Article
Engineering, Electrical & Electronic
Lukas Berkelmann, Dirk Manteuffel
Summary: This study introduces a method for measuring the embedded effect of wearable and implanted antennas for on-body communications. It uses a tapered flat phantom to characterize the antenna's ability to excite body waves and expresses it in terms of angular gain. The design provides a large enough test zone for most wireless body area network devices while minimizing the required tissue-simulating materials. Validation and performance comparison indicate that this method is suitable for antenna design in on-body applications.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Engineering, Electrical & Electronic
Abhishek Kandwal, Jingzhen Li, Tobore Igbe, Yuhang Liu, Ranjan Das, Binod Kumar Kanaujia, Zedong Nie
Summary: This article proposes a high gain broadband higher order mode spoof surface plasmon leaky wave antenna sensor based on Young's double slit method, which is suitable for dual beam and sensing applications. It operates in a wide frequency range and provides high sensitivity and stable measurement results.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2022)
Article
Engineering, Electrical & Electronic
Zijian Shao, Yueping Zhang
Summary: This article introduces the design and advantages of coupled shorted patch antennas (CSPAs), which achieve dual-band operation by coupling TM0,1/2 modes and overcome the limitations of traditional shorted patch antennas (SPAs). CSPAs exhibit horizontally polarized broadside radiation and vertically polarized conical radiation patterns.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Computer Science, Information Systems
M. E. Diago-Mosquera, A. Aragon-Zavala, A. Rodrigues-Lopez, M. Rodriguez
Summary: This study conducted static measurements and research at 28 GHz and 60 GHz frequencies in an empty seating area of a stadium with a capacity of 60000 seats. The findings lay a good foundation for understanding mmWave channel propagation in a stadium. The sectorization approach and the Kriging-aided model were used to characterize path loss behavior and predict it at unmeasured locations.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Reza Aminzadeh, Arno Thielens, Maxim Zhadobov, Luc Martens, Wout Joseph
Summary: This article explores the experimental characterization of on-body propagation channels in different frequency bands, extracting channel parameters such as path gain and delay spread. The study demonstrates higher path gains for vertical and horizontal polarizations in the 900 MHz and 60 GHz bands, respectively. Additionally, the maximum mean excess delay and root-mean-square delay spread were found to decrease significantly in the 60 GHz band compared to the 900 MHz band.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Wankai Tang, Xiangyu Chen, Ming Zheng Chen, Jun Yan Dai, Yu Han, Marco Di Renzo, Shi Jin, Qiang Cheng, Tie Jun Cui
Summary: Reconfigurable intelligent surfaces (RISs) act as an interface between wireless propagation environments and information science. This paper presents a refined path loss model for RISs, simplifying it while maintaining accuracy. Experimental results confirm the effectiveness of the proposed model.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Lukas Berkelmann, Dirk Manteuffel
Summary: This article introduces a model for on-body propagation of antennas and redefines antenna parameters, allowing for educated antenna design without the need for electromagnetic modeling of the entire system. Through this approach, on-body antennas can be characterized for better performance.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Chow-Yen-Desmond Sim, Jayshri Kulkarni, Shr-Hua Wang, Shi-Ying Zheng, Zhi-Hao Lin, Shu-Chuan Chen
Summary: In this letter, a low-profile (3.5 mm) dual-band operation laptop antenna designed for wireless fidelity 6E (2.4/5/6 GHz) bands is proposed. The proposed antenna is a double-slit loaded modified inverted-L antenna (ILA) structure that can excite multifrequency mode, allowing it to fully cover the desired 5 and 6 GHz bands (5150-7125 MHz). To further cover the 2.4 GHz band (2400-2485 MHz), a C-shaped coupling strip is further printed behind the modified ILA. Besides exhibiting a small planar size of only 22.3 mm x 3.5 mm that allows it to be applied in a narrow screen bezel laptop, the proposed antenna can still yield desirable measured 10 dB bandwidths of 2.4-2.485 and 4.74-7.26 GHz, with good antenna efficiency of more than 40% and 61%, respectively.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Computer Science, Information Systems
Shibo He, Yuyi Sun, Yuan Wu, Mianxiong Dong, Zhiguo Shi
Summary: Wireless charging is a popular technology in IoT that eliminates the need for batteries in electronic devices. This article presents a wireless charging antenna design that extends the charging distance from 5 to 55 cm, achieving a ten-fold improvement compared to near-field commercial communication. The authors model the near-field signal propagation with higher-order factors and establish the relationship between geometry parameters and transmit power, utilizing a greedy search algorithm to optimize coil parameters and maximize charging distance.
IEEE INTERNET OF THINGS JOURNAL
(2023)
Article
Multidisciplinary Sciences
Ziqi Qu, Zhechen Zhu, Yulong Liu, Mengxia Yu, Terry Tao Ye
Summary: Conductive yarns have shown potential as a replacement for metallic wires in e-Textile devices. However, the parasitic capacitance induced by their micro-structure is not fully understood. This study proposes a model to analyze and quantify the parasitic elements of conductive yarns in air-core helical inductors. The results show that the parasitic capacitance of commercial conductive yarns ranges from 1 fF/cm to 3 fF/cm depending on the yarn's microstructure, providing valuable insights for the design and use of conductive yarns in e-textile devices.
NATURE COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Luoxing Zhang, Jianxing Li, Yanyang Wang, Sen Yan, Kai-Da Xu, Hung Luyen
Summary: A dual-band wearable button antenna for wireless body-area network applications is proposed, offering omnidirectional and broadside radiation patterns for on-body and off-body communications, respectively.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Xuejian Zhang, Ruisi He, Mi Yang, Bo Ai, Shaopeng Wang, Weiming Li, Wenpu Sun, Lizhe Li, Peng Huang, Yunlei Xue
Summary: The radio propagation characteristics in subway tunnels are essential for designing reliable wireless communications. Extensive propagation measurements were conducted at 1.8 and 5.8 GHz in a straight subway tunnel to obtain large-scale channel characteristics. Path loss, shadow fading, and channel correlation were extracted and modeled based on the measurements. The results provide valuable information for link budget, handover scheme design, and network planning of subway communication systems.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Computer Science, Information Systems
Bo Zhang, Wei Liu, Qiang Li, Yang Li, Xiaonan Zhao, Cuiping Zhang, Cheng Wang
Summary: This article introduces a new directional modulation design method that allows designers to choose the magnitudes of weight coefficients in advance using a convex iterative approach. Two design examples are presented to demonstrate the effectiveness of the proposed design, showing increased flexibility in the design process.
IEEE INTERNET OF THINGS JOURNAL
(2021)
Article
Computer Science, Information Systems
Kuo Liu, Ruipeng Liu, Wenjie Cui, Kanglong Zhang, Mengjun Wang, Chao Fan, Hongxing Zheng, Erping Li
Summary: This paper introduces a miniaturized, dual-resonant spiral antenna designed for wireless implantable capsule systems. By utilizing specific materials and design, the antenna achieves good performance and biocompatibility, making it suitable for use in such systems.
Article
Engineering, Electrical & Electronic
Huafeng Su, Yao Zhang, Lin Ling Wu, Jun-Hui Ou, Xiu Yin Zhang
Summary: To reduce mutual coupling in the triband wireless Wi-Fi router, a filtenna with nonresonant node (NRN) radiators and series-fed antennas is designed. The NRN filtering radiators incorporate NRN filtering circuits, achieving parallel resonance and radiation zero simultaneously. By manipulating the resonant frequency and radiation zero, the NRN filtering radiators are implemented, resulting in reduced mutual coupling and improved throughput of the router.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2023)
Article
Materials Science, Multidisciplinary
Zahra Atashi, Baharak Divband, Ahmad Keshtkar, Maasoumeh Khatamian, Farzane Farahmand-Zahed, Ali Kiani Nazarlo, Nahideh Gharehaghaji
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2017)
Article
Engineering, Biomedical
Arezoo Zakeri, Alireza Hokmabadi
BIOCYBERNETICS AND BIOMEDICAL ENGINEERING
(2018)
Article
Radiology, Nuclear Medicine & Medical Imaging
A. Keshtkar, Z. Salehnia, M. H. Somi, A. T. Eftekharsadat
PHYSICA MEDICA-EUROPEAN JOURNAL OF MEDICAL PHYSICS
(2012)
Article
Computer Science, Artificial Intelligence
Arezoo Zakeri, Alireza Hokmabadi
EXPERT SYSTEMS WITH APPLICATIONS
(2019)
Article
Optics
Saeideh Mohammadzadeh-Asl, Ayuob Aghanejad, Miguel de la Guardia, Jafar Ezzati Nazhad Dolatabadi, Ahmad Keshtkar
Summary: The study demonstrated that signal enhancement using SPR sensor can effectively measure small molecules and detect cancer cells by interacting with their overexpressed receptors.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Computer Science, Artificial Intelligence
Arezoo Zakeri, Alireza Hokmabadi, Nishant Ravikumar, Alejandro F. Frangi, Ali Gooya
Summary: Automatic shape anomaly detection in large-scale imaging data using a deep probabilistic model and recurrent encoder-decoder network is effective in screening suboptimal segmentations and pathologies. Experiments on two datasets demonstrate the versatility and effectiveness of the proposed method in sifting shape anomalies in cardiac imaging pipelines for further analysis.
MEDICAL IMAGE ANALYSIS
(2022)
Article
Medical Informatics
Mohammad Khosravi, Mahdad Esmaeili, Yalda Jabbari Moghaddam, Ahmad Keshtkar, Javad Jalili, Hamid Tayefi Nasrabadi
Summary: This study presents an automated machine learning method for classifying normal and abnormal mastoid air cells using CT images. By analyzing the characteristics of the CT images, a deep convolutional neural network is used to achieve automatic classification of mastoid air cells.
HEALTH AND TECHNOLOGY
(2022)
Article
Computer Science, Theory & Methods
Mohammad Khosravi, Yalda Jabbari Moghaddam, Mahdad Esmaeili, Ahmad Keshtkar, Javad Jalili, Hamid Tayefi Nasrabadi
Summary: Mastoid abnormalities in ear illnesses require new approaches due to lack of experts and low diagnostic accuracy. This paper introduces a deep learning-based method with high accuracy (87.80%) and speed for automatic analysis and classification of these abnormalities in the middle ear cavity.
JOURNAL OF BIG DATA
(2022)
Article
Cardiac & Cardiovascular Systems
Ali Kazemi, Ahmad Keshtkar, Saeid Rashidi, Naser Aslanabadi, Behrouz Khodadad, Mahdad Esmaeili, Elgar Enamzadeh
Summary: This study showed that cardiac fat tissues could be utilized as a trustworthy biomarker tool to predict the extent of CAD stenosis, with a significant linear correlation between coronary artery stenosis and cardiac fat volume.
IRANIAN HEART JOURNAL
(2021)
Article
Biochemistry & Molecular Biology
Saeideh Mohammadzadeh-Asl, Ayuob Aghanejad, Reza Yekta, Miguel de la Guardia, Jafar Ezzati Nazhad Dolatabadi, Ahmad Keshtkar
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2020)
Article
Radiology, Nuclear Medicine & Medical Imaging
Ali Kazemi, Ahmad Keshtkar, Saeid Rashidi, Naser Aslanabadi, Behrouz Khodadad, Mahdad Esmaeili
BIOMEDICAL PHYSICS & ENGINEERING EXPRESS
(2020)
Article
Reproductive Biology
Elham Mansouri, Ahmad Keshtkar, Amir Afshin Khaki, Arash Khaki
INTERNATIONAL JOURNAL OF WOMENS HEALTH AND REPRODUCTION SCIENCES
(2016)
Proceedings Paper
Engineering, Electrical & Electronic
M. Sajjad Bayati, Asghar Keshtkar, Farshad Khosravi, Ahmad Keshtkar
2012 16TH INTERNATIONAL SYMPOSIUM ON ELECTROMAGNETIC LAUNCH TECHNOLOGY (EML)
(2012)
