018 EUROPEAN CONFERENCE ON NETWORKS AND COMMUNICATIONS (EUCNC)
(2018)
Proceedings Paper
Engineering, Electrical & Electronic
Taguhi Chalumyan, Olivier Maas, Xavier Begaud, Bernard Huyart
2017 11TH EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION (EUCAP)
(2017)
Article
Materials Science, Multidisciplinary
Chetan Joshi, Anne Claire Lepage, Xavier Begaud
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2017)
Proceedings Paper
Engineering, Electrical & Electronic
Claudio Paoloni, Francois Magne, Frederic Andre, Xavier Begaud, Juvelino Da Silva, Viktor Krozer, Marc Marilier, Antonio Ramirez, Ruth Vilar, Ralph Zimmerman
PROCEEDINGS OF 2016 IEEE 9TH UK-EUROPE-CHINA WORKSHOP ON MILLIMETRE WAVES AND TERAHERTZ TECHNOLOGIES (UCMMT)
(2016)
